Internet Draft Network Services Monitoring MIB Ned Freed Steve Kille MADMAN Working Group August 18, 1993 Expires: February 18, 1994 1. Status of this Memo 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." To learn the current status of any Internet-Draft, please check the 1id-abstracts.txt listing contained in the Internet-Drafts Shadow Directories on ds.internic.net, nic.nordu.net, ftp.nisc.sri.com, or munnari.oz.au. 2. Abstract This document defines the generic part of a MIB suitable for monitoring applications which provide some variety of network service. This MIB is intended to be extended to accomodate monitoring specific to a given type of service, for example, a Message Transfer Agent (MTA) service or a Directory Service Agent (DSA) service. 3. The SNMPv2 Network Management Framework The SNMPv2 Network Management Framework consists of four major components. They are: o RFC 1442 which defines the SMI, the mechanisms used for describing and naming objects for the purpose of management. o RFC 1213 defines MIB-II, the core set of managed objects for the Internet suite of protocols. o RFC 1445 which defines the administrative and other architectural aspects of the framework. o RFC 1448 which defines the protocol used for network access to managed objects. The Framework permits new objects to be defined for the purpose of experimentation and evaluation. 3.1 Object Definitions 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) defined in the SMI. In particular, each object object type is named by an OBJECT IDENTIFIER, an administratively assigned name. 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 descriptor, to refer to the object type. 4. Rationale for having a Network Services Monitoring MIB Much effort has been expended in developing tools to manage lower layer network facilities. However, relatively little work has been done on managing application layer entities. It is neither efficient nor reasonable to manage all aspects of application layer entities using only lower layer information. Moreover, the difficulty of managing application entities in this way increases dramatically as application entities become more complex. This leads to a substantial need to monitor applications which provide network services, particularly distributed components such as MTAs and DSAs, by monitoring specific aspects of the application itself. Reasons to monitor such components include but are not limited to measuring load, detecting broken connectivity, isolating system failures, and locating congestion. In order to manage network service applications effectively two requirements must be met: (1) It must be possible to monitor a large number of components (typical for a large organization). (2) Application monitoring must be integrated into general network management. SNMP is the clear choice for this sort of monitoring. At present only simple read-only access is defined; this is sufficient to determine up/down status and provide an indication of a broad class of operational problems. 4.1 Restriction of Scope The framework provided here is very minimal; there is a lot more that could be done. For example: (1) General network service application configuration monitoring and control. (2) Detailed examination and modification of individual entries in service-specific request queues. (3) Probing to determine the status of a specific request (e.g. the location of a mail message with a specific message-id). (4) Requesting that certain actions be performed (e.g. forcing an immediate connection and transfer of pending messages to some specific system). All these capabilities are both impressive and useful. However, these capabilities would require provisions for strict security checking. These capabilities would also mandate a much more complex design, with many characteristics likely to be fairly implementation-specific. As a result such facilities are likely to be both contentious and difficult to implement. This document religiously keeps things simple and focuses on the basic monitoring aspect of managing applications providing network services. The goal here is to provide a framework which is simple, useful, and widely implementable. 4.2 Relationship to Directory Services Use of and management of directory services already is tied up with network service application management. There are clearly many things which could be dealt with by directory services and protocols. We take the line here that static configuration information is both provided by and dealt with by directory services and protocols. The emphasis here is on transient application status. By placing static information in the directory, the richness and linkage of the directory information framework does not need to be repeated in the MIB. Static information is information which has a mean time to change of the order of days or longer. When network service applications that employ directory services are monitored, it is recommend that a linkage be established, so that: (1) The managed object contains its own directory name. This allows all directory information to be obtained by reference. This will let a SNMP monitor capable of performing directory queries present this information to the manager in an appropriate format. It is intended that this will be the normal case. (2) The directory will reference the location of the SNMP agent, so that an SNMP capable directory query agent could probe dynamic characteristics of the object. (3) This approach could be extended further, so that the SNMP attributes are modelled as directory attributes. This would dramatically simplify the design of directory service agents that use SNMP to obtain the information they need. 5. Application Objects This MIB starts with a set of general purpose attributes which would be appropriate for a range of applications that provide network services. Both OSI and non-OSI services can be accomodated. Additional tables defined in extensions to this MIB provide attributes specific to specific network services. A table is defined which will have one row for each network service application running on the system. The only static information held on the application is its name. All other static information should be obtained from various directory services. The applName is an external key, which allows an SNMP MIB entry to be cleanly related to the X.500 Directory. In SNMP terms, the applications are grouped in a table called applTable, which is indexed by an integer key applIndex. The type of the application will be determined by one or both of: (1) Additional MIB variables specific to the applications. (2) An association to the application of a specific protocol. 6. The Application MIB APPLICATION-MIB DEFINITIONS ::= BEGIN IMPORTS OBJECT-TYPE, experimental, Counter32, Gauge32 FROM SNMPv2-SMI DisplayString, TimeStamp FROM SNMPv2-TC; application MODULE-IDENTITY LAST-UPDATED "" ORGANIZATION "IETF Mail and Directory Management Working Group" CONTACT-INFO " Ned Freed Postal: Innosoft International, Inc. 250 West First Street, Suite 240 Claremont, CA 91711 US Tel: +1 909 624 7907 Fax: +1 909 621 5319 E-Mail: ned@innosoft.com" DESCRIPTION "The MIB module describing network service applications" ::= {experimental 46} applObjects OBJECT IDENTIFIER ::= {application 1} -- The basic applTable contains a list of the application -- entities. applTable OBJECT-TYPE SYNTAX SEQUENCE OF ApplEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The table holding objects which apply to all different kinds of applications providing network services." ::= {applObjects 1} applEntry OBJECT-TYPE SYNTAX ApplEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry associated with a network service application." INDEX {applIndex} ::= {applTable 1} ApplEntry ::= SEQUENCE { applIndex INTEGER, applName DisplayString, applVersion DisplayString, applUptime TimeStamp, applOperStatus INTEGER, applLastChange TimeStamp, applInboundAssociations Gauge32, applOutboundAssociations Gauge32, applAccumulatedInboundAssociations Counter32, applAccumulatedOutboundAssociations Counter32, applLastInboundActivity TimeStamp, applLastOutboundActivity TimeStamp, applRejectedInboundAssociations Counter32, applFailedOutboundAssociations Counter32 } applIndex OBJECT-TYPE SYNTAX INTEGER (1..2147483647) MAX-ACCESS not-accessible STATUS current DESCRIPTION "An index to uniquely identify the network service application." ::= {applEntry 1} applName OBJECT-TYPE SYNTAX DisplayString MAX-ACCESS read-only STATUS current DESCRIPTION "The name the network service application chooses to be known by." ::= {applEntry 2} applVersion OBJECT-TYPE SYNTAX DisplayString MAX-ACCESS read-only STATUS current DESCRIPTION "The version of network service application software." ::= {applEntry 3} applUptime OBJECT-TYPE SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime at the time the network service application was last initialized. If the application was last initialized prior to the last initialization of the network management subsystem, then this object contains a zero value." ::= {applEntry 4} applOperStatus OBJECT-TYPE SYNTAX INTEGER { up(1), down(2), halted(3), congested(4), restarting(5) } MAX-ACCESS read-only STATUS current DESCRIPTION "Indicates the operational status of the network service application. 'down' indicates that the network service is not available. 'running' indicates that the network service is operational and available. 'halted' indicates that the service is operational but not available. 'congested' indicates that the service is operational but no additional inbound associations can be accomodated. 'restarting' indicates that the service is currently unavailable but is in the process of restarting and will be available soon." ::= {applEntry 5} applLastChange OBJECT-TYPE SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime at the time the network service application entered its current operational state. If the current state was entered prior to the last initialization of the local network management subsystem, then this object contains a zero value." ::= {applEntry 6} applInboundAssociations OBJECT-TYPE SYNTAX Gauge32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of current associations to the network service application, where it is the responder. For dynamic single threaded processes, this will be the number of application instances." ::= {applEntry 7} applOutboundAssociations OBJECT-TYPE SYNTAX Gauge32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of current associations to the network service application, where it is the initiator. For dynamic single threaded processes, this will be the number of application instances." ::= {applEntry 8} applAccumulatedInboundAssociations OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of associations to the application entity since application initialization, where it was the responder. For dynamic single threaded processes, this will be the number of application instances." ::= {applEntry 9} applAccumulatedOutboundAssociations OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of associations to the application entity since application initialization, where it was the initiator. For dynamic single threaded processes, this will be the number of application instances." ::= {applEntry 10} applLastInboundActivity OBJECT-TYPE SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime at the time this application last had an inbound association. If the last association occurred prior to the last initialization of the network subsystem, then this object contains a zero value." ::= {applEntry 11} applLastOutboundActivity OBJECT-TYPE SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime at the time this application last had an outbound association. If the last association occurred prior to the last initialization of the network subsystem, then this object contains a zero value." ::= {applEntry 12} applRejectedInboundAssociations OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of inbound associations the application entity has rejected, since application initialization." ::= {applEntry 13} applFailedOutboundAssociations OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number associations where the application entity is initiator and association establishment has failed, since application initialization." ::= {applEntry 14} -- assocTable augments the information in applTable with data -- about associations. This is treated as a separate group to -- the basic application table. Where simplified appplication -- monitoring is needed, the assocTable group may be omitted. -- This table is indexed by applIndex and assocIndex, with the -- application index coming first. assocTable OBJECT-TYPE SYNTAX SEQUENCE OF AssocEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The table holding a set of all active application associations." ::= {applObjects 2} assocEntry OBJECT-TYPE SYNTAX AssocEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry associated with an association for a network service application." INDEX {applIndex, assocIndex} ::= {assocTable 1} AssocEntry ::= SEQUENCE { assocIndex INTEGER, assocRemoteApplication DisplayString, assocApplicationProtocol OBJECT IDENTIFIER, assocApplicationType INTEGER, assocDuration TimeStamp } assocIndex OBJECT-TYPE SYNTAX INTEGER (1..2147483647) MAX-ACCESS not-accessible STATUS current DESCRIPTION "An index to uniquely identify each association for a network service application." ::= {assocEntry 1} assocRemoteApplication OBJECT-TYPE SYNTAX DisplayString MAX-ACCESS read-only STATUS current DESCRIPTION "The name of the system running remote network service application. For an IP-based application this should be either a domain name or IP address. For an OSI application it should be the string encoded distinguished name of the managed object. For X.400(84) MTAs which do not have a Distinguished Name, the RFC-1327 syntax 'mta in globalid' should be used." ::= {assocEntry 2} assocApplicationProtocol OBJECT-TYPE SYNTAX OBJECT IDENTIFIER MAX-ACCESS read-only STATUS current DESCRIPTION "An identification of the protocol being used for the application. For an OSI Application, this will be the Application Context. For Internet applications, the IANA maintains a registry of the OIDs which correspond to well-known applications. If the application protocol is not listed in the registry, the value {applProtoID port} is used where 'port' corresponds to primary port being used by the application." ::= {assocEntry 3} assocApplicationType OBJECT-TYPE SYNTAX INTEGER { ua-initiator(1), ua-responder(2), peer-initiator(3), peer-responder(4) } MAX-ACCESS read-only STATUS current DESCRIPTION "Shows whether the remote application is a User Agent, or a peer server, and whether the remote end is initiator or responder." ::= {assocEntry 4} assocDuration OBJECT-TYPE SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime at the time this association was started. If this association started prior to the last initialization of the network subsystem, then this object contains a zero value." ::= {assocEntry 5} -- Conformance information applConformance OBJECT IDENTIFIER ::= {application 2} applGroups OBJECT IDENTIFIER ::= {applConformance 1} applCompliances OBJECT IDENTIFIER ::= {applConformance 2} -- Compliance statements applCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION "The compliance statement for SNMPv2 entities which implement the Network Services Monitoring MIB for basic monitoring of network service applications." MODULE -- this module MANDATORY-GROUPS {applGroup} ::= {applCompliances 1} assocCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION "The compliance statement for SNMPv2 entities which implement the Network Services Monitoring MIB for basic monitoring of network service applications and their associations." MODULE -- this module MANDATORY-GROUPS {applGroup, assocGroup} ::= {applCompliances 2} -- Units of conformance applGroup OBJECT-GROUP OBJECTS { applIndex, applName, applVersion, applUptime, applOperStatus, applLastChange, applInboundAssociations, applOutboundAssociations, applAccumulatedInboundAssociations, applAccumulatedOutboundAssociations, applLastInboundActivity, applLastOutboundActivity, applRejectedInboundAssociations, applFailedOutboundAssociations } STATUS current DESCRIPTION "A collection of objects providing basic monitoring of network service applications." ::= {applGroups 1} assocGroup OBJECT-GROUP OBJECTS { assocIndex, assocRemoteApplication, assocApplicationProtocol, assocApplicationType, assocDuration } STATUS current DESCRIPTION "A collection of objects providing basic monitoring of network service applications' associations." ::= {applGroups 2} -- Values of the form { applProtoID port } are used for -- protocols that don't have assigned OIDs. 'port' -- corresponds to primary port being used by the -- application. applProtoID OBJECT IDENTIFIER ::= {application 3} END Expires: February 18, 1994