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Network Working Group S. Waldbusser
Request for Comments: 1757 Carnegie Mellon University
Obsoletes: 1271 February 1995
Category: Standards Track
Remote Network Monitoring Management Information Base
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Abstract
This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols in TCP/IP-based internets.
In particular, it defines objects for managing remote network
monitoring devices.
Table of Contents
1. The Network Management Framework ...................... 2
2. Overview .............................................. 3
2.1 Remote Network Management Goals ...................... 3
2.2 Textual Conventions .................................. 5
2.3 Structure of MIB ..................................... 5
2.3.1 The Ethernet Statistics Group ...................... 6
2.3.2 The History Control Group .......................... 6
2.3.3 The Ethernet History Group ......................... 6
2.3.4 The Alarm Group .................................... 6
2.3.5 The Host Group ..................................... 6
2.3.6 The HostTopN Group ................................. 7
2.3.7 The Matrix Group ................................... 7
2.3.8 The Filter Group ................................... 7
2.3.9 The Packet Capture Group ........................... 7
2.3.10 The Event Group ................................... 7
3. Control of Remote Network Monitoring Devices .......... 7
3.1 Resource Sharing Among Multiple Management Stations .. 8
3.2 Row Addition Among Multiple Management Stations ...... 10
4. Conventions ........................................... 11
5. Definitions ........................................... 11
6. Acknowledgments ....................................... 89
7. References ............................................ 89
8. Security Considerations ............................... 90
Waldbusser [Page 1]
RFC 1757 Remote Network Monitoring MIB February 1995
9. Author's Address ...................................... 90
10. Appendix: Changes from RFC 1271 ...................... 91
1. The Network Management Framework
The Internet-standard Network Management Framework consists of three
components. They are:
STD 16, RFC 1155 [1] which defines the SMI, the mechanisms used
for describing and naming objects for the purpose of management.
STD 16, RFC 1212 [2] defines a more concise description mechanism,
which is wholly consistent with the SMI.
STD 17, RFC 1213 [3] which defines MIB-II, the core set of managed
objects for the Internet suite of protocols.
STD 15, RFC 1157 [4] which defines the SNMP, the protocol used for
network access to managed objects.
The Framework permits new objects to be defined for the purpose of
experimentation and evaluation.
Managed objects are accessed via a virtual information store, termed
the Management Information Base or MIB. Within a given MIB module,
objects are defined using RFC 1212's OBJECT-TYPE macro. At a
minimum, each object has a name, a syntax, an access-level, and an
implementation-status.
The name is an object identifier, an administratively assigned name,
which specifies an object type. The object type together with an
object instance serves to uniquely identify a specific instantiation
of the object. For human convenience, we often use a textual string,
termed the object descriptor, to also refer to the object type.
The syntax of an object type defines the abstract data structure
corresponding to that object type. The ASN.1[5] language is used for
this purpose. However, RFC 1155 purposely restricts the ASN.1
constructs which may be used. These restrictions are explicitly made
for simplicity.
The access-level of an object type defines whether it makes "protocol
sense" to read and/or write the value of an instance of the object
type. (This access-level is independent of any administrative
authorization policy.)
The implementation-status of an object type indicates whether the
object is mandatory, optional, obsolete, or deprecated.
Waldbusser [Page 2]
RFC 1757 Remote Network Monitoring MIB February 1995
2. Overview
Remote network monitoring devices, often called monitors or probes,
are instruments that exist for the purpose of managing a network.
Often these remote probes are stand-alone devices and devote
significant internal resources for the sole purpose of managing a
network. An organization may employ many of these devices, one per
network segment, to manage its internet. In addition, these devices
may be used for a network management service provider to access a
client network, often geographically remote.
The objects defined in this document are intended as an interface
between an RMON agent and an RMON management application and are not
intended for direct manipulation by humans. While some users may
tolerate the direct display of some of these objects, few will
tolerate the complexity of manually manipulating objects to
accomplish row creation. These functions should be handled by the
management application.
While most of the objects in this document are suitable for the
management of any type of network, there are some which are specific
to managing Ethernet networks. These are the objects in the
etherStatsTable, the etherHistoryTable, and some attributes of the
filterPktStatus and capturBufferPacketStatus objects. The design of
this MIB allows similar objects to be defined for other network
types. It is intended that future versions of this document and
additional documents will define extensions for other network types
such as Token Ring and FDDI.
2.1. Remote Network Management Goals
o Offline Operation
There are sometimes conditions when a management
station will not be in constant contact with its
remote monitoring devices. This is sometimes by
design in an attempt to lower communications costs
(especially when communicating over a WAN or
dialup link), or by accident as network failures
affect the communications between the management
station and the probe.
For this reason, this MIB allows a probe to be
configured to perform diagnostics and to collect
statistics continuously, even when communication with
the management station may not be possible or
efficient. The probe may then attempt to notify
the management station when an exceptional condition
occurs. Thus, even in circumstances where
Waldbusser [Page 3]
RFC 1757 Remote Network Monitoring MIB February 1995
communication between management station and probe is
not continuous, fault, performance, and configuration
information may be continuously accumulated and
communicated to the management station conveniently
and efficiently.
o Proactive Monitoring
Given the resources available on the monitor, it
is potentially helpful for it continuously to run
diagnostics and to log network performance. The
monitor is always available at the onset of any
failure. It can notify the management station of the
failure and can store historical statistical
information about the failure. This historical
information can be played back by the management
station in an attempt to perform further diagnosis
into the cause of the problem.
o Problem Detection and Reporting
The monitor can be configured to recognize
conditions, most notably error conditions, and
continuously to check for them. When one of these
conditions occurs, the event may be logged, and
management stations may be notified in a number of
ways.
o Value Added Data
Because a remote monitoring device represents a
network resource dedicated exclusively to network
management functions, and because it is located
directly on the monitored portion of the network, the
remote network monitoring device has the opportunity
to add significant value to the data it collects.
For instance, by highlighting those hosts on the
network that generate the most traffic or errors, the
probe can give the management station precisely the
information it needs to solve a class of problems.
o Multiple Managers
An organization may have multiple management stations
for different units of the organization, for different
functions (e.g. engineering and operations), and in an
attempt to provide disaster recovery. Because
environments with multiple management stations are
common, the remote network monitoring device has to
deal with more than own management station,
potentially using its resources concurrently.
Waldbusser [Page 4]
RFC 1757 Remote Network Monitoring MIB February 1995
2.2. Textual Conventions
Two new data types are introduced as a textual convention in this MIB
document. These textual conventions enhance the readability of the
specification and can ease comparison with other specifications if
appropriate. It should be noted that the introduction of the these
textual conventions has no effect on either the syntax nor the
semantics of any managed objects. The use of these is merely an
artifact of the explanatory method used. Objects defined in terms of
one of these methods are always encoded by means of the rules that
define the primitive type. Hence, no changes to the SMI or the SNMP
are necessary to accommodate these textual conventions which are
adopted merely for the convenience of readers and writers in pursuit
of the elusive goal of clear, concise, and unambiguous MIB documents.
The new data types are: OwnerString and EntryStatus.
2.3. Structure of MIB
The objects are arranged into the following groups:
- ethernet statistics
- history control
- ethernet history
- alarm
- host
- hostTopN
- matrix
- filter
- packet capture
- event
These groups are the basic unit of conformance. If a remote
monitoring device implements a group, then it must implement all
objects in that group. For example, a managed agent that implements
the host group must implement the hostControlTable, the hostTable and
the hostTimeTable.
Waldbusser [Page 5]
RFC 1757 Remote Network Monitoring MIB February 1995
All groups in this MIB are optional. Implementations of this MIB
must also implement the system and interfaces group of MIB-II [6].
MIB-II may also mandate the implementation of additional groups.
These groups are defined to provide a means of assigning object
identifiers, and to provide a method for managed agents to know which
objects they must implement.
2.3.1. The Ethernet Statistics Group
The ethernet statistics group contains statistics measured by the
probe for each monitored Ethernet interface on this device. This
group consists of the etherStatsTable. In the future other groups
will be defined for other media types including Token Ring and FDDI.
These groups should follow the same model as the ethernet statistics
group.
2.3.2. The History Control Group
The history control group controls the periodic statistical sampling
of data from various types of networks. This group consists of the
historyControlTable.
2.3.3. The Ethernet History Group
The ethernet history group records periodic statistical samples from
an ethernet network and stores them for later retrieval. This group
consists of the etherHistoryTable. In the future, other groups will
be defined for other media types including Token Ring and FDDI.
2.3.4. The Alarm Group
The alarm group periodically takes statistical samples from variables
in the probe and compares them to previously configured thresholds.
If the monitored variable crosses a threshold, an event is generated.
A hysteresis mechanism is implemented to limit the generation of
alarms. This group consists of the alarmTable and requires the
implementation of the event group.
2.3.5. The Host Group
The host group contains statistics associated with each host
discovered on the network. This group discovers hosts on the network
by keeping a list of source and destination MAC Addresses seen in
good packets promiscuously received from the network. This group
consists of the hostControlTable, the hostTable, and the
hostTimeTable.
Waldbusser [Page 6]
RFC 1757 Remote Network Monitoring MIB February 1995
2.3.6. The HostTopN Group
The hostTopN group is used to prepare reports that describe the hosts
that top a list ordered by one of their statistics. The available
statistics are samples of one of their base statistics over an
interval specified by the management station. Thus, these statistics
are rate based. The management station also selects how many such
hosts are reported. This group consists of the hostTopNControlTable
and the hostTopNTable, and requires the implementation of the host
group.
2.3.7. The Matrix Group
The matrix group stores statistics for conversations between sets of
two addresses. As the device detects a new conversation, it creates
a new entry in its tables. This group consists of the
matrixControlTable, the matrixSDTable and the matrixDSTable.
2.3.8. The Filter Group
The filter group allows packets to be matched by a filter equation.
These matched packets form a data stream that may be captured or may
generate events. This group consists of the filterTable and the
channelTable.
2.3.9. The Packet Capture Group
The Packet Capture group allows packets to be captured after they
flow through a channel. This group consists of the
bufferControlTable and the captureBufferTable, and requires the
implementation of the filter group.
2.3.10. The Event Group
The event group controls the generation and notification of events
from this device. This group consists of the eventTable and the
logTable.
3. Control of Remote Network Monitoring Devices
Due to the complex nature of the available functions in these
devices, the functions often need user configuration. In many cases,
the function requires parameters to be set up for a data collection
operation. The operation can proceed only after these parameters are
fully set up.
Waldbusser [Page 7]
RFC 1757 Remote Network Monitoring MIB February 1995
Many functional groups in this MIB have one or more tables in which
to set up control parameters, and one or more data tables in which to
place the results of the operation. The control tables are typically
read-write in nature, while the data tables are typically read-only.
Because the parameters in the control table often describe resulting
data in the data table, many of the parameters can be modified only
when the control entry is invalid. Thus, the method for modifying
these parameters is to invalidate the control entry, causing its
deletion and the deletion of any associated data entries, and then
create a new control entry with the proper parameters. Deleting the
control entry also gives a convenient method for reclaiming the
resources used by the associated data.
Some objects in this MIB provide a mechanism to execute an action on
the remote monitoring device. These objects may execute an action as
a result of a change in the state of the object. For those objects
in this MIB, a request to set an object to the same value as it
currently holds would thus cause no action to occur.
To facilitate control by multiple managers, resources have to be
shared among the managers. These resources are typically the memory
and computation resources that a function requires.
3.1. Resource Sharing Among Multiple Management Stations
When multiple management stations wish to use functions that compete
for a finite amount of resources on a device, a method to facilitate
this sharing of resources is required. Potential conflicts include:
o Two management stations wish to simultaneously use
resources that together would exceed the capability of
the device.
o A management station uses a significant amount of
resources for a long period of time.
o A management station uses resources and then crashes,
forgetting to free the resources so others may
use them.
A mechanism is provided for each management station initiated
function in this MIB to avoid these conflicts and to help resolve
them when they occur. Each function has a label identifying the
initiator (owner) of the function. This label is set by the
initiator to provide for the following possibilities:
o A management station may recognize resources it owns
and no longer needs.
o A network operator can find the management station that
owns the resource and negotiate for it to be freed.
Waldbusser [Page 8]
RFC 1757 Remote Network Monitoring MIB February 1995
o A network operator may decide to unilaterally free
resources another network operator has reserved.
o Upon initialization, a management station may recognize
resources it had reserved in the past. With this
information it may free the resources if it no longer
needs them.
Management stations and probes should support any format of the owner
string dictated by the local policy of the organization. It is
suggested that this name contain one or more of the following: IP
address, management station name, network manager's name, location,
or phone number. This information will help users to share the
resources more effectively.
There is often default functionality that the device or the
administrator of the probe (often the network administrator) wishes
to set up. The resources associated with this functionality are then
owned by the device itself or by the network administrator, and are
intended to be long-lived. In this case, the device or the
administrator will set the relevant owner object to a string starting
with 'monitor'. Indiscriminate modification of the monitor-owned
configuration by network management stations is discouraged. In
fact, a network management station should only modify these objects
under the direction of the administrator of the probe.
Resources on a probe are scarce and are typically allocated when
control rows are created by an application. Since many applications
may be using a probe simultaneously, indiscriminate allocation of
resources to particular applications is very likely to cause resource
shortages in the probe.
When a network management station wishes to utilize a function in a
monitor, it is encouraged to first scan the control table of that
function to find an instance with similar parameters to share. This
is especially true for those instances owned by the monitor, which
can be assumed to change infrequently. If a management station
decides to share an instance owned by another management station, it
should understand that the management station that owns the instance
may indiscriminately modify or delete it.
It should be noted that a management application should have the most
trust in a monitor-owned row because it should be changed very
infrequently. A row owned by the management application is less
long-lived because a network administrator is more likely to re-
assign resources from a row that is in use by one user than from a
monitor-owned row that is potentially in use by many users. A row
owned by another application would be even less long-lived because
the other application may delete or modify that row completely at its
Waldbusser [Page 9]
RFC 1757 Remote Network Monitoring MIB February 1995
discretion.
3.2. Row Addition Among Multiple Management Stations
The addition of new rows is achieved using the method described in
RFC 1212 [9]. In this MIB, rows are often added to a table in order
to configure a function. This configuration usually involves
parameters that control the operation of the function. The agent
must check these parameters to make sure they are appropriate given
restrictions defined in this MIB as well as any implementation
specific restrictions such as lack of resources. The agent
implementor may be confused as to when to check these parameters and
when to signal to the management station that the parameters are
invalid. There are two opportunities:
o When the management station sets each parameter object.
o When the management station sets the entry status object
to valid.
If the latter is chosen, it would be unclear to the management
station which of the several parameters was invalid and caused the
badValue error to be emitted. Thus, wherever possible, the
implementor should choose the former as it will provide more
information to the management station.
A problem can arise when multiple management stations attempt to set
configuration information simultaneously using SNMP. When this
involves the addition of a new conceptual row in the same control
table, the managers may collide, attempting to create the same entry.
To guard against these collisions, each such control entry contains a
status object with special semantics that help to arbitrate among the
managers. If an attempt is made with the row addition mechanism to
create such a status object and that object already exists, an error
is returned. When more than one manager simultaneously attempts to
create the same conceptual row, only the first will succeed. The
others will receive an error.
When a manager wishes to create a new control entry, it needs to
choose an index for that row. It may choose this index in a variety
of ways, hopefully minimizing the chances that the index is in use by
another manager. If the index is in use, the mechanism mentioned
previously will guard against collisions. Examples of schemes to
choose index values include random selection or scanning the control
table looking for the first unused index. Because index values may
be any valid value in the range and they are chosen by the manager,
the agent must allow a row to be created with any unused index value
if it has the resources to create a new row.
Waldbusser [Page 10]
RFC 1757 Remote Network Monitoring MIB February 1995
Some tables in this MIB reference other tables within this MIB. When
creating or deleting entries in these tables, it is generally
allowable for dangling references to exist. There is no defined
order for creating or deleting entries in these tables.
4. Conventions
The following conventions are used throughout the RMON MIB and its
companion documents.
Good Packets
Good packets are error-free packets that have a valid frame length.
For example, on Ethernet, good packets are error-free packets that
are between 64 octets long and 1518 octets long. They follow the
form defined in IEEE 802.3 section 3.2.all.
Bad Packets
Bad packets are packets that have proper framing and are therefore
recognized as packets, but contain errors within the packet or have
an invalid length. For example, on Ethernet, bad packets have a
valid preamble and SFD, but have a bad CRC, or are either shorter
than 64 octets or longer than 1518 octets.
5. Definitions
RMON-MIB DEFINITIONS ::= BEGIN
IMPORTS
Counter FROM RFC1155-SMI
DisplayString FROM RFC1158-MIB
mib-2 FROM RFC1213-MIB
OBJECT-TYPE FROM RFC-1212
TRAP-TYPE FROM RFC-1215;
-- Remote Network Monitoring MIB
rmon OBJECT IDENTIFIER ::= { mib-2 16 }
-- textual conventions
OwnerString ::= DisplayString
-- This data type is used to model an administratively
-- assigned name of the owner of a resource. This
-- information is taken from the NVT ASCII character
-- set. It is suggested that this name contain one or
Waldbusser [Page 11]
RFC 1757 Remote Network Monitoring MIB February 1995
-- more of the following: IP address, management station
-- name, network manager's name, location, or phone
-- number.
-- In some cases the agent itself will be the owner of
-- an entry. In these cases, this string shall be set
-- to a string starting with 'monitor'.
--
-- SNMP access control is articulated entirely in terms
-- of the contents of MIB views; access to a particular
-- SNMP object instance depends only upon its presence
-- or absence in a particular MIB view and never upon
-- its value or the value of related object instances.
-- Thus, objects of this type afford resolution of
-- resource contention only among cooperating managers;
-- they realize no access control function with respect
-- to uncooperative parties.
--
-- By convention, objects with this syntax are declared as
-- having
--
-- SIZE (0..127)
EntryStatus ::= INTEGER
{ valid(1),
createRequest(2),
underCreation(3),
invalid(4)
}
-- The status of a table entry.
--
-- Setting this object to the value invalid(4) has the
-- effect of invalidating the corresponding entry.
-- That is, it effectively disassociates the mapping
-- identified with said entry.
-- It is an implementation-specific matter as to whether
-- the agent removes an invalidated entry from the table.
-- Accordingly, management stations must be prepared to
-- receive tabular information from agents that
-- corresponds to entries currently not in use. Proper
-- interpretation of such entries requires examination
-- of the relevant EntryStatus object.
--
-- An existing instance of this object cannot be set to
-- createRequest(2). This object may only be set to
-- createRequest(2) when this instance is created. When
-- this object is created, the agent may wish to create
-- supplemental object instances with default values
-- to complete a conceptual row in this table. Because
Waldbusser [Page 12]
RFC 1757 Remote Network Monitoring MIB February 1995
-- the creation of these default objects is entirely at
-- the option of the agent, the manager must not assume
-- that any will be created, but may make use of any that
-- are created. Immediately after completing the create
-- operation, the agent must set this object to
-- underCreation(3).
--
-- When in the underCreation(3) state, an entry is
-- allowed to exist in a possibly incomplete, possibly
-- inconsistent state, usually to allow it to be
-- modified in mutiple PDUs. When in this state, an
-- entry is not fully active. Entries shall exist in
-- the underCreation(3) state until the management
-- station is finished configuring the entry and sets
-- this object to valid(1) or aborts, setting this
-- object to invalid(4). If the agent determines that
-- an entry has been in the underCreation(3) state for
-- an abnormally long time, it may decide that the
-- management station has crashed. If the agent makes
-- this decision, it may set this object to invalid(4)
-- to reclaim the entry. A prudent agent will
-- understand that the management station may need to
-- wait for human input and will allow for that
-- possibility in its determination of this abnormally
-- long period.
--
-- An entry in the valid(1) state is fully configured and
-- consistent and fully represents the configuration or
-- operation such a row is intended to represent. For
-- example, it could be a statistical function that is
-- configured and active, or a filter that is available
-- in the list of filters processed by the packet capture
-- process.
--
-- A manager is restricted to changing the state of an
-- entry in the following ways:
--
-- create under
-- To: valid Request Creation invalid
-- From:
-- valid OK NO OK OK
-- createRequest N/A N/A N/A N/A
-- underCreation OK NO OK OK
-- invalid NO NO NO OK
-- nonExistent NO OK NO OK
--
-- In the table above, it is not applicable to move the
-- state from the createRequest state to any other
Waldbusser [Page 13]
RFC 1757 Remote Network Monitoring MIB February 1995
-- state because the manager will never find the
-- variable in that state. The nonExistent state is
-- not a value of the enumeration, rather it means that
-- the entryStatus variable does not exist at all.
--
-- An agent may allow an entryStatus variable to change
-- state in additional ways, so long as the semantics
-- of the states are followed. This allowance is made
-- to ease the implementation of the agent and is made
-- despite the fact that managers should never
-- excercise these additional state transitions.
statistics OBJECT IDENTIFIER ::= { rmon 1 }
history OBJECT IDENTIFIER ::= { rmon 2 }
alarm OBJECT IDENTIFIER ::= { rmon 3 }
hosts OBJECT IDENTIFIER ::= { rmon 4 }
hostTopN OBJECT IDENTIFIER ::= { rmon 5 }
matrix OBJECT IDENTIFIER ::= { rmon 6 }
filter OBJECT IDENTIFIER ::= { rmon 7 }
capture OBJECT IDENTIFIER ::= { rmon 8 }
event OBJECT IDENTIFIER ::= { rmon 9 }
-- The Ethernet Statistics Group
--
-- Implementation of the Ethernet Statistics group is
-- optional.
--
-- The ethernet statistics group contains statistics
-- measured by the probe for each monitored interface on
-- this device. These statistics take the form of free
-- running counters that start from zero when a valid entry
-- is created.
--
-- This group currently has statistics defined only for
-- Ethernet interfaces. Each etherStatsEntry contains
-- statistics for one Ethernet interface. The probe must
-- create one etherStats entry for each monitored Ethernet
-- interface on the device.
etherStatsTable OBJECT-TYPE
SYNTAX SEQUENCE OF EtherStatsEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of Ethernet statistics entries."
::= { statistics 1 }
Waldbusser [Page 14]
RFC 1757 Remote Network Monitoring MIB February 1995
etherStatsEntry OBJECT-TYPE
SYNTAX EtherStatsEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A collection of statistics kept for a particular
Ethernet interface. As an example, an instance of the
etherStatsPkts object might be named etherStatsPkts.1"
INDEX { etherStatsIndex }
::= { etherStatsTable 1 }
EtherStatsEntry ::= SEQUENCE {
etherStatsIndex INTEGER (1..65535),
etherStatsDataSource OBJECT IDENTIFIER,
etherStatsDropEvents Counter,
etherStatsOctets Counter,
etherStatsPkts Counter,
etherStatsBroadcastPkts Counter,
etherStatsMulticastPkts Counter,
etherStatsCRCAlignErrors Counter,
etherStatsUndersizePkts Counter,
etherStatsOversizePkts Counter,
etherStatsFragments Counter,
etherStatsJabbers Counter,
etherStatsCollisions Counter,
etherStatsPkts64Octets Counter,
etherStatsPkts65to127Octets Counter,
etherStatsPkts128to255Octets Counter,
etherStatsPkts256to511Octets Counter,
etherStatsPkts512to1023Octets Counter,
etherStatsPkts1024to1518Octets Counter,
etherStatsOwner OwnerString,
etherStatsStatus EntryStatus
}
etherStatsIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The value of this object uniquely identifies this
etherStats entry."
::= { etherStatsEntry 1 }
etherStatsDataSource OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
ACCESS read-write
STATUS mandatory
Waldbusser [Page 15]
RFC 1757 Remote Network Monitoring MIB February 1995
DESCRIPTION
"This object identifies the source of the data that
this etherStats entry is configured to analyze. This
source can be any ethernet interface on this device.
In order to identify a particular interface, this
object shall identify the instance of the ifIndex
object, defined in RFC 1213 and RFC 1573 [4,6], for
the desired interface. For example, if an entry
were to receive data from interface #1, this object
would be set to ifIndex.1.
The statistics in this group reflect all packets
on the local network segment attached to the
identified interface.
An agent may or may not be able to tell if
fundamental changes to the media of the interface
have occurred and necessitate an invalidation of
this entry. For example, a hot-pluggable ethernet
card could be pulled out and replaced by a
token-ring card. In such a case, if the agent has
such knowledge of the change, it is recommended that
it invalidate this entry.
This object may not be modified if the associated
etherStatsStatus object is equal to valid(1)."
::= { etherStatsEntry 2 }
etherStatsDropEvents OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of events in which packets
were dropped by the probe due to lack of resources.
Note that this number is not necessarily the number of
packets dropped; it is just the number of times this
condition has been detected."
::= { etherStatsEntry 3 }
etherStatsOctets OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of octets of data (including
those in bad packets) received on the
network (excluding framing bits but including
Waldbusser [Page 16]
RFC 1757 Remote Network Monitoring MIB February 1995
FCS octets).
This object can be used as a reasonable estimate of
ethernet utilization. If greater precision is
desired, the etherStatsPkts and etherStatsOctets
objects should be sampled before and after a common
interval. The differences in the sampled values are
Pkts and Octets, respectively, and the number of
seconds in the interval is Interval. These values
are used to calculate the Utilization as follows:
Pkts * (9.6 + 6.4) + (Octets * .8)
Utilization = -------------------------------------
Interval * 10,000
The result of this equation is the value Utilization
which is the percent utilization of the ethernet
segment on a scale of 0 to 100 percent."
::= { etherStatsEntry 4 }
etherStatsPkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of packets (including bad packets,
broadcast packets, and multicast packets) received."
::= { etherStatsEntry 5 }
etherStatsBroadcastPkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of good packets received that were
directed to the broadcast address. Note that this
does not include multicast packets."
::= { etherStatsEntry 6 }
etherStatsMulticastPkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of good packets received that were
directed to a multicast address. Note that this
number does not include packets directed to the
broadcast address."
Waldbusser [Page 17]
RFC 1757 Remote Network Monitoring MIB February 1995
::= { etherStatsEntry 7 }
etherStatsCRCAlignErrors OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of packets received that
had a length (excluding framing bits, but
including FCS octets) of between 64 and 1518
octets, inclusive, but but had either a bad
Frame Check Sequence (FCS) with an integral
number of octets (FCS Error) or a bad FCS with
a non-integral number of octets (Alignment Error)."
::= { etherStatsEntry 8 }
etherStatsUndersizePkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of packets received that were
less than 64 octets long (excluding framing bits,
but including FCS octets) and were otherwise well
formed."
::= { etherStatsEntry 9 }
etherStatsOversizePkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of packets received that were
longer than 1518 octets (excluding framing bits,
but including FCS octets) and were otherwise
well formed."
::= { etherStatsEntry 10 }
etherStatsFragments OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of packets received that were less
than 64 octets in length (excluding framing bits but
including FCS octets) and had either a bad Frame
Check Sequence (FCS) with an integral number of
octets (FCS Error) or a bad FCS with a non-integral
Waldbusser [Page 18]
RFC 1757 Remote Network Monitoring MIB February 1995
number of octets (Alignment Error).
Note that it is entirely normal for
etherStatsFragments to increment. This is because
it counts both runts (which are normal occurrences
due to collisions) and noise hits."
::= { etherStatsEntry 11 }
etherStatsJabbers OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of packets received that were
longer than 1518 octets (excluding framing bits,
but including FCS octets), and had either a bad
Frame Check Sequence (FCS) with an integral number
of octets (FCS Error) or a bad FCS with a
non-integral number of octets (Alignment Error).
Note that this definition of jabber is different
than the definition in IEEE-802.3 section 8.2.1.5
(10BASE5) and section 10.3.1.4 (10BASE2). These
documents define jabber as the condition where any
packet exceeds 20 ms. The allowed range to detect
jabber is between 20 ms and 150 ms."
::= { etherStatsEntry 12 }
etherStatsCollisions OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The best estimate of the total number of collisions
on this Ethernet segment.
The value returned will depend on the location of
the RMON probe. Section 8.2.1.3 (10BASE-5) and
section 10.3.1.3 (10BASE-2) of IEEE standard 802.3
states that a station must detect a collision, in
the receive mode, if three or more stations are
transmitting simultaneously. A repeater port must
detect a collision when two or more stations are
transmitting simultaneously. Thus a probe placed on
a repeater port could record more collisions than a
probe connected to a station on the same segment
would.
Waldbusser [Page 19]
RFC 1757 Remote Network Monitoring MIB February 1995
Probe location plays a much smaller role when
considering 10BASE-T. 14.2.1.4 (10BASE-T) of IEEE
standard 802.3 defines a collision as the
simultaneous presence of signals on the DO and RD
circuits (transmitting and receiving at the same
time). A 10BASE-T station can only detect
collisions when it is transmitting. Thus probes
placed on a station and a repeater, should report
the same number of collisions.
Note also that an RMON probe inside a repeater
should ideally report collisions between the
repeater and one or more other hosts (transmit
collisions as defined by IEEE 802.3k) plus receiver
collisions observed on any coax segments to which
the repeater is connected."
::= { etherStatsEntry 13 }
etherStatsPkts64Octets OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of packets (including bad
packets) received that were 64 octets in length
(excluding framing bits but including FCS octets)."
::= { etherStatsEntry 14 }
etherStatsPkts65to127Octets OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of packets (including bad
packets) received that were between
65 and 127 octets in length inclusive
(excluding framing bits but including FCS octets)."
::= { etherStatsEntry 15 }
etherStatsPkts128to255Octets OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of packets (including bad
packets) received that were between
128 and 255 octets in length inclusive
(excluding framing bits but including FCS octets)."
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RFC 1757 Remote Network Monitoring MIB February 1995
::= { etherStatsEntry 16 }
etherStatsPkts256to511Octets OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of packets (including bad
packets) received that were between
256 and 511 octets in length inclusive
(excluding framing bits but including FCS octets)."
::= { etherStatsEntry 17 }
etherStatsPkts512to1023Octets OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of packets (including bad
packets) received that were between
512 and 1023 octets in length inclusive
(excluding framing bits but including FCS octets)."
::= { etherStatsEntry 18 }
etherStatsPkts1024to1518Octets OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of packets (including bad
packets) received that were between
1024 and 1518 octets in length inclusive
(excluding framing bits but including FCS octets)."
::= { etherStatsEntry 19 }
etherStatsOwner OBJECT-TYPE
SYNTAX OwnerString
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The entity that configured this entry and is
therefore using the resources assigned to it."
::= { etherStatsEntry 20 }
etherStatsStatus OBJECT-TYPE
SYNTAX EntryStatus
ACCESS read-write
STATUS mandatory
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RFC 1757 Remote Network Monitoring MIB February 1995
DESCRIPTION
"The status of this etherStats entry."
::= { etherStatsEntry 21 }
-- The History Control Group
-- Implementation of the History Control group is optional.
--
-- The history control group controls the periodic statistical
-- sampling of data from various types of networks. The
-- historyControlTable stores configuration entries that each
-- define an interface, polling period, and other parameters.
-- Once samples are taken, their data is stored in an entry
-- in a media-specific table. Each such entry defines one
-- sample, and is associated with the historyControlEntry that
-- caused the sample to be taken. Each counter in the
-- etherHistoryEntry counts the same event as its
-- similarly-named counterpart in the etherStatsEntry,
-- except that each value here is a cumulative sum during a
-- sampling period.
--
-- If the probe keeps track of the time of day, it should
-- start the first sample of the history at a time such that
-- when the next hour of the day begins, a sample is
-- started at that instant. This tends to make more
-- user-friendly reports, and enables comparison of reports
-- from different probes that have relatively accurate time
-- of day.
--
-- The probe is encouraged to add two history control entries
-- per monitored interface upon initialization that describe
-- a short term and a long term polling period. Suggested
-- parameters are 30 seconds for the short term polling period
-- and 30 minutes for the long term period.
historyControlTable OBJECT-TYPE
SYNTAX SEQUENCE OF HistoryControlEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of history control entries."
::= { history 1 }
historyControlEntry OBJECT-TYPE
SYNTAX HistoryControlEntry
ACCESS not-accessible
STATUS mandatory
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RFC 1757 Remote Network Monitoring MIB February 1995
DESCRIPTION
"A list of parameters that set up a periodic sampling
of statistics. As an example, an instance of the
historyControlInterval object might be named
historyControlInterval.2"
INDEX { historyControlIndex }
::= { historyControlTable 1 }
HistoryControlEntry ::= SEQUENCE {
historyControlIndex INTEGER (1..65535),
historyControlDataSource OBJECT IDENTIFIER,
historyControlBucketsRequested INTEGER (1..65535),
historyControlBucketsGranted INTEGER (1..65535),
historyControlInterval INTEGER (1..3600),
historyControlOwner OwnerString,
historyControlStatus EntryStatus
}
historyControlIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"An index that uniquely identifies an entry in the
historyControl table. Each such entry defines a
set of samples at a particular interval for an
interface on the device."
::= { historyControlEntry 1 }
historyControlDataSource OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
ACCESS read-write
STATUS mandatory
DESCRIPTION
"This object identifies the source of the data for
which historical data was collected and
placed in a media-specific table on behalf of this
historyControlEntry. This source can be any
interface on this device. In order to identify
a particular interface, this object shall identify
the instance of the ifIndex object, defined
in RFC 1213 and RFC 1573 [4,6], for the desired
interface. For example, if an entry were to receive
data from interface #1, this object would be set
to ifIndex.1.
The statistics in this group reflect all packets
on the local network segment attached to the
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RFC 1757 Remote Network Monitoring MIB February 1995
identified interface.
An agent may or may not be able to tell if fundamental
changes to the media of the interface have occurred
and necessitate an invalidation of this entry. For
example, a hot-pluggable ethernet card could be
pulled out and replaced by a token-ring card. In
such a case, if the agent has such knowledge of the
change, it is recommended that it invalidate this
entry.
This object may not be modified if the associated
historyControlStatus object is equal to valid(1)."
::= { historyControlEntry 2 }
historyControlBucketsRequested OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The requested number of discrete time intervals
over which data is to be saved in the part of the
media-specific table associated with this
historyControlEntry.
When this object is created or modified, the probe
should set historyControlBucketsGranted as closely to
this object as is possible for the particular probe
implementation and available resources."
DEFVAL { 50 }
::= { historyControlEntry 3 }
historyControlBucketsGranted OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of discrete sampling intervals
over which data shall be saved in the part of
the media-specific table associated with this
historyControlEntry.
When the associated historyControlBucketsRequested
object is created or modified, the probe
should set this object as closely to the requested
value as is possible for the particular
probe implementation and available resources. The
probe must not lower this value except as a result
Waldbusser [Page 24]
RFC 1757 Remote Network Monitoring MIB February 1995
of a modification to the associated
historyControlBucketsRequested object.
There will be times when the actual number of
buckets associated with this entry is less than
the value of this object. In this case, at the
end of each sampling interval, a new bucket will
be added to the media-specific table.
When the number of buckets reaches the value of
this object and a new bucket is to be added to the
media-specific table, the oldest bucket associated
with this historyControlEntry shall be deleted by
the agent so that the new bucket can be added.
When the value of this object changes to a value less
than the current value, entries are deleted
from the media-specific table associated with this
historyControlEntry. Enough of the oldest of these
entries shall be deleted by the agent so that their
number remains less than or equal to the new value of
this object.
When the value of this object changes to a value
greater than the current value, the number of
associated media- specific entries may be allowed to
grow."
::= { historyControlEntry 4 }
historyControlInterval OBJECT-TYPE
SYNTAX INTEGER (1..3600)
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The interval in seconds over which the data is
sampled for each bucket in the part of the
media-specific table associated with this
historyControlEntry. This interval can
be set to any number of seconds between 1 and
3600 (1 hour).
Because the counters in a bucket may overflow at their
maximum value with no indication, a prudent manager
will take into account the possibility of overflow
in any of the associated counters. It is important
to consider the minimum time in which any counter
could overflow on a particular media type and set
the historyControlInterval object to a value less
Waldbusser [Page 25]
RFC 1757 Remote Network Monitoring MIB February 1995
than this interval. This is typically most
important for the 'octets' counter in any
media-specific table. For example, on an Ethernet
network, the etherHistoryOctets counter could
overflow in about one hour at the Ethernet's maximum
utilization.
This object may not be modified if the associated
historyControlStatus object is equal to valid(1)."
DEFVAL { 1800 }
::= { historyControlEntry 5 }
historyControlOwner OBJECT-TYPE
SYNTAX OwnerString
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The entity that configured this entry and is
therefore using the resources assigned to it."
::= { historyControlEntry 6 }
historyControlStatus OBJECT-TYPE
SYNTAX EntryStatus
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The status of this historyControl entry.
Each instance of the media-specific table associated
with this historyControlEntry will be deleted by the
agent if this historyControlEntry is not equal to
valid(1)."
::= { historyControlEntry 7 }
-- The Ethernet History Group
-- Implementation of the Ethernet History group is optional.
--
-- The Ethernet History group records periodic
-- statistical samples from a network and stores them
-- for later retrieval. Once samples are taken, their
-- data is stored in an entry in a media-specific
-- table. Each such entry defines one sample, and is
-- associated with the historyControlEntry that caused
-- the sample to be taken. This group defines the
-- etherHistoryTable, for Ethernet networks.
--
Waldbusser [Page 26]
RFC 1757 Remote Network Monitoring MIB February 1995
etherHistoryTable OBJECT-TYPE
SYNTAX SEQUENCE OF EtherHistoryEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of Ethernet history entries."
::= { history 2 }
etherHistoryEntry OBJECT-TYPE
SYNTAX EtherHistoryEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"An historical sample of Ethernet statistics on a
particular Ethernet interface. This sample is
associated with the historyControlEntry which set up
the parameters for a regular collection of these
samples. As an example, an instance of the
etherHistoryPkts object might be named
etherHistoryPkts.2.89"
INDEX { etherHistoryIndex , etherHistorySampleIndex }
::= { etherHistoryTable 1 }
EtherHistoryEntry ::= SEQUENCE {
etherHistoryIndex INTEGER (1..65535),
etherHistorySampleIndex INTEGER (1..2147483647),
etherHistoryIntervalStart TimeTicks,
etherHistoryDropEvents Counter,
etherHistoryOctets Counter,
etherHistoryPkts Counter,
etherHistoryBroadcastPkts Counter,
etherHistoryMulticastPkts Counter,
etherHistoryCRCAlignErrors Counter,
etherHistoryUndersizePkts Counter,
etherHistoryOversizePkts Counter,
etherHistoryFragments Counter,
etherHistoryJabbers Counter,
etherHistoryCollisions Counter,
etherHistoryUtilization INTEGER (0..10000)
}
etherHistoryIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The history of which this entry is a part. The
history identified by a particular value of this
Waldbusser [Page 27]
RFC 1757 Remote Network Monitoring MIB February 1995
index is the same history as identified
by the same value of historyControlIndex."
::= { etherHistoryEntry 1 }
etherHistorySampleIndex OBJECT-TYPE
SYNTAX INTEGER (1..2147483647)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"An index that uniquely identifies the particular
sample this entry represents among all samples
associated with the same historyControlEntry.
This index starts at 1 and increases by one
as each new sample is taken."
::= { etherHistoryEntry 2 }
etherHistoryIntervalStart OBJECT-TYPE
SYNTAX TimeTicks
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The value of sysUpTime at the start of the interval
over which this sample was measured. If the probe
keeps track of the time of day, it should start
the first sample of the history at a time such that
when the next hour of the day begins, a sample is
started at that instant. Note that following this
rule may require the probe to delay collecting the
first sample of the history, as each sample must be
of the same interval. Also note that the sample which
is currently being collected is not accessible in this
table until the end of its interval."
::= { etherHistoryEntry 3 }
etherHistoryDropEvents OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of events in which packets
were dropped by the probe due to lack of resources
during this sampling interval. Note that this number
is not necessarily the number of packets dropped, it
is just the number of times this condition has been
detected."
::= { etherHistoryEntry 4 }
etherHistoryOctets OBJECT-TYPE
Waldbusser [Page 28]
RFC 1757 Remote Network Monitoring MIB February 1995
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of octets of data (including
those in bad packets) received on the
network (excluding framing bits but including
FCS octets)."
::= { etherHistoryEntry 5 }
etherHistoryPkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of packets (including bad packets)
received during this sampling interval."
::= { etherHistoryEntry 6 }
etherHistoryBroadcastPkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of good packets received during this
sampling interval that were directed to the
broadcast address."
::= { etherHistoryEntry 7 }
etherHistoryMulticastPkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of good packets received during this
sampling interval that were directed to a
multicast address. Note that this number does not
include packets addressed to the broadcast address."
::= { etherHistoryEntry 8 }
etherHistoryCRCAlignErrors OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of packets received during this sampling
interval that had a length (excluding framing bits
but including FCS octets) between 64 and 1518
Waldbusser [Page 29]
RFC 1757 Remote Network Monitoring MIB February 1995
octets, inclusive, but had either a bad Frame Check
Sequence (FCS) with an integral number of octets
(FCS Error) or a bad FCS with a non-integral number
of octets (Alignment Error)."
::= { etherHistoryEntry 9 }
etherHistoryUndersizePkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of packets received during this
sampling interval that were less than 64 octets
long (excluding framing bits but including FCS
octets) and were otherwise well formed."
::= { etherHistoryEntry 10 }
etherHistoryOversizePkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of packets received during this
sampling interval that were longer than 1518
octets (excluding framing bits but including
FCS octets) but were otherwise well formed."
::= { etherHistoryEntry 11 }
etherHistoryFragments OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The total number of packets received during this
sampling interval that were less than 64 octets in
length (excluding framing bits but including FCS
octets) had either a bad Frame Check Sequence (FCS)
with an integral number of octets (FCS Error) or a bad
FCS with a non-integral number of octets (Alignment
Error).
Note that it is entirely normal for
etherHistoryFragments to increment. This is because
it counts both runts (which are normal occurrences
due to collisions) and noise hits."
::= { etherHistoryEntry 12 }
etherHistoryJabbers OBJECT-TYPE
Waldbusser [Page 30]
RFC 1757 Remote Network Monitoring MIB February 1995
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of packets received during this
sampling interval that were longer than 1518 octets
(excluding framing bits but including FCS octets),
and had either a bad Frame Check Sequence (FCS)
with an integral number of octets (FCS Error) or
a bad FCS with a non-integral number of octets
(Alignment Error).
Note that this definition of jabber is different
than the definition in IEEE-802.3 section 8.2.1.5
(10BASE5) and section 10.3.1.4 (10BASE2). These
documents define jabber as the condition where any
packet exceeds 20 ms. The allowed range to detect
jabber is between 20 ms and 150 ms."
::= { etherHistoryEntry 13 }
etherHistoryCollisions OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The best estimate of the total number of collisions
on this Ethernet segment during this sampling
interval.
The value returned will depend on the location of
the RMON probe. Section 8.2.1.3 (10BASE-5) and
section 10.3.1.3 (10BASE-2) of IEEE standard 802.3
states that a station must detect a collision, in
the receive mode, if three or more stations are
transmitting simultaneously. A repeater port must
detect a collision when two or more stations are
transmitting simultaneously. Thus a probe placed on
a repeater port could record more collisions than a
probe connected to a station on the same segment
would.
Probe location plays a much smaller role when
considering 10BASE-T. 14.2.1.4 (10BASE-T) of IEEE
standard 802.3 defines a collision as the
simultaneous presence of signals on the DO and RD
circuits (transmitting and receiving at the same
time). A 10BASE-T station can only detect
collisions when it is transmitting. Thus probes
Waldbusser [Page 31]
RFC 1757 Remote Network Monitoring MIB February 1995
placed on a station and a repeater, should report
the same number of collisions.
Note also that an RMON probe inside a repeater
should ideally report collisions between the
repeater and one or more other hosts (transmit
collisions as defined by IEEE 802.3k) plus receiver
collisions observed on any coax segments to which
the repeater is connected."
::= { etherHistoryEntry 14 }
etherHistoryUtilization OBJECT-TYPE
SYNTAX INTEGER (0..10000)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The best estimate of the mean physical layer
network utilization on this interface during this
sampling interval, in hundredths of a percent."
::= { etherHistoryEntry 15 }
-- The Alarm Group
-- Implementation of the Alarm group is optional.
--
-- The Alarm Group requires the implementation of the Event
-- group.
--
-- The Alarm group periodically takes
-- statistical samples from variables in the probe and
-- compares them to thresholds that have been
-- configured. The alarm table stores configuration
-- entries that each define a variable, polling period,
-- and threshold parameters. If a sample is found to
-- cross the threshold values, an event is generated.
-- Only variables that resolve to an ASN.1 primitive
-- type of INTEGER (INTEGER, Counter, Gauge, or
-- TimeTicks) may be monitored in this way.
--
-- This function has a hysteresis mechanism to limit
-- the generation of events. This mechanism generates
-- one event as a threshold is crossed in the
-- appropriate direction. No more events are generated
-- for that threshold until the opposite threshold is
-- crossed.
--
-- In the case of a sampling a deltaValue, a probe may
Waldbusser [Page 32]
RFC 1757 Remote Network Monitoring MIB February 1995
-- implement this mechanism with more precision if it
-- takes a delta sample twice per period, each time
-- comparing the sum of the latest two samples to the
-- threshold. This allows the detection of threshold
-- crossings that span the sampling boundary. Note
-- that this does not require any special configuration
-- of the threshold value. It is suggested that probes
-- implement this more precise algorithm.
alarmTable OBJECT-TYPE
SYNTAX SEQUENCE OF AlarmEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of alarm entries."
::= { alarm 1 }
alarmEntry OBJECT-TYPE
SYNTAX AlarmEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of parameters that set up a periodic checking
for alarm conditions. For example, an instance of the
alarmValue object might be named alarmValue.8"
INDEX { alarmIndex }
::= { alarmTable 1 }
AlarmEntry ::= SEQUENCE {
alarmIndex INTEGER (1..65535),
alarmInterval INTEGER,
alarmVariable OBJECT IDENTIFIER,
alarmSampleType INTEGER,
alarmValue INTEGER,
alarmStartupAlarm INTEGER,
alarmRisingThreshold INTEGER,
alarmFallingThreshold INTEGER,
alarmRisingEventIndex INTEGER (0..65535),
alarmFallingEventIndex INTEGER (0..65535),
alarmOwner OwnerString,
alarmStatus EntryStatus
}
alarmIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
Waldbusser [Page 33]
RFC 1757 Remote Network Monitoring MIB February 1995
"An index that uniquely identifies an entry in the
alarm table. Each such entry defines a
diagnostic sample at a particular interval
for an object on the device."
::= { alarmEntry 1 }
alarmInterval OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The interval in seconds over which the data is
sampled and compared with the rising and falling
thresholds. When setting this variable, care
should be taken in the case of deltaValue
sampling - the interval should be set short enough
that the sampled variable is very unlikely to
increase or decrease by more than 2^31 - 1 during
a single sampling interval.
This object may not be modified if the associated
alarmStatus object is equal to valid(1)."
::= { alarmEntry 2 }
alarmVariable OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The object identifier of the particular variable to
be sampled. Only variables that resolve to an ASN.1
primitive type of INTEGER (INTEGER, Counter, Gauge,
or TimeTicks) may be sampled.
Because SNMP access control is articulated entirely
in terms of the contents of MIB views, no access
control mechanism exists that can restrict the value
of this object to identify only those objects that
exist in a particular MIB view. Because there is
thus no acceptable means of restricting the read
access that could be obtained through the alarm
mechanism, the probe must only grant write access to
this object in those views that have read access to
all objects on the probe.
During a set operation, if the supplied variable
name is not available in the selected MIB view, a
badValue error must be returned. If at any time the
Waldbusser [Page 34]
RFC 1757 Remote Network Monitoring MIB February 1995
variable name of an established alarmEntry is no
longer available in the selected MIB view, the probe
must change the status of this alarmEntry to
invalid(4).
This object may not be modified if the associated
alarmStatus object is equal to valid(1)."
::= { alarmEntry 3 }
alarmSampleType OBJECT-TYPE
SYNTAX INTEGER {
absoluteValue(1),
deltaValue(2)
}
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The method of sampling the selected variable and
calculating the value to be compared against the
thresholds. If the value of this object is
absoluteValue(1), the value of the selected variable
will be compared directly with the thresholds at the
end of the sampling interval. If the value of this
object is deltaValue(2), the value of the selected
variable at the last sample will be subtracted from
the current value, and the difference compared with
the thresholds.
This object may not be modified if the associated
alarmStatus object is equal to valid(1)."
::= { alarmEntry 4 }
alarmValue OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The value of the statistic during the last sampling
period. For example, if the sample type is
deltaValue, this value will be the difference
between the samples at the beginning and end of the
period. If the sample type is absoluteValue, this
value will be the sampled value at the end of the
period.
This is the value that is compared with the rising and
falling thresholds.
Waldbusser [Page 35]
RFC 1757 Remote Network Monitoring MIB February 1995
The value during the current sampling period is not
made available until the period is completed and will
remain available until the next period completes."
::= { alarmEntry 5 }
alarmStartupAlarm OBJECT-TYPE
SYNTAX INTEGER {
risingAlarm(1),
fallingAlarm(2),
risingOrFallingAlarm(3)
}
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The alarm that may be sent when this entry is first
set to valid. If the first sample after this entry
becomes valid is greater than or equal to the
risingThreshold and alarmStartupAlarm is equal to
risingAlarm(1) or risingOrFallingAlarm(3), then a
single rising alarm will be generated. If the first
sample after this entry becomes valid is less than
or equal to the fallingThreshold and
alarmStartupAlarm is equal to fallingAlarm(2) or
risingOrFallingAlarm(3), then a single falling alarm
will be generated.
This object may not be modified if the associated
alarmStatus object is equal to valid(1)."
::= { alarmEntry 6 }
alarmRisingThreshold OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-write
STATUS mandatory
DESCRIPTION
"A threshold for the sampled statistic. When the
current sampled value is greater than or equal to
this threshold, and the value at the last sampling
interval was less than this threshold, a single
event will be generated. A single event will also
be generated if the first sample after this entry
becomes valid is greater than or equal to this
threshold and the associated alarmStartupAlarm is
equal to risingAlarm(1) or risingOrFallingAlarm(3).
After a rising event is generated, another such event
will not be generated until the sampled value
falls below this threshold and reaches the
Waldbusser [Page 36]
RFC 1757 Remote Network Monitoring MIB February 1995
alarmFallingThreshold.
This object may not be modified if the associated
alarmStatus object is equal to valid(1)."
::= { alarmEntry 7 }
alarmFallingThreshold OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-write
STATUS mandatory
DESCRIPTION
"A threshold for the sampled statistic. When the
current sampled value is less than or equal to this
threshold, and the value at the last sampling
interval was greater than this threshold, a single
event will be generated. A single event will also
be generated if the first sample after this entry
becomes valid is less than or equal to this
threshold and the associated alarmStartupAlarm is
equal to fallingAlarm(2) or risingOrFallingAlarm(3).
After a falling event is generated, another such event
will not be generated until the sampled value
rises above this threshold and reaches the
alarmRisingThreshold.
This object may not be modified if the associated
alarmStatus object is equal to valid(1)."
::= { alarmEntry 8 }
alarmRisingEventIndex OBJECT-TYPE
SYNTAX INTEGER (0..65535)
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The index of the eventEntry that is
used when a rising threshold is crossed. The
eventEntry identified by a particular value of
this index is the same as identified by the same value
of the eventIndex object. If there is no
corresponding entry in the eventTable, then
no association exists. In particular, if this value
is zero, no associated event will be generated, as
zero is not a valid event index.
This object may not be modified if the associated
alarmStatus object is equal to valid(1)."
::= { alarmEntry 9 }
Waldbusser [Page 37]
RFC 1757 Remote Network Monitoring MIB February 1995
alarmFallingEventIndex OBJECT-TYPE
SYNTAX INTEGER (0..65535)
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The index of the eventEntry that is
used when a falling threshold is crossed. The
eventEntry identified by a particular value of
this index is the same as identified by the same value
of the eventIndex object. If there is no
corresponding entry in the eventTable, then
no association exists. In particular, if this value
is zero, no associated event will be generated, as
zero is not a valid event index.
This object may not be modified if the associated
alarmStatus object is equal to valid(1)."
::= { alarmEntry 10 }
alarmOwner OBJECT-TYPE
SYNTAX OwnerString
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The entity that configured this entry and is
therefore using the resources assigned to it."
::= { alarmEntry 11 }
alarmStatus OBJECT-TYPE
SYNTAX EntryStatus
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The status of this alarm entry."
::= { alarmEntry 12 }
-- The Host Group
-- Implementation of the Host group is optional.
--
-- The host group discovers new hosts on the network by
-- keeping a list of source and destination MAC Addresses seen
-- in good packets. For each of these addresses, the host
-- group keeps a set of statistics. The hostControlTable
-- controls which interfaces this function is performed on,
-- and contains some information about the process. On
-- behalf of each hostControlEntry, data is collected on an
Waldbusser [Page 38]
RFC 1757 Remote Network Monitoring MIB February 1995
-- interface and placed in both the hostTable and the
-- hostTimeTable. If the monitoring device finds itself
-- short of resources, it may delete entries as needed. It
-- is suggested that the device delete the least recently
-- used entries first.
-- The hostTable contains entries for each address
-- discovered on a particular interface. Each entry
-- contains statistical data about that host. This table is
-- indexed by the MAC address of the host, through which a
-- random access may be achieved.
-- The hostTimeTable contains data in the same format as the
-- hostTable, and must contain the same set of hosts, but is
-- indexed using hostTimeCreationOrder rather than
-- hostAddress.
-- The hostTimeCreationOrder is an integer which reflects
-- the relative order in which a particular entry was
-- discovered and thus inserted into the table. As this
-- order, and thus the index, is among those entries
-- currently in the table, the index for a particular entry
-- may change if an (earlier) entry is deleted. Thus the
-- association between hostTimeCreationOrder and
-- hostTimeEntry may be broken at any time.
-- The hostTimeTable has two important uses. The first is the
-- fast download of this potentially large table. Because the
-- index of this table runs from 1 to the size of the table,
-- inclusive, its values are predictable. This allows very
-- efficient packing of variables into SNMP PDU's and allows
-- a table transfer to have multiple packets outstanding.
-- These benefits increase transfer rates tremendously.
-- The second use of the hostTimeTable is the efficient
-- discovery by the management station of new entries added
-- to the table. After the management station has downloaded
-- the entire table, it knows that new entries will be added
-- immediately after the end of the current table. It can
-- thus detect new entries there and retrieve them easily.
-- Because the association between hostTimeCreationOrder and
-- hostTimeEntry may be broken at any time, the management
-- station must monitor the related hostControlLastDeleteTime
-- object. When the management station thus detects a
-- deletion, it must assume that any such associations have
--- been broken, and invalidate any it has stored locally.
-- This includes restarting any download of the
-- hostTimeTable that may have been in progress, as well as
Waldbusser [Page 39]
RFC 1757 Remote Network Monitoring MIB February 1995
-- rediscovering the end of the hostTimeTable so that it may
-- detect new entries. If the management station does not
-- detect the broken association, it may continue to refer
-- to a particular host by its creationOrder while
-- unwittingly retrieving the data associated with another
-- host entirely. If this happens while downloading the
-- host table, the management station may fail to download
-- all of the entries in the table.
hostControlTable OBJECT-TYPE
SYNTAX SEQUENCE OF HostControlEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of host table control entries."
::= { hosts 1 }
hostControlEntry OBJECT-TYPE
SYNTAX HostControlEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of parameters that set up the discovery of
hosts on a particular interface and the collection
of statistics about these hosts. For example, an
instance of the hostControlTableSize object might be
named hostControlTableSize.1"
INDEX { hostControlIndex }
::= { hostControlTable 1 }
HostControlEntry ::= SEQUENCE {
hostControlIndex INTEGER (1..65535),
hostControlDataSource OBJECT IDENTIFIER,
hostControlTableSize INTEGER,
hostControlLastDeleteTime TimeTicks,
hostControlOwner OwnerString,
hostControlStatus EntryStatus
}
hostControlIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"An index that uniquely identifies an entry in the
hostControl table. Each such entry defines
a function that discovers hosts on a particular
interface and places statistics about them in the
Waldbusser [Page 40]
RFC 1757 Remote Network Monitoring MIB February 1995
hostTable and the hostTimeTable on behalf of this
hostControlEntry."
::= { hostControlEntry 1 }
hostControlDataSource OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
ACCESS read-write
STATUS mandatory
DESCRIPTION
"This object identifies the source of the data for
this instance of the host function. This source
can be any interface on this device. In order
to identify a particular interface, this object shall
identify the instance of the ifIndex object, defined
in RFC 1213 and RFC 1573 [4,6], for the desired
interface. For example, if an entry were to receive
data from interface #1, this object would be set to
ifIndex.1.
The statistics in this group reflect all packets
on the local network segment attached to the
identified interface.
An agent may or may not be able to tell if
fundamental changes to the media of the interface
have occurred and necessitate an invalidation of
this entry. For example, a hot-pluggable ethernet
card could be pulled out and replaced by a
token-ring card. In such a case, if the agent has
such knowledge of the change, it is recommended that
it invalidate this entry.
This object may not be modified if the associated
hostControlStatus object is equal to valid(1)."
::= { hostControlEntry 2 }
hostControlTableSize OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of hostEntries in the hostTable and the
hostTimeTable associated with this hostControlEntry."
::= { hostControlEntry 3 }
hostControlLastDeleteTime OBJECT-TYPE
SYNTAX TimeTicks
ACCESS read-only
Waldbusser [Page 41]
RFC 1757 Remote Network Monitoring MIB February 1995
STATUS mandatory
DESCRIPTION
"The value of sysUpTime when the last entry
was deleted from the portion of the hostTable
associated with this hostControlEntry. If no
deletions have occurred, this value shall be zero."
::= { hostControlEntry 4 }
hostControlOwner OBJECT-TYPE
SYNTAX OwnerString
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The entity that configured this entry and is
therefore using the resources assigned to it."
::= { hostControlEntry 5 }
hostControlStatus OBJECT-TYPE
SYNTAX EntryStatus
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The status of this hostControl entry.
If this object is not equal to valid(1), all
associated entries in the hostTable, hostTimeTable,
and the hostTopNTable shall be deleted by the
agent."
::= { hostControlEntry 6 }
hostTable OBJECT-TYPE
SYNTAX SEQUENCE OF HostEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of host entries."
::= { hosts 2 }
hostEntry OBJECT-TYPE
SYNTAX HostEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A collection of statistics for a particular host
that has been discovered on an interface of this
device. For example, an instance of the
hostOutBroadcastPkts object might be named
hostOutBroadcastPkts.1.6.8.0.32.27.3.176"
Waldbusser [Page 42]
RFC 1757 Remote Network Monitoring MIB February 1995
INDEX { hostIndex, hostAddress }
::= { hostTable 1 }
HostEntry ::= SEQUENCE {
hostAddress OCTET STRING,
hostCreationOrder INTEGER (1..65535),
hostIndex INTEGER (1..65535),
hostInPkts Counter,
hostOutPkts Counter,
hostInOctets Counter,
hostOutOctets Counter,
hostOutErrors Counter,
hostOutBroadcastPkts Counter,
hostOutMulticastPkts Counter
}
hostAddress OBJECT-TYPE
SYNTAX OCTET STRING
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The physical address of this host."
::= { hostEntry 1 }
hostCreationOrder OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"An index that defines the relative ordering of
the creation time of hosts captured for a
particular hostControlEntry. This index shall
be between 1 and N, where N is the value of
the associated hostControlTableSize. The ordering
of the indexes is based on the order of each entry's
insertion into the table, in which entries added
earlier have a lower index value than entries added
later.
It is important to note that the order for a
particular entry may change as an (earlier) entry
is deleted from the table. Because this order may
change, management stations should make use of the
hostControlLastDeleteTime variable in the
hostControlEntry associated with the relevant
portion of the hostTable. By observing
this variable, the management station may detect
the circumstances where a previous association
Waldbusser [Page 43]
RFC 1757 Remote Network Monitoring MIB February 1995
between a value of hostCreationOrder
and a hostEntry may no longer hold."
::= { hostEntry 2 }
hostIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The set of collected host statistics of which
this entry is a part. The set of hosts
identified by a particular value of this
index is associated with the hostControlEntry
as identified by the same value of hostControlIndex."
::= { hostEntry 3 }
hostInPkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of good packets transmitted to this
address since it was added to the hostTable."
::= { hostEntry 4 }
hostOutPkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of packets, including bad packets,
transmitted by this address since it was added
to the hostTable."
::= { hostEntry 5 }
hostInOctets OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of octets transmitted to this address
since it was added to the hostTable (excluding
framing bits but including FCS octets), except for
those octets in bad packets."
::= { hostEntry 6 }
hostOutOctets OBJECT-TYPE
SYNTAX Counter
Waldbusser [Page 44]
RFC 1757 Remote Network Monitoring MIB February 1995
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of octets transmitted by this address
since it was added to the hostTable (excluding
framing bits but including FCS octets), including
those octets in bad packets."
::= { hostEntry 7 }
hostOutErrors OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of bad packets transmitted by this address
since this host was added to the hostTable."
::= { hostEntry 8 }
hostOutBroadcastPkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of good packets transmitted by this
address that were directed to the broadcast address
since this host was added to the hostTable."
::= { hostEntry 9 }
hostOutMulticastPkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of good packets transmitted by this
address that were directed to a multicast address
since this host was added to the hostTable.
Note that this number does not include packets
directed to the broadcast address."
::= { hostEntry 10 }
-- host Time Table
hostTimeTable OBJECT-TYPE
SYNTAX SEQUENCE OF HostTimeEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of time-ordered host table entries."
Waldbusser [Page 45]
RFC 1757 Remote Network Monitoring MIB February 1995
::= { hosts 3 }
hostTimeEntry OBJECT-TYPE
SYNTAX HostTimeEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A collection of statistics for a particular host
that has been discovered on an interface of this
device. This collection includes the relative
ordering of the creation time of this object. For
example, an instance of the hostTimeOutBroadcastPkts
object might be named
hostTimeOutBroadcastPkts.1.687"
INDEX { hostTimeIndex, hostTimeCreationOrder }
::= { hostTimeTable 1 }
HostTimeEntry ::= SEQUENCE {
hostTimeAddress OCTET STRING,
hostTimeCreationOrder INTEGER (1..65535),
hostTimeIndex INTEGER (1..65535),
hostTimeInPkts Counter,
hostTimeOutPkts Counter,
hostTimeInOctets Counter,
hostTimeOutOctets Counter,
hostTimeOutErrors Counter,
hostTimeOutBroadcastPkts Counter,
hostTimeOutMulticastPkts Counter
}
hostTimeAddress OBJECT-TYPE
SYNTAX OCTET STRING
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The physical address of this host."
::= { hostTimeEntry 1 }
hostTimeCreationOrder OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"An index that uniquely identifies an entry in
the hostTime table among those entries associated
with the same hostControlEntry. This index shall
be between 1 and N, where N is the value of
the associated hostControlTableSize. The ordering
Waldbusser [Page 46]
RFC 1757 Remote Network Monitoring MIB February 1995
of the indexes is based on the order of each entry's
insertion into the table, in which entries added
earlier have a lower index value than entries added
later. Thus the management station has the ability to
learn of new entries added to this table without
downloading the entire table.
It is important to note that the index for a
particular entry may change as an (earlier) entry
is deleted from the table. Because this order may
change, management stations should make use of the
hostControlLastDeleteTime variable in the
hostControlEntry associated with the relevant
portion of the hostTimeTable. By observing
this variable, the management station may detect
the circumstances where a download of the table
may have missed entries, and where a previous
association between a value of hostTimeCreationOrder
and a hostTimeEntry may no longer hold."
::= { hostTimeEntry 2 }
hostTimeIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The set of collected host statistics of which
this entry is a part. The set of hosts
identified by a particular value of this
index is associated with the hostControlEntry
as identified by the same value of hostControlIndex."
::= { hostTimeEntry 3 }
hostTimeInPkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of good packets transmitted to this
address since it was added to the hostTimeTable."
::= { hostTimeEntry 4 }
hostTimeOutPkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of god packets transmitted by this
Waldbusser [Page 47]
RFC 1757 Remote Network Monitoring MIB February 1995
address since it was added to the hostTimeTable."
::= { hostTimeEntry 5 }
hostTimeInOctets OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of octets transmitted to this address
since it was added to the hostTimeTable (excluding
framing bits but including FCS octets), except for
those octets in bad packets."
::= { hostTimeEntry 6 }
hostTimeOutOctets OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of octets transmitted by this address
since it was added to the hostTimeTable (excluding
framing bits but including FCS octets), including
those octets in bad packets."
::= { hostTimeEntry 7 }
hostTimeOutErrors OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of bad packets transmitted by this address
since this host was added to the hostTimeTable."
::= { hostTimeEntry 8 }
hostTimeOutBroadcastPkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of good packets transmitted by this
address that were directed to the broadcast address
since this host was added to the hostTimeTable."
::= { hostTimeEntry 9 }
hostTimeOutMulticastPkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
Waldbusser [Page 48]
RFC 1757 Remote Network Monitoring MIB February 1995
DESCRIPTION
"The number of good packets transmitted by this
address that were directed to a multicast address
since this host was added to the hostTimeTable.
Note that this number does not include packets
directed to the broadcast address."
::= { hostTimeEntry 10 }
-- The Host Top "N" Group
-- Implementation of the Host Top N group is optional.
--
-- The Host Top N group requires the implementation of the
-- host group.
--
-- The Host Top N group is used to prepare reports that
-- describe the hosts that top a list ordered by one of
-- their statistics.
-- The available statistics are samples of one of their
-- base statistics, over an interval specified by the
-- management station. Thus, these statistics are rate
-- based. The management station also selects how many such
-- hosts are reported.
-- The hostTopNControlTable is used to initiate the
-- generation of such a report. The management station
-- may select the parameters of such a report, such as
-- which interface, which statistic, how many hosts,
-- and the start and stop times of the sampling. When
-- the report is prepared, entries are created in the
-- hostTopNTable associated with the relevant
-- hostTopNControlEntry. These entries are static for
-- each report after it has been prepared.
hostTopNControlTable OBJECT-TYPE
SYNTAX SEQUENCE OF HostTopNControlEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of top N host control entries."
::= { hostTopN 1 }
hostTopNControlEntry OBJECT-TYPE
SYNTAX HostTopNControlEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
Waldbusser [Page 49]
RFC 1757 Remote Network Monitoring MIB February 1995
"A set of parameters that control the creation of a
report of the top N hosts according to several
metrics. For example, an instance of the
hostTopNDuration object might be named
hostTopNDuration.3"
INDEX { hostTopNControlIndex }
::= { hostTopNControlTable 1 }
HostTopNControlEntry ::= SEQUENCE {
hostTopNControlIndex INTEGER (1..65535),
hostTopNHostIndex INTEGER (1..65535),
hostTopNRateBase INTEGER,
hostTopNTimeRemaining INTEGER,
hostTopNDuration INTEGER,
hostTopNRequestedSize INTEGER,
hostTopNGrantedSize INTEGER,
hostTopNStartTime TimeTicks,
hostTopNOwner OwnerString,
hostTopNStatus EntryStatus
}
hostTopNControlIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"An index that uniquely identifies an entry
in the hostTopNControl table. Each such
entry defines one top N report prepared for
one interface."
::= { hostTopNControlEntry 1 }
hostTopNHostIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The host table for which a top N report will be
prepared on behalf of this entry. The host table
identified by a particular value of this index is
associated with the same host table as identified by
the same value of hostIndex.
This object may not be modified if the associated
hostTopNStatus object is equal to valid(1)."
::= { hostTopNControlEntry 2 }
hostTopNRateBase OBJECT-TYPE
Waldbusser [Page 50]
RFC 1757 Remote Network Monitoring MIB February 1995
SYNTAX INTEGER {
hostTopNInPkts(1),
hostTopNOutPkts(2),
hostTopNInOctets(3),
hostTopNOutOctets(4),
hostTopNOutErrors(5),
hostTopNOutBroadcastPkts(6),
hostTopNOutMulticastPkts(7)
}
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The variable for each host that the hostTopNRate
variable is based upon.
This object may not be modified if the associated
hostTopNStatus object is equal to valid(1)."
::= { hostTopNControlEntry 3 }
hostTopNTimeRemaining OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The number of seconds left in the report currently
being collected. When this object is modified by
the management station, a new collection is started,
possibly aborting a currently running report. The
new value is used as the requested duration of this
report, which is loaded into the associated
hostTopNDuration object.
When this object is set to a non-zero value, any
associated hostTopNEntries shall be made
inaccessible by the monitor. While the value of
this object is non-zero, it decrements by one per
second until it reaches zero. During this time, all
associated hostTopNEntries shall remain
inaccessible. At the time that this object
decrements to zero, the report is made accessible in
the hostTopNTable. Thus, the hostTopN table needs
to be created only at the end of the collection
interval."
DEFVAL { 0 }
::= { hostTopNControlEntry 4 }
hostTopNDuration OBJECT-TYPE
SYNTAX INTEGER
Waldbusser [Page 51]
RFC 1757 Remote Network Monitoring MIB February 1995
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of seconds that this report has collected
during the last sampling interval, or if this
report is currently being collected, the number
of seconds that this report is being collected
during this sampling interval.
When the associated hostTopNTimeRemaining object is
set, this object shall be set by the probe to the
same value and shall not be modified until the next
time the hostTopNTimeRemaining is set.
This value shall be zero if no reports have been
requested for this hostTopNControlEntry."
DEFVAL { 0 }
::= { hostTopNControlEntry 5 }
hostTopNRequestedSize OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The maximum number of hosts requested for the top N
table.
When this object is created or modified, the probe
should set hostTopNGrantedSize as closely to this
object as is possible for the particular probe
implementation and available resources."
DEFVAL { 10 }
::= { hostTopNControlEntry 6 }
hostTopNGrantedSize OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The maximum number of hosts in the top N table.
When the associated hostTopNRequestedSize object is
created or modified, the probe should set this
object as closely to the requested value as is
possible for the particular implementation and
available resources. The probe must not lower this
value except as a result of a set to the associated
hostTopNRequestedSize object.
Waldbusser [Page 52]
RFC 1757 Remote Network Monitoring MIB February 1995
Hosts with the highest value of hostTopNRate shall be
placed in this table in decreasing order of this rate
until there is no more room or until there are no more
hosts."
::= { hostTopNControlEntry 7 }
hostTopNStartTime OBJECT-TYPE
SYNTAX TimeTicks
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The value of sysUpTime when this top N report was
last started. In other words, this is the time that
the associated hostTopNTimeRemaining object was
modified to start the requested report."
::= { hostTopNControlEntry 8 }
hostTopNOwner OBJECT-TYPE
SYNTAX OwnerString
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The entity that configured this entry and is
therefore using the resources assigned to it."
::= { hostTopNControlEntry 9 }
hostTopNStatus OBJECT-TYPE
SYNTAX EntryStatus
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The status of this hostTopNControl entry.
If this object is not equal to valid(1), all
associated hostTopNEntries shall be deleted by the
agent."
::= { hostTopNControlEntry 10 }
hostTopNTable OBJECT-TYPE
SYNTAX SEQUENCE OF HostTopNEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of top N host entries."
::= { hostTopN 2 }
hostTopNEntry OBJECT-TYPE
SYNTAX HostTopNEntry
Waldbusser [Page 53]
RFC 1757 Remote Network Monitoring MIB February 1995
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A set of statistics for a host that is part of a
top N report. For example, an instance of the
hostTopNRate object might be named
hostTopNRate.3.10"
INDEX { hostTopNReport, hostTopNIndex }
::= { hostTopNTable 1 }
HostTopNEntry ::= SEQUENCE {
hostTopNReport INTEGER (1..65535),
hostTopNIndex INTEGER (1..65535),
hostTopNAddress OCTET STRING,
hostTopNRate INTEGER
}
hostTopNReport OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"This object identifies the top N report of which
this entry is a part. The set of hosts
identified by a particular value of this
object is part of the same report as identified
by the same value of the hostTopNControlIndex object."
::= { hostTopNEntry 1 }
hostTopNIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"An index that uniquely identifies an entry in
the hostTopN table among those in the same report.
This index is between 1 and N, where N is the
number of entries in this table. Increasing values
of hostTopNIndex shall be assigned to entries with
decreasing values of hostTopNRate until index N
is assigned to the entry with the lowest value of
hostTopNRate or there are no more hostTopNEntries."
::= { hostTopNEntry 2 }
hostTopNAddress OBJECT-TYPE
SYNTAX OCTET STRING
ACCESS read-only
STATUS mandatory
Waldbusser [Page 54]
RFC 1757 Remote Network Monitoring MIB February 1995
DESCRIPTION
"The physical address of this host."
::= { hostTopNEntry 3 }
hostTopNRate OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The amount of change in the selected variable
during this sampling interval. The selected
variable is this host's instance of the object
selected by hostTopNRateBase."
::= { hostTopNEntry 4 }
-- The Matrix Group
-- Implementation of the Matrix group is optional.
--
-- The Matrix group consists of the matrixControlTable,
-- matrixSDTable and the matrixDSTable. These tables
-- store statistics for a particular conversation
-- between two addresses. As the device detects a new
-- conversation, including those to a non-unicast
-- address, it creates a new entry in both of the
-- matrix tables. It must only create new entries
-- based on information received in good packets. If
-- the monitoring device finds itself short of
-- resources, it may delete entries as needed. It is
-- suggested that the device delete the least recently
-- used entries first.
matrixControlTable OBJECT-TYPE
SYNTAX SEQUENCE OF MatrixControlEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of information entries for the
traffic matrix on each interface."
::= { matrix 1 }
matrixControlEntry OBJECT-TYPE
SYNTAX MatrixControlEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"Information about a traffic matrix on a particular
Waldbusser [Page 55]
RFC 1757 Remote Network Monitoring MIB February 1995
interface. For example, an instance of the
matrixControlLastDeleteTime object might be named
matrixControlLastDeleteTime.1"
INDEX { matrixControlIndex }
::= { matrixControlTable 1 }
MatrixControlEntry ::= SEQUENCE {
matrixControlIndex INTEGER (1..65535),
matrixControlDataSource OBJECT IDENTIFIER,
matrixControlTableSize INTEGER,
matrixControlLastDeleteTime TimeTicks,
matrixControlOwner OwnerString,
matrixControlStatus EntryStatus
}
matrixControlIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"An index that uniquely identifies an entry in the
matrixControl table. Each such entry defines
a function that discovers conversations on a
particular interface and places statistics about
them in the matrixSDTable and the matrixDSTable on
behalf of this matrixControlEntry."
::= { matrixControlEntry 1 }
matrixControlDataSource OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
ACCESS read-write
STATUS mandatory
DESCRIPTION
"This object identifies the source of
the data from which this entry creates a traffic
matrix. This source can be any interface on this
device. In order to identify a particular
interface, this object shall identify the instance
of the ifIndex object, defined in RFC 1213 and RFC
1573 [4,6], for the desired interface. For example,
if an entry were to receive data from interface #1,
this object would be set to ifIndex.1.
The statistics in this group reflect all packets
on the local network segment attached to the
identified interface.
An agent may or may not be able to tell if
Waldbusser [Page 56]
RFC 1757 Remote Network Monitoring MIB February 1995
fundamental changes to the media of the interface
have occurred and necessitate an invalidation of
this entry. For example, a hot-pluggable ethernet
card could be pulled out and replaced by a
token-ring card. In such a case, if the agent has
such knowledge of the change, it is recommended that
it invalidate this entry.
This object may not be modified if the associated
matrixControlStatus object is equal to valid(1)."
::= { matrixControlEntry 2 }
matrixControlTableSize OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of matrixSDEntries in the matrixSDTable
for this interface. This must also be the value of
the number of entries in the matrixDSTable for this
interface."
::= { matrixControlEntry 3 }
matrixControlLastDeleteTime OBJECT-TYPE
SYNTAX TimeTicks
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The value of sysUpTime when the last entry
was deleted from the portion of the matrixSDTable
or matrixDSTable associated with this
matrixControlEntry. If no deletions have occurred,
this value shall be zero."
::= { matrixControlEntry 4 }
matrixControlOwner OBJECT-TYPE
SYNTAX OwnerString
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The entity that configured this entry and is
therefore using the resources assigned to it."
::= { matrixControlEntry 5 }
matrixControlStatus OBJECT-TYPE
SYNTAX EntryStatus
ACCESS read-write
STATUS mandatory
Waldbusser [Page 57]
RFC 1757 Remote Network Monitoring MIB February 1995
DESCRIPTION
"The status of this matrixControl entry.
If this object is not equal to valid(1), all
associated entries in the matrixSDTable and the
matrixDSTable shall be deleted by the agent."
::= { matrixControlEntry 6 }
matrixSDTable OBJECT-TYPE
SYNTAX SEQUENCE OF MatrixSDEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of traffic matrix entries indexed by
source and destination MAC address."
::= { matrix 2 }
matrixSDEntry OBJECT-TYPE
SYNTAX MatrixSDEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A collection of statistics for communications between
two addresses on a particular interface. For example,
an instance of the matrixSDPkts object might be named
matrixSDPkts.1.6.8.0.32.27.3.176.6.8.0.32.10.8.113"
INDEX { matrixSDIndex,
matrixSDSourceAddress, matrixSDDestAddress }
::= { matrixSDTable 1 }
MatrixSDEntry ::= SEQUENCE {
matrixSDSourceAddress OCTET STRING,
matrixSDDestAddress OCTET STRING,
matrixSDIndex INTEGER (1..65535),
matrixSDPkts Counter,
matrixSDOctets Counter,
matrixSDErrors Counter
}
matrixSDSourceAddress OBJECT-TYPE
SYNTAX OCTET STRING
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The source physical address."
::= { matrixSDEntry 1 }
matrixSDDestAddress OBJECT-TYPE
Waldbusser [Page 58]
RFC 1757 Remote Network Monitoring MIB February 1995
SYNTAX OCTET STRING
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The destination physical address."
::= { matrixSDEntry 2 }
matrixSDIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The set of collected matrix statistics of which
this entry is a part. The set of matrix statistics
identified by a particular value of this index
is associated with the same matrixControlEntry
as identified by the same value of
matrixControlIndex."
::= { matrixSDEntry 3 }
matrixSDPkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of packets transmitted from the source
address to the destination address (this number
includes bad packets)."
::= { matrixSDEntry 4 }
matrixSDOctets OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of octets (excluding framing bits but
including FCS octets) contained in all packets
transmitted from the source address to the
destination address."
::= { matrixSDEntry 5 }
matrixSDErrors OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of bad packets transmitted from
the source address to the destination address."
Waldbusser [Page 59]
RFC 1757 Remote Network Monitoring MIB February 1995
::= { matrixSDEntry 6 }
-- Traffic matrix tables from destination to source
matrixDSTable OBJECT-TYPE
SYNTAX SEQUENCE OF MatrixDSEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of traffic matrix entries indexed by
destination and source MAC address."
::= { matrix 3 }
matrixDSEntry OBJECT-TYPE
SYNTAX MatrixDSEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A collection of statistics for communications between
two addresses on a particular interface. For example,
an instance of the matrixSDPkts object might be named
matrixSDPkts.1.6.8.0.32.10.8.113.6.8.0.32.27.3.176"
INDEX { matrixDSIndex,
matrixDSDestAddress, matrixDSSourceAddress }
::= { matrixDSTable 1 }
MatrixDSEntry ::= SEQUENCE {
matrixDSSourceAddress OCTET STRING,
matrixDSDestAddress OCTET STRING,
matrixDSIndex INTEGER (1..65535),
matrixDSPkts Counter,
matrixDSOctets Counter,
matrixDSErrors Counter
}
matrixDSSourceAddress OBJECT-TYPE
SYNTAX OCTET STRING
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The source physical address."
::= { matrixDSEntry 1 }
matrixDSDestAddress OBJECT-TYPE
SYNTAX OCTET STRING
ACCESS read-only
STATUS mandatory
Waldbusser [Page 60]
RFC 1757 Remote Network Monitoring MIB February 1995
DESCRIPTION
"The destination physical address."
::= { matrixDSEntry 2 }
matrixDSIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The set of collected matrix statistics of which
this entry is a part. The set of matrix statistics
identified by a particular value of this index
is associated with the same matrixControlEntry
as identified by the same value of
matrixControlIndex."
::= { matrixDSEntry 3 }
matrixDSPkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of packets transmitted from the source
address to the destination address (this number
includes bad packets)."
::= { matrixDSEntry 4 }
matrixDSOctets OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of octets (excluding framing bits
but including FCS octets) contained in all packets
transmitted from the source address to the
destination address."
::= { matrixDSEntry 5 }
matrixDSErrors OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of bad packets transmitted from
the source address to the destination address."
::= { matrixDSEntry 6 }
Waldbusser [Page 61]
RFC 1757 Remote Network Monitoring MIB February 1995
-- The Filter Group
-- Implementation of the Filter group is optional.
--
-- The Filter group allows packets to be captured with an
-- arbitrary filter expression. A logical data and
-- event stream or "channel" is formed by the packets
-- that match the filter expression.
--
-- This filter mechanism allows the creation of an arbitrary
-- logical expression with which to filter packets. Each
-- filter associated with a channel is OR'ed with the others.
-- Within a filter, any bits checked in the data and status
-- are AND'ed with respect to other bits in the same filter.
-- The NotMask also allows for checking for inequality.
-- Finally, the channelAcceptType object allows for
-- inversion of the whole equation.
--
-- If a management station wishes to receive a trap to alert
-- it that new packets have been captured and are available
-- for download, it is recommended that it set up an alarm
-- entry that monitors the value of the relevant
-- channelMatches instance.
--
-- The channel can be turned on or off, and can also
-- generate events when packets pass through it.
filterTable OBJECT-TYPE
SYNTAX SEQUENCE OF FilterEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of packet filter entries."
::= { filter 1 }
filterEntry OBJECT-TYPE
SYNTAX FilterEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A set of parameters for a packet filter applied on a
particular interface. As an example, an instance of
the filterPktData object might be named
filterPktData.12"
INDEX { filterIndex }
::= { filterTable 1 }
Waldbusser [Page 62]
RFC 1757 Remote Network Monitoring MIB February 1995
FilterEntry ::= SEQUENCE {
filterIndex INTEGER (1..65535),
filterChannelIndex INTEGER (1..65535),
filterPktDataOffset INTEGER,
filterPktData OCTET STRING,
filterPktDataMask OCTET STRING,
filterPktDataNotMask OCTET STRING,
filterPktStatus INTEGER,
filterPktStatusMask INTEGER,
filterPktStatusNotMask INTEGER,
filterOwner OwnerString,
filterStatus EntryStatus
}
filterIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"An index that uniquely identifies an entry
in the filter table. Each such entry defines
one filter that is to be applied to every packet
received on an interface."
::= { filterEntry 1 }
filterChannelIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-write
STATUS mandatory
DESCRIPTION
"This object identifies the channel of which this
filter is a part. The filters identified by a
particular value of this object are associated with
the same channel as identified by the same value of
the channelIndex object."
::= { filterEntry 2 }
filterPktDataOffset OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The offset from the beginning of each packet where
a match of packet data will be attempted. This offset
is measured from the point in the physical layer
packet after the framing bits, if any. For example,
in an Ethernet frame, this point is at the beginning
of the destination MAC address.
Waldbusser [Page 63]
RFC 1757 Remote Network Monitoring MIB February 1995
This object may not be modified if the associated
filterStatus object is equal to valid(1)."
DEFVAL { 0 }
::= { filterEntry 3 }
filterPktData OBJECT-TYPE
SYNTAX OCTET STRING
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The data that is to be matched with the input
packet. For each packet received, this filter and
the accompanying filterPktDataMask and
filterPktDataNotMask will be adjusted for the
offset. The only bits relevant to this match
algorithm are those that have the corresponding
filterPktDataMask bit equal to one. The following
three rules are then applied to every packet:
(1) If the packet is too short and does not have data
corresponding to part of the filterPktData, the
packet will fail this data match.
(2) For each relevant bit from the packet with the
corresponding filterPktDataNotMask bit set to
zero, if the bit from the packet is not equal to
the corresponding bit from the filterPktData,
then the packet will fail this data match.
(3) If for every relevant bit from the packet with the
corresponding filterPktDataNotMask bit set to one,
the bit from the packet is equal to the
corresponding bit from the filterPktData, then
the packet will fail this data match.
Any packets that have not failed any of the three
matches above have passed this data match. In
particular, a zero length filter will match any
packet.
This object may not be modified if the associated
filterStatus object is equal to valid(1)."
::= { filterEntry 4 }
filterPktDataMask OBJECT-TYPE
SYNTAX OCTET STRING
ACCESS read-write
STATUS mandatory
Waldbusser [Page 64]
RFC 1757 Remote Network Monitoring MIB February 1995
DESCRIPTION
"The mask that is applied to the match process.
After adjusting this mask for the offset, only those
bits in the received packet that correspond to bits
set in this mask are relevant for further processing
by the match algorithm. The offset is applied to
filterPktDataMask in the same way it is applied to the
filter. For the purposes of the matching algorithm,
if the associated filterPktData object is longer
than this mask, this mask is conceptually extended
with '1' bits until it reaches the length of the
filterPktData object.
This object may not be modified if the associated
filterStatus object is equal to valid(1)."
::= { filterEntry 5 }
filterPktDataNotMask OBJECT-TYPE
SYNTAX OCTET STRING
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The inversion mask that is applied to the match
process. After adjusting this mask for the offset,
those relevant bits in the received packet that
correspond to bits cleared in this mask must all be
equal to their corresponding bits in the
filterPktData object for the packet to be accepted.
In addition, at least one of those relevant bits in
the received packet that correspond to bits set in
this mask must be different to its corresponding bit
in the filterPktData object.
For the purposes of the matching algorithm, if the
associated filterPktData object is longer than this
mask, this mask is conceptually extended with '0'
bits until it reaches the length of the
filterPktData object.
This object may not be modified if the associated
filterStatus object is equal to valid(1)."
::= { filterEntry 6 }
filterPktStatus OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-write
STATUS mandatory
DESCRIPTION
Waldbusser [Page 65]
RFC 1757 Remote Network Monitoring MIB February 1995
"The status that is to be matched with the input
packet. The only bits relevant to this match
algorithm are those that have the corresponding
filterPktStatusMask bit equal to one. The following
two rules are then applied to every packet:
(1) For each relevant bit from the packet status
with the corresponding filterPktStatusNotMask bit
set to zero, if the bit from the packet status is
not equal to the corresponding bit from the
filterPktStatus, then the packet will fail this
status match.
(2) If for every relevant bit from the packet status
with the corresponding filterPktStatusNotMask bit
set to one, the bit from the packet status is
equal to the corresponding bit from the
filterPktStatus, then the packet will fail this
status match.
Any packets that have not failed either of the two
matches above have passed this status match. In
particular, a zero length status filter will match any
packet's status.
The value of the packet status is a sum. This sum
initially takes the value zero. Then, for each
error, E, that has been discovered in this packet,
2 raised to a value representing E is added to the
sum. The errors and the bits that represent them are
dependent on the media type of the interface that
this channel is receiving packets from.
The errors defined for a packet captured off of an
Ethernet interface are as follows:
bit # Error
0 Packet is longer than 1518 octets
1 Packet is shorter than 64 octets
2 Packet experienced a CRC or Alignment
error
For example, an Ethernet fragment would have a
value of 6 (2^1 + 2^2).
As this MIB is expanded to new media types, this
object will have other media-specific errors
defined.
Waldbusser [Page 66]
RFC 1757 Remote Network Monitoring MIB February 1995
For the purposes of this status matching algorithm,
if the packet status is longer than this
filterPktStatus object, this object is conceptually
extended with '0' bits until it reaches the size of
the packet status.
This object may not be modified if the associated
filterStatus object is equal to valid(1)."
::= { filterEntry 7 }
filterPktStatusMask OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The mask that is applied to the status match
process. Only those bits in the received packet
that correspond to bits set in this mask are
relevant for further processing by the status match
algorithm. For the purposes of the matching
algorithm, if the associated filterPktStatus object
is longer than this mask, this mask is conceptually
extended with '1' bits until it reaches the size of
the filterPktStatus. In addition, if a packet
status is longer than this mask, this mask is
conceptually extended with '0' bits until it reaches
the size of the packet status.
This object may not be modified if the associated
filterStatus object is equal to valid(1)."
::= { filterEntry 8 }
filterPktStatusNotMask OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The inversion mask that is applied to the status
match process. Those relevant bits in the received
packet status that correspond to bits cleared in
this mask must all be equal to their corresponding
bits in the filterPktStatus object for the packet to
be accepted. In addition, at least one of those
relevant bits in the received packet status that
correspond to bits set in this mask must be
different to its corresponding bit in the
filterPktStatus object for the packet to be
accepted.
Waldbusser [Page 67]
RFC 1757 Remote Network Monitoring MIB February 1995
For the purposes of the matching algorithm, if the
associated filterPktStatus object or a packet status
is longer than this mask, this mask is conceptually
extended with '0' bits until it reaches the longer
of the lengths of the filterPktStatus object and the
packet status.
This object may not be modified if the associated
filterStatus object is equal to valid(1)."
::= { filterEntry 9 }
filterOwner OBJECT-TYPE
SYNTAX OwnerString
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The entity that configured this entry and is
therefore using the resources assigned to it."
::= { filterEntry 10 }
filterStatus OBJECT-TYPE
SYNTAX EntryStatus
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The status of this filter entry."
::= { filterEntry 11 }
channelTable OBJECT-TYPE
SYNTAX SEQUENCE OF ChannelEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of packet channel entries."
::= { filter 2 }
channelEntry OBJECT-TYPE
SYNTAX ChannelEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A set of parameters for a packet channel applied on a
particular interface. As an example, an instance of
the channelMatches object might be named
channelMatches.3"
INDEX { channelIndex }
::= { channelTable 1 }
Waldbusser [Page 68]
RFC 1757 Remote Network Monitoring MIB February 1995
ChannelEntry ::= SEQUENCE {
channelIndex INTEGER (1..65535),
channelIfIndex INTEGER (1..65535),
channelAcceptType INTEGER,
channelDataControl INTEGER,
channelTurnOnEventIndex INTEGER (0..65535),
channelTurnOffEventIndex INTEGER (0..65535),
channelEventIndex INTEGER (0..65535),
channelEventStatus INTEGER,
channelMatches Counter,
channelDescription DisplayString (SIZE (0..127)),
channelOwner OwnerString,
channelStatus EntryStatus
}
channelIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"An index that uniquely identifies an entry in the
channel table. Each such entry defines one channel,
a logical data and event stream.
It is suggested that before creating a channel, an
application should scan all instances of the
filterChannelIndex object to make sure that there
are no pre-existing filters that would be
inadvertently be linked to the channel."
::= { channelEntry 1 }
channelIfIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The value of this object uniquely identifies the
interface on this remote network monitoring device
to which the associated filters are applied to allow
data into this channel. The interface identified by
a particular value of this object is the same
interface as identified by the same value of the
ifIndex object, defined in RFC 1213 and RFC 1573
[4,6].
The filters in this group are applied to all packets
on the local network segment attached to the
identified interface.
Waldbusser [Page 69]
RFC 1757 Remote Network Monitoring MIB February 1995
An agent may or may not be able to tell if
fundamental changes to the media of the interface
have occurred and necessitate an invalidation of
this entry. For example, a hot-pluggable ethernet
card could be pulled out and replaced by a
token-ring card. In such a case, if the agent has
such knowledge of the change, it is recommended that
it invalidate this entry.
This object may not be modified if the associated
channelStatus object is equal to valid(1)."
::= { channelEntry 2 }
channelAcceptType OBJECT-TYPE
SYNTAX INTEGER {
acceptMatched(1),
acceptFailed(2)
}
ACCESS read-write
STATUS mandatory
DESCRIPTION
"This object controls the action of the filters
associated with this channel. If this object is equal
to acceptMatched(1), packets will be accepted to this
channel if they are accepted by both the packet data
and packet status matches of an associated filter. If
this object is equal to acceptFailed(2), packets will
be accepted to this channel only if they fail either
the packet data match or the packet status match of
each of the associated filters.
In particular, a channel with no associated filters
will match no packets if set to acceptMatched(1)
case and will match all packets in the
acceptFailed(2) case.
This object may not be modified if the associated
channelStatus object is equal to valid(1)."
::= { channelEntry 3 }
channelDataControl OBJECT-TYPE
SYNTAX INTEGER {
on(1),
off(2)
}
ACCESS read-write
STATUS mandatory
DESCRIPTION
Waldbusser [Page 70]
RFC 1757 Remote Network Monitoring MIB February 1995
"This object controls the flow of data through this
channel. If this object is on(1), data, status and
events flow through this channel. If this object is
off(2), data, status and events will not flow
through this channel."
DEFVAL { off }
::= { channelEntry 4 }
channelTurnOnEventIndex OBJECT-TYPE
SYNTAX INTEGER (0..65535)
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The value of this object identifies the event
that is configured to turn the associated
channelDataControl from off to on when the event is
generated. The event identified by a particular value
of this object is the same event as identified by the
same value of the eventIndex object. If there is no
corresponding entry in the eventTable, then no
association exists. In fact, if no event is intended
for this channel, channelTurnOnEventIndex must be
set to zero, a non-existent event index.
This object may not be modified if the associated
channelStatus object is equal to valid(1)."
::= { channelEntry 5 }
channelTurnOffEventIndex OBJECT-TYPE
SYNTAX INTEGER (0..65535)
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The value of this object identifies the event
that is configured to turn the associated
channelDataControl from on to off when the event is
generated. The event identified by a particular value
of this object is the same event as identified by the
same value of the eventIndex object. If there is no
corresponding entry in the eventTable, then no
association exists. In fact, if no event is intended
for this channel, channelTurnOffEventIndex must be
set to zero, a non-existent event index.
This object may not be modified if the associated
channelStatus object is equal to valid(1)."
::= { channelEntry 6 }
Waldbusser [Page 71]
RFC 1757 Remote Network Monitoring MIB February 1995
channelEventIndex OBJECT-TYPE
SYNTAX INTEGER (0..65535)
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The value of this object identifies the event
that is configured to be generated when the
associated channelDataControl is on and a packet
is matched. The event identified by a particular
value of this object is the same event as identified
by the same value of the eventIndex object. If
there is no corresponding entry in the eventTable,
then no association exists. In fact, if no event is
intended for this channel, channelEventIndex must be
set to zero, a non-existent event index.
This object may not be modified if the associated
channelStatus object is equal to valid(1)."
::= { channelEntry 7 }
channelEventStatus OBJECT-TYPE
SYNTAX INTEGER {
eventReady(1),
eventFired(2),
eventAlwaysReady(3)
}
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The event status of this channel.
If this channel is configured to generate events
when packets are matched, a means of controlling
the flow of those events is often needed. When
this object is equal to eventReady(1), a single
event may be generated, after which this object
will be set by the probe to eventFired(2). While
in the eventFired(2) state, no events will be
generated until the object is modified to
eventReady(1) (or eventAlwaysReady(3)). The
management station can thus easily respond to a
notification of an event by re-enabling this object.
If the management station wishes to disable this
flow control and allow events to be generated
at will, this object may be set to
eventAlwaysReady(3). Disabling the flow control
is discouraged as it can result in high network
Waldbusser [Page 72]
RFC 1757 Remote Network Monitoring MIB February 1995
traffic or other performance problems."
DEFVAL { eventReady }
::= { channelEntry 8 }
channelMatches OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of times this channel has matched a
packet. Note that this object is updated even when
channelDataControl is set to off."
::= { channelEntry 9 }
channelDescription OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..127))
ACCESS read-write
STATUS mandatory
DESCRIPTION
"A comment describing this channel."
::= { channelEntry 10 }
channelOwner OBJECT-TYPE
SYNTAX OwnerString
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The entity that configured this entry and is
therefore using the resources assigned to it."
::= { channelEntry 11 }
channelStatus OBJECT-TYPE
SYNTAX EntryStatus
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The status of this channel entry."
::= { channelEntry 12 }
-- The Packet Capture Group
-- Implementation of the Packet Capture group is optional.
--
-- The Packet Capture Group requires implementation of the
-- Filter Group.
--
-- The Packet Capture group allows packets to be captured
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-- upon a filter match. The bufferControlTable controls
-- the captured packets output from a channel that is
-- associated with it. The captured packets are placed
-- in entries in the captureBufferTable. These entries are
-- associated with the bufferControlEntry on whose behalf they
-- were stored.
bufferControlTable OBJECT-TYPE
SYNTAX SEQUENCE OF BufferControlEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of buffers control entries."
::= { capture 1 }
bufferControlEntry OBJECT-TYPE
SYNTAX BufferControlEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A set of parameters that control the collection of
a stream of packets that have matched filters. As
an example, an instance of the
bufferControlCaptureSliceSize object might be named
bufferControlCaptureSliceSize.3"
INDEX { bufferControlIndex }
::= { bufferControlTable 1 }
BufferControlEntry ::= SEQUENCE {
bufferControlIndex INTEGER (1..65535),
bufferControlChannelIndex INTEGER (1..65535),
bufferControlFullStatus INTEGER,
bufferControlFullAction INTEGER,
bufferControlCaptureSliceSize INTEGER,
bufferControlDownloadSliceSize INTEGER,
bufferControlDownloadOffset INTEGER,
bufferControlMaxOctetsRequested INTEGER,
bufferControlMaxOctetsGranted INTEGER,
bufferControlCapturedPackets INTEGER,
bufferControlTurnOnTime TimeTicks,
bufferControlOwner OwnerString,
bufferControlStatus EntryStatus
}
bufferControlIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
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DESCRIPTION
"An index that uniquely identifies an entry
in the bufferControl table. The value of this
index shall never be zero. Each such
entry defines one set of packets that is
captured and controlled by one or more filters."
::= { bufferControlEntry 1 }
bufferControlChannelIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-write
STATUS mandatory
DESCRIPTION
"An index that identifies the channel that is the
source of packets for this bufferControl table.
The channel identified by a particular value of this
index is the same as identified by the same value of
the channelIndex object.
This object may not be modified if the associated
bufferControlStatus object is equal to valid(1)."
::= { bufferControlEntry 2 }
bufferControlFullStatus OBJECT-TYPE
SYNTAX INTEGER {
spaceAvailable(1),
full(2)
}
ACCESS read-only
STATUS mandatory
DESCRIPTION
"This object shows whether the buffer has room to
accept new packets or if it is full.
If the status is spaceAvailable(1), the buffer is
accepting new packets normally. If the status is
full(2) and the associated bufferControlFullAction
object is wrapWhenFull, the buffer is accepting new
packets by deleting enough of the oldest packets
to make room for new ones as they arrive. Otherwise,
if the status is full(2) and the
bufferControlFullAction object is lockWhenFull,
then the buffer has stopped collecting packets.
When this object is set to full(2) the probe must
not later set it to spaceAvailable(1) except in the
case of a significant gain in resources such as
an increase of bufferControlOctetsGranted. In
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particular, the wrap-mode action of deleting old
packets to make room for newly arrived packets
must not affect the value of this object."
::= { bufferControlEntry 3 }
bufferControlFullAction OBJECT-TYPE
SYNTAX INTEGER {
lockWhenFull(1),
wrapWhenFull(2) -- FIFO
}
ACCESS read-write
STATUS mandatory
DESCRIPTION
"Controls the action of the buffer when it
reaches the full status. When in the lockWhenFull(1)
state and a packet is added to the buffer that
fills the buffer, the bufferControlFullStatus will
be set to full(2) and this buffer will stop capturing
packets."
::= { bufferControlEntry 4 }
bufferControlCaptureSliceSize OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The maximum number of octets of each packet
that will be saved in this capture buffer.
For example, if a 1500 octet packet is received by
the probe and this object is set to 500, then only
500 octets of the packet will be stored in the
associated capture buffer. If this variable is set
to 0, the capture buffer will save as many octets
as is possible.
This object may not be modified if the associated
bufferControlStatus object is equal to valid(1)."
DEFVAL { 100 }
::= { bufferControlEntry 5 }
bufferControlDownloadSliceSize OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The maximum number of octets of each packet
in this capture buffer that will be returned in
an SNMP retrieval of that packet. For example,
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if 500 octets of a packet have been stored in the
associated capture buffer, the associated
bufferControlDownloadOffset is 0, and this
object is set to 100, then the captureBufferPacket
object that contains the packet will contain only
the first 100 octets of the packet.
A prudent manager will take into account possible
interoperability or fragmentation problems that may
occur if the download slice size is set too large.
In particular, conformant SNMP implementations are not
required to accept messages whose length exceeds 484
octets, although they are encouraged to support larger
datagrams whenever feasible."
DEFVAL { 100 }
::= { bufferControlEntry 6 }
bufferControlDownloadOffset OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The offset of the first octet of each packet
in this capture buffer that will be returned in
an SNMP retrieval of that packet. For example,
if 500 octets of a packet have been stored in the
associated capture buffer and this object is set to
100, then the captureBufferPacket object that
contains the packet will contain bytes starting
100 octets into the packet."
DEFVAL { 0 }
::= { bufferControlEntry 7 }
bufferControlMaxOctetsRequested OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The requested maximum number of octets to be
saved in this captureBuffer, including any
implementation-specific overhead. If this variable
is set to -1, the capture buffer will save as many
octets as is possible.
When this object is created or modified, the probe
should set bufferControlMaxOctetsGranted as closely
to this object as is possible for the particular probe
implementation and available resources. However, if
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the object has the special value of -1, the probe
must set bufferControlMaxOctetsGranted to -1."
DEFVAL { -1 }
::= { bufferControlEntry 8 }
bufferControlMaxOctetsGranted OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The maximum number of octets that can be
saved in this captureBuffer, including overhead.
If this variable is -1, the capture buffer will save
as many octets as possible.
When the bufferControlMaxOctetsRequested object is
created or modified, the probe should set this object
as closely to the requested value as is possible for
the particular probe implementation and available
resources.
However, if the request object has the special value
of -1, the probe must set this object to -1.
The probe must not lower this value except as a result
of a modification to the associated
bufferControlMaxOctetsRequested object.
When this maximum number of octets is reached
and a new packet is to be added to this
capture buffer and the corresponding
bufferControlFullAction is set to wrapWhenFull(2),
enough of the oldest packets associated with this
capture buffer shall be deleted by the agent so
that the new packet can be added. If the
corresponding bufferControlFullAction is set to
lockWhenFull(1), the new packet shall be discarded.
In either case, the probe must set
bufferControlFullStatus to full(2).
When the value of this object changes to a value less
than the current value, entries are deleted from
the captureBufferTable associated with this
bufferControlEntry. Enough of the
oldest of these captureBufferEntries shall be
deleted by the agent so that the number of octets
used remains less than or equal to the new value of
this object.
When the value of this object changes to a value
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RFC 1757 Remote Network Monitoring MIB February 1995
greater than the current value, the number of
associated captureBufferEntries may be allowed to
grow."
::= { bufferControlEntry 9 }
bufferControlCapturedPackets OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of packets currently in this
captureBuffer."
::= { bufferControlEntry 10 }
bufferControlTurnOnTime OBJECT-TYPE
SYNTAX TimeTicks
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The value of sysUpTime when this capture buffer was
first turned on."
::= { bufferControlEntry 11 }
bufferControlOwner OBJECT-TYPE
SYNTAX OwnerString
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The entity that configured this entry and is
therefore using the resources assigned to it."
::= { bufferControlEntry 12 }
bufferControlStatus OBJECT-TYPE
SYNTAX EntryStatus
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The status of this buffer Control Entry."
::= { bufferControlEntry 13 }
captureBufferTable OBJECT-TYPE
SYNTAX SEQUENCE OF CaptureBufferEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of packets captured off of a channel."
::= { capture 2 }
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captureBufferEntry OBJECT-TYPE
SYNTAX CaptureBufferEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A packet captured off of an attached network. As an
example, an instance of the captureBufferPacketData
object might be named captureBufferPacketData.3.1783"
INDEX { captureBufferControlIndex, captureBufferIndex }
::= { captureBufferTable 1 }
CaptureBufferEntry ::= SEQUENCE {
captureBufferControlIndex INTEGER (1..65535),
captureBufferIndex INTEGER (1..2147483647),
captureBufferPacketID INTEGER,
captureBufferPacketData OCTET STRING,
captureBufferPacketLength INTEGER,
captureBufferPacketTime INTEGER,
captureBufferPacketStatus INTEGER
}
captureBufferControlIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The index of the bufferControlEntry with which
this packet is associated."
::= { captureBufferEntry 1 }
captureBufferIndex OBJECT-TYPE
SYNTAX INTEGER (1..2147483647)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"An index that uniquely identifies an entry
in the captureBuffer table associated with a
particular bufferControlEntry. This index will
start at 1 and increase by one for each new packet
added with the same captureBufferControlIndex.
Should this value reach 2147483647, the next packet
added with the same captureBufferControlIndex shall
cause this value to wrap around to 1."
::= { captureBufferEntry 2 }
captureBufferPacketID OBJECT-TYPE
SYNTAX INTEGER
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RFC 1757 Remote Network Monitoring MIB February 1995
ACCESS read-only
STATUS mandatory
DESCRIPTION
"An index that describes the order of packets
that are received on a particular interface.
The packetID of a packet captured on an
interface is defined to be greater than the
packetID's of all packets captured previously on
the same interface. As the captureBufferPacketID
object has a maximum positive value of 2^31 - 1,
any captureBufferPacketID object shall have the
value of the associated packet's packetID mod 2^31."
::= { captureBufferEntry 3 }
captureBufferPacketData OBJECT-TYPE
SYNTAX OCTET STRING
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The data inside the packet, starting at the
beginning of the packet plus any offset specified in
the associated bufferControlDownloadOffset,
including any link level headers. The length of the
data in this object is the minimum of the length of
the captured packet minus the offset, the length of
the associated bufferControlCaptureSliceSize minus
the offset, and the associated
bufferControlDownloadSliceSize. If this minimum is
less than zero, this object shall have a length of
zero."
::= { captureBufferEntry 4 }
captureBufferPacketLength OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The actual length (off the wire) of the packet stored
in this entry, including FCS octets."
::= { captureBufferEntry 5 }
captureBufferPacketTime OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of milliseconds that had passed since
this capture buffer was first turned on when this
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RFC 1757 Remote Network Monitoring MIB February 1995
packet was captured."
::= { captureBufferEntry 6 }
captureBufferPacketStatus OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-only
STATUS mandatory
DESCRIPTION
"A value which indicates the error status of this
packet.
The value of this object is defined in the same way as
filterPktStatus. The value is a sum. This sum
initially takes the value zero. Then, for each
error, E, that has been discovered in this packet,
2 raised to a value representing E is added to the
sum.
The errors defined for a packet captured off of an
Ethernet interface are as follows:
bit # Error
0 Packet is longer than 1518 octets
1 Packet is shorter than 64 octets
2 Packet experienced a CRC or Alignment
error
3 First packet in this capture buffer after
it was detected that some packets were
not processed correctly.
4 Packet's order in buffer is only
approximate (May only be set for packets
sent from the probe)
For example, an Ethernet fragment would have a
value of 6 (2^1 + 2^2).
As this MIB is expanded to new media types, this
object will have other media-specific errors defined."
::= { captureBufferEntry 7 }
-- The Event Group
-- Implementation of the Event group is optional.
--
-- The Event group controls the generation and notification
-- of events from this device. Each entry in the eventTable
-- describes the parameters of the event that can be
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RFC 1757 Remote Network Monitoring MIB February 1995
-- triggered. Each event entry is fired by an associated
-- condition located elsewhere in the MIB. An event entry
-- may also be associated- with a function elsewhere in the
-- MIB that will be executed when the event is generated. For
-- example, a channel may be turned on or off by the firing
-- of an event.
--
-- Each eventEntry may optionally specify that a log entry
-- be created on its behalf whenever the event occurs.
-- Each entry may also specify that notification should
-- occur by way of SNMP trap messages. In this case, the
-- community for the trap message is given in the associated
-- eventCommunity object. The enterprise and specific trap
-- fields of the trap are determined by the condition that
-- triggered the event. Two traps are defined: risingAlarm
-- and fallingAlarm. If the eventTable is triggered by a
-- condition specified elsewhere, the enterprise and
-- specific trap fields must be specified for traps
-- generated for that condition.
eventTable OBJECT-TYPE
SYNTAX SEQUENCE OF EventEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of events to be generated."
::= { event 1 }
eventEntry OBJECT-TYPE
SYNTAX EventEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A set of parameters that describe an event to be
generated when certain conditions are met. As an
example, an instance of the eventLastTimeSent object
might be named eventLastTimeSent.6"
INDEX { eventIndex }
::= { eventTable 1 }
EventEntry ::= SEQUENCE {
eventIndex INTEGER (1..65535),
eventDescription DisplayString (SIZE (0..127)),
eventType INTEGER,
eventCommunity OCTET STRING (SIZE (0..127)),
eventLastTimeSent TimeTicks,
eventOwner OwnerString,
eventStatus EntryStatus
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}
eventIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"An index that uniquely identifies an entry in the
event table. Each such entry defines one event that
is to be generated when the appropriate conditions
occur."
::= { eventEntry 1 }
eventDescription OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..127))
ACCESS read-write
STATUS mandatory
DESCRIPTION
"A comment describing this event entry."
::= { eventEntry 2 }
eventType OBJECT-TYPE
SYNTAX INTEGER {
none(1),
log(2),
snmp-trap(3), -- send an SNMP trap
log-and-trap(4)
}
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The type of notification that the probe will make
about this event. In the case of log, an entry is
made in the log table for each event. In the case of
snmp-trap, an SNMP trap is sent to one or more
management stations."
::= { eventEntry 3 }
eventCommunity OBJECT-TYPE
SYNTAX OCTET STRING (SIZE (0..127))
ACCESS read-write
STATUS mandatory
DESCRIPTION
"If an SNMP trap is to be sent, it will be sent to
the SNMP community specified by this octet string.
In the future this table will be extended to include
the party security mechanism. This object shall be
set to a string of length zero if it is intended that
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RFC 1757 Remote Network Monitoring MIB February 1995
that mechanism be used to specify the destination of
the trap."
::= { eventEntry 4 }
eventLastTimeSent OBJECT-TYPE
SYNTAX TimeTicks
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The value of sysUpTime at the time this event
entry last generated an event. If this entry has
not generated any events, this value will be
zero."
::= { eventEntry 5 }
eventOwner OBJECT-TYPE
SYNTAX OwnerString
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The entity that configured this entry and is
therefore using the resources assigned to it.
If this object contains a string starting with
'monitor' and has associated entries in the log
table, all connected management stations should
retrieve those log entries, as they may have
significance to all management stations connected to
this device"
::= { eventEntry 6 }
eventStatus OBJECT-TYPE
SYNTAX EntryStatus
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The status of this event entry.
If this object is not equal to valid(1), all
associated log entries shall be deleted by the
agent."
::= { eventEntry 7 }
--
logTable OBJECT-TYPE
SYNTAX SEQUENCE OF LogEntry
ACCESS not-accessible
STATUS mandatory
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RFC 1757 Remote Network Monitoring MIB February 1995
DESCRIPTION
"A list of events that have been logged."
::= { event 2 }
logEntry OBJECT-TYPE
SYNTAX LogEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A set of data describing an event that has been
logged. For example, an instance of the
logDescription object might be named
logDescription.6.47"
INDEX { logEventIndex, logIndex }
::= { logTable 1 }
LogEntry ::= SEQUENCE {
logEventIndex INTEGER (1..65535),
logIndex INTEGER (1..2147483647),
logTime TimeTicks,
logDescription DisplayString (SIZE (0..255))
}
logEventIndex OBJECT-TYPE
SYNTAX INTEGER (1..65535)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The event entry that generated this log
entry. The log identified by a particular
value of this index is associated with the same
eventEntry as identified by the same value
of eventIndex."
::= { logEntry 1 }
logIndex OBJECT-TYPE
SYNTAX INTEGER (1..2147483647)
ACCESS read-only
STATUS mandatory
DESCRIPTION
"An index that uniquely identifies an entry
in the log table amongst those generated by the
same eventEntries. These indexes are
assigned beginning with 1 and increase by one
with each new log entry. The association
between values of logIndex and logEntries
is fixed for the lifetime of each logEntry.
The agent may choose to delete the oldest
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RFC 1757 Remote Network Monitoring MIB February 1995
instances of logEntry as required because of
lack of memory. It is an implementation-specific
matter as to when this deletion may occur."
::= { logEntry 2 }
logTime OBJECT-TYPE
SYNTAX TimeTicks
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The value of sysUpTime when this log entry was
created."
::= { logEntry 3 }
logDescription OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..255))
ACCESS read-only
STATUS mandatory
DESCRIPTION
"An implementation dependent description of the
event that activated this log entry."
::= { logEntry 4 }
-- These definitions use the TRAP-TYPE macro as
-- defined in RFC 1215 [10]
-- Remote Network Monitoring Traps
risingAlarm TRAP-TYPE
ENTERPRISE rmon
VARIABLES { alarmIndex, alarmVariable, alarmSampleType,
alarmValue, alarmRisingThreshold }
DESCRIPTION
"The SNMP trap that is generated when an alarm
entry crosses its rising threshold and generates
an event that is configured for sending SNMP
traps."
::= 1
fallingAlarm TRAP-TYPE
ENTERPRISE rmon
VARIABLES { alarmIndex, alarmVariable, alarmSampleType,
alarmValue, alarmFallingThreshold }
DESCRIPTION
"The SNMP trap that is generated when an alarm
entry crosses its falling threshold and generates
an event that is configured for sending SNMP
traps."
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RFC 1757 Remote Network Monitoring MIB February 1995
::= 2
END
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RFC 1757 Remote Network Monitoring MIB February 1995
6. Acknowledgments
This document was produced by the IETF Remote Network Monitoring
Working Group.
7. References
[1] Cerf, V., "IAB Recommendations for the Development of Internet
Network Management Standards", RFC 1052, NRI, April 1988.
[2] Cerf, V., "Report of the Second Ad Hoc Network Management Review
Group", RFC 1109, NRI, August 1989.
[3] Rose M., and K. McCloghrie, "Structure and Identification of
Management Information for TCP/IP-based internets", STD 16, RFC
1155, Performance Systems International, Hughes LAN Systems, May
1990.
[4] McCloghrie K., and M. Rose, Editors, "Management Information Base
for Network Management of TCP/IP-based internets", STD 17, RFC
1213, Performance Systems International, March 1991.
[5] Case, J., Fedor, M., Schoffstall, M., and J. Davin, "Simple
Network Management Protocol", STD 15, RFC 1157, SNMP Research,
Performance Systems International, Performance Systems
International, MIT Laboratory for Computer Science, May 1990.
[6] McCloghrie, K., and F. Kastenholz, "Evolution of the Interfaces
Group of MIB-II", RFC 1573, Hughes LAN Systems, FTP Software,
January 1994.
[7] Information processing systems - Open Systems Interconnection -
Specification of Abstract Syntax Notation One (ASN.1),
International Organization for Standardization. International
Standard 8824, (December, 1987).
[8] Information processing systems - Open Systems Interconnection -
Specification of Basic Encoding Rules for Abstract Notation One
(ASN.1), International Organization for Standardization.
International Standard 8825, (December, 1987).
[9] Rose, M., and K. McCloghrie, Editors, "Concise MIB Definitions",
RFC 1212, Performance Systems International, Hughes LAN Systems,
March 1991.
[10] Rose, M., Editor, "A Convention for Defining Traps for use with
the SNMP", RFC 1215, Performance Systems International, March
1991.
Waldbusser [Page 89]
RFC 1757 Remote Network Monitoring MIB February 1995
8. Security Considerations
Security issues are not discussed in this memo.
9. Author's Address
Steven Waldbusser
Carnegie Mellon University
5000 Forbes Ave.
Pittsburgh, PA 15213
EMail: waldbusser@cmu.edu
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RFC 1757 Remote Network Monitoring MIB February 1995
10. Appendix: Changes from RFC 1271
The RMON MIB has not been significantly changed since RFC 1271 was
issued.
Two changes were made to object definitions:
1) A new status bit has been defined for the
captureBufferPacketStatus object, indicating that the packet
order within the capture buffer may not be identical to the
packet order as received off the wire. This bit may only be used
for packets transmitted by the probe. Older NMS applications can
safely ignore this status bit, which might be used by newer
agents.
2) The packetMatch trap has been removed. This trap was never
actually 'approved' and was not added to this document along with
the risingAlarm and fallingAlarm traps. The packetMatch trap
could not be throttled, which could cause disruption of normal
network traffic under some circumstances. An NMS should configure
a risingAlarm threshold on the appropriate channelMatches
instance if a trap is desired for a packetMatch event. Note that
logging of packetMatch events is still supported--only trap
generation for such events has been removed.
In addition, several clarifications to individual object definitions
have been added to assist agent and NMS implementors:
- global definition of "good packets" and "bad packets"
- more detailed text governing conceptual row creation and
modification
- instructions for probes relating to interface changes and
disruptions
- clarification of some ethernet counter definitions
- recommended formula for calculating network utilization
- clarification of channel and captureBuffer behavior for some
unusual conditions
- examples of proper instance naming for each table
Waldbusser [Page 91]
