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- T. Pusateri
- INTERNET DRAFT Consultant
- Expiration date: September 1993 June 1993
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- Managed Objects for the IP Multicast Forwarding Table
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- 1. 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 the IP Multicast Forwarding
- Table. IP Multicast Extensions are defined in RFC 1112 [1].
-
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- 2. Status of this Memo
-
-
-
- This document will be submitted to the RFC editor as an extension to the
- SNMP MIB. Distribution of this memo is unlimited. Please send comments
- to the authors.
-
- This document is an Internet Draft. Internet Drafts are working
- documents of the Internet Engineering Task Force (IETF), its Areas, and
- its Working Groups. Note that other groups may also distribute working
- documents as Internet Drafts.
-
- Internet Drafts are draft documents valid for a maximum of six months.
- Internet Drafts may be updated, replaced, or obsoleted by other
- documents at any time. It is not appropriate to use Internet Drafts as
- reference material or to cite them other than as a "working draft" or
- "work in progress."
-
- Please check the I-D abstract listing contained in each Internet Draft
- directory to learn the current status of this or any other Internet
- Draft.
-
-
- 3. The Network Management Framework
-
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- The Internet-standard Network Management Framework consists of three
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- components. They are:
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- RFC 1155 [2]
- which defines the SMI, the mechanisms used for describing and
- naming objects for the purpose of management. RFC 1212 [3] defines
- a more concise description mechanism, which is wholly consistent
- with the SMI.
-
-
- RFC 1156 [4]
- which defines MIB-I, the core set of managed objects for the
- Internet suite of protocols. RFC 1213 [5], defines MIB-II, an
- evolution of MIB-I based on implementation experience and new
- operational requirements.
-
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- RFC 1157 [6]
- 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.
-
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- 4. Objects
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-
-
- Managed objects are accessed via a virtual information store, termed the
- Management Information Base or MIB. Objects in the MIB are defined
- using the subset of Abstract Syntax Notation One (ASN.1) [7] defined in
- the SMI. In particular, each object has a name, a syntax, and an
- encoding. 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 language is used for this
- purpose. However, the SMI purposely restricts the ASN.1 constructs
- which may be used. These restrictions are explicitly made for
- simplicity.
-
- The encoding of an object type is simply how that object type is
- represented using the object type's syntax. Implicitly tied to the
- notion of an object type's syntax and encoding is how the object type is
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- represented when being transmitted on the network.
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- The SMI specifies the use of the basic encoding rules of ASN.1 [8],
- subject to the additional requirements imposed by the SNMP.
-
- Format of Definitions
-
-
- Section 6 contains the specification of all object types contained in
- this MIB module. The object types are defined using the conventions
- defined in the SMI, as amended by the extensions specified in RFC1212.
-
-
- 5. Overview
-
-
-
- The IP multicast forwarding mib is intended to provide a protocol
- independent method to monitor the IP multicast forwarding cache.
- Protocol dependent information (such as tunnels) should be stored in a
- protocol specific mib pointed to by ipMulticastForwardInfo.
-
- Each forwarding cache entry is identified by a Group Address, Source
- Network pair. The Source Network is described by the
- ipMulticastForwardSourceNet and ipMulticastForwardSourceMask variables.
- Each entry is also indexed by ipMulticastForwardPolicy to allow for
- different TOS requirements.
-
- For each entry there is an upstream interface and (downstream interface,
- TTL) pairs. This requires that the table be indexed by
- ipMultiDownstreamIfIndex to allow for forwarding the multicast datagram
- out multiple interfaces if they lie on the shortest path multicast tree.
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- 6. Definitions
-
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- IPMULTI-FORWARDING-MIB DEFINITIONS ::= BEGIN
-
- IMPORTS
- IpAddress, Counter, Gauge, experimental
- FROM RFC1155-SMI
- OBJECT-TYPE
- FROM RFC-1212;
-
- -- This MIB module defines an information base for the
- -- IP Multicast Forwarding Table.
- -- It is based on the specification found in RFC 1112.
-
- -- Please send any comments to Tom Pusateri (pusateri@cs.duke.edu).
-
- -- Thanks to John Moy and Greg Minshall for their review and comments.
- -- $Id: ipmultiforward.mib,v 1.5 1993/06/23 02:19:47 pusateri Exp $
-
- ipMulticastForward OBJECT IDENTIFIER ::= { experimental xxx }
-
- ipMulticastForwarding OBJECT-TYPE
- SYNTAX INTEGER {
- forwarding(1), -- acting as a multicast router
- not-forwarding(2) -- NOT acting as a multicast router
- }
- ACCESS read-write
- STATUS mandatory
- DESCRIPTION
- "The indication of whether this entity is acting as
- an IP Multicast gateway in respect to the forwarding
- of CLASS D datagrams received by this entity."
- ::= { ipMulticastForward 1 }
-
- ipMulticastForwardNumber OBJECT-TYPE
- SYNTAX Gauge
- ACCESS read-only
- STATUS mandatory
- DESCRIPTION
- "The number of current ipMulticastForwardTable entries
- that are not invalid."
- ::= { ipMulticastForward 2 }
-
- -- IP Multicast Forwarding Table
-
- ipMulticastForwardTable OBJECT-TYPE
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- SYNTAX SEQUENCE OF IpMulticastForwardEntry
- ACCESS not-accessible
- STATUS mandatory
- DESCRIPTION
- "This entity's IP Multicast forwarding table."
- ::= { ipMulticastForward 3 }
-
- ipMulticastForwardEntry OBJECT-TYPE
- SYNTAX IpMulticastForwardEntry
- ACCESS not-accessible
- STATUS mandatory
- DESCRIPTION
- "A forwarding entry based on source network/destination
- group under a particular policy."
- INDEX {
- ipMulticastForwardGroup,
- ipMulticastForwardSourceNet,
- ipMulticastForwardSourceMask,
- ipMulticastForwardPolicy,
- ipMultiDownstreamIfIndex
- }
- ::= { ipMulticastForwardTable 1 }
-
- IpMulticastForwardEntry ::=
- SEQUENCE {
- ipMulticastForwardGroup
- IpAddress,
- ipMulticastForwardSourceNet
- IpAddress,
- ipMulticastForwardSourceMask
- IpAddress,
- ipMultiUpstreamIfIndex
- INTEGER,
- ipMultiDownstreamIfIndex
- INTEGER,
- ipMultiDownstreamTTL
- INTEGER,
- ipMulticastForwardProto
- INTEGER,
- ipMulticastForwardPolicy
- INTEGER,
- ipMulticastForwardAge
- INTEGER,
- ipMulticastForwardedDatagrams
- Counter,
- ipMulticastForwardInfo
- OBJECT IDENTIFIER
- }
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- ipMulticastForwardGroup OBJECT-TYPE
- SYNTAX IpAddress
- ACCESS read-only
- STATUS mandatory
- DESCRIPTION
- "The destination IP Multicast Group Address. The
- range of this address is defined in RFC 1112. It
- is also referred to as a Class D address."
- ::= { ipMulticastForwardEntry 1 }
-
- ipMulticastForwardSourceNet OBJECT-TYPE
- SYNTAX IpAddress
- ACCESS read-only
- STATUS mandatory
- DESCRIPTION
- "The source address of the IP Mulicast datagram.
- This is required for Multicast Routing Protocol
- performing Reverse Path Forwarding."
- ::= { ipMulticastForwardEntry 2 }
-
- ipMulticastForwardSourceMask OBJECT-TYPE
- SYNTAX IpAddress
- ACCESS read-only
- STATUS mandatory
- DESCRIPTION
- "The source network mask of the IP Mulicast datagram.
- This is required for Multicast Routing Protocol
- performing Reverse Path Forwarding to uniquely
- identify the source network."
- ::= { ipMulticastForwardEntry 3 }
-
- ipMultiUpstreamIfIndex OBJECT-TYPE
- SYNTAX INTEGER
- ACCESS read-only
- STATUS mandatory
- DESCRIPTION
- "This value is a unique integer for each interface as
- identified by the same value of IfIndex. It specifies
- the interface an IP Multicast datagram is required to
- be received on in order to be forwarded to the
- downstream interface in the same entry of this table."
- ::= { ipMulticastForwardEntry 4 }
-
- ipMultiDownstreamIfIndex OBJECT-TYPE
- SYNTAX INTEGER
- ACCESS read-only
- STATUS mandatory
- DESCRIPTION
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- "This value is a unique integer for each interface as
- identified by the same value of IfIndex. It specifies
- the interface an IP Multicast datagram should be
- forwarded out of given that it was received on the
- upstream interface in the same entry of this table.
- Before forwarding occurs, the datagram's TTL field
- must also be greater than or equal to the TTL field
- in the same entry of this table."
- ::= { ipMulticastForwardEntry 5 }
-
- ipMultiDownstreamTTL OBJECT-TYPE
- SYNTAX INTEGER
- ACCESS read-only
- STATUS mandatory
- DESCRIPTION
- "The required minimum TTL for an IP Multicast Datagram
- to reach the closest group member. If the TTL value
- in the IP header of the IP Multicast datagram is not
- at least this large, there is no reason to further
- forward the datagram. This field is frequently used
- for locating resources using the expanding ring search."
- ::= { ipMulticastForwardEntry 6 }
-
- ipMulticastForwardProto OBJECT-TYPE
- SYNTAX INTEGER {
- other (1), -- not specified
- local (2), -- local interface
- netmgmt (3), -- static route
- dvmrp (4), -- Distance Vector Multicast Routing
- mospf (5) -- Multicast Open Shortest Path First
- }
- ACCESS read-only
- STATUS mandatory
- DESCRIPTION
- "The routing mechanism via which this route was
- learned."
- ::= { ipMulticastForwardEntry 7 }
-
- ipMulticastForwardPolicy OBJECT-TYPE
- SYNTAX INTEGER
- ACCESS read-only
- STATUS mandatory
- DESCRIPTION
- "The general set of conditions that would cause
- the selection of one multipath route (set of
- next hops for a given destination) is referred
- to as 'policy'.
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- Unless the mechanism indicated by ipForwardProto
- specifies otherwise, the policy specifier is the
- IP TOS Field. The encoding of IP TOS is as
- specified by the following convention. Zero
- indicates the default path if no more specific
- policy applies.
-
- +-----+-----+-----+-----+-----+-----+-----+-----+
- | | | |
- | PRECEDENCE | TYPE OF SERVICE | 0 |
- | | | |
- +-----+-----+-----+-----+-----+-----+-----+-----+
-
- IP TOS IP TOS
- Field Policy Field Policy
- Contents Code Contents Code
- 0 0 0 0 ==> 0 0 0 0 1 ==> 2
- 0 0 1 0 ==> 4 0 0 1 1 ==> 6
- 0 1 0 0 ==> 8 0 1 0 1 ==> 10
-
-
- 0 1 1 0 ==> 12 0 1 1 1 ==> 14
- 1 0 0 0 ==> 16 1 0 0 1 ==> 18
- 1 0 1 0 ==> 20 1 0 1 1 ==> 22
- 1 1 0 0 ==> 24 1 1 0 1 ==> 26
- 1 1 1 0 ==> 28 1 1 1 1 ==> 30
-
- Protocols defining 'policy' otherwise must either
- define a set of values which are valid for this
- object or must implement an integer-instanced
- policy table for which this object's value acts
- as an index."
- ::= { ipMulticastForwardEntry 8 }
-
- ipMulticastForwardAge OBJECT-TYPE
- SYNTAX INTEGER
- ACCESS read-only
- STATUS mandatory
- DESCRIPTION
- "The number of seconds since this route was
- last updated or otherwise determined to be
- correct. Note that no semantics of `too old'
- can be implied except through knowledge of the
- routing protocol by which the route was
- learned."
- DEFVAL { 0 }
- ::= { ipMulticastForwardEntry 9 }
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- ipMulticastForwardedDatagrams OBJECT-TYPE
- SYNTAX Counter
- ACCESS read-only
- STATUS mandatory
- DESCRIPTION
- "The number of IP Multicast datagrams that have
- been forwarded from the upstream interface listed
- in this entry to the downstream interface listed
- in this entry. Note that because there could be
- multiple downstream interfaces in this table for
- the same (source network, destination group), this
- number may not be the same as the number of
- IP multicast datagrams received on the upstream
- interface for a particular (source network, destination
- group)."
- ::= { ipMulticastForwardEntry 10 }
-
- ipMulticastForwardInfo OBJECT-TYPE
- SYNTAX OBJECT IDENTIFIER
- ACCESS read-write
- STATUS mandatory
- DESCRIPTION
- "A reference to MIB definitions specific to the
- particular routing protocol which is responsible
- for this route, as determined by the value specified
- in the route's ipMulticastForwardProto value. If
- this information is not present, its value
- should be set to the OBJECT IDENTIFIER { 0 0 },
- which is a syntactically valid object identifier,
- and any implementation conforming to ASN.1
- and the Basic Encoding Rules must be able to
- generate and recognize this value."
- DEFVAL { { 0 0 } } -- 0.0
- ::= { ipMulticastForwardEntry 11 }
- END
-
-
- 7. Acknowledgments
-
-
-
- The author would like to thank John Moy and Greg Minshall for their
- review and constructive comments.
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- INTERNET DRAFT February 1993
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- Author's Address:
-
- Thomas J. Pusateri
- Consultant
- 11820 Edgewater Ct.
- Raleigh, NC 27614
-
- pusateri@cs.duke.edu
-
-
- 8.0 References
-
-
-
- [1] S. Deering, Host Extensions for IP Multicasting, Internet Working
- Group Request for Comments 1112. Network Information Center, SRI
- International, Menlo Park, California, (Aug, 1989).
-
-
- [2] M.T. Rose and K. McCloghrie, Structure and Identification of
- Management Information for TCP/IP-based internets, Internet Working
- Group Request for Comments 1155. Network Information Center, SRI
- International, Menlo Park, California, (May, 1990).
-
-
- [3] M.T. Rose, Concise MIB definitions Internet Working Group Request
- for Comments 1212. Network Information Center, SRI International,
- Menlo Park, California, (March, 1991).
-
-
- [4] K. McCloghrie and M.T. Rose, Management Information Base for
- Network Management of TCP/IP-based internets, Internet Working
- Group Request for Comments 1156. Network Information Center, SRI
- International, Menlo Park, California, (May, 1990).
-
-
- [5] M.T. Rose (editor), Management Information Base for Network
- Management of TCP/IP-based internets, Internet Working Group
- Request for Comments 1213. Network Information Center, SRI
- International, Menlo Park, California, (March, 1991).
-
-
- [6] J.D. Case, M.S. Fedor, M.L. Schoffstall, and J.R. Davin, Simple
- Network Management Protocol, Internet Working Group Request for
- Comments 1157. Network Information Center, SRI International,
- Menlo Park, California, (May, 1990).
-
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- [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).
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