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- Network Working Group K. McCloghrie
- Request for Comments: 1749 F. Baker
- Updates: 1748 E. Decker
- Category: Standards Track cisco Systems, Inc.
- December 1994
-
-
- IEEE 802.5 Station Source Routing MIB using SMIv2
-
- 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.
-
- Table of Contents
-
- 1. Introduction ............................................. 1
- 2. The SNMPv2 Network Management Framework .................. 2
- 2.1 Object Definitions ...................................... 2
- 3. Overview ................................................. 2
- 3.1 Source Routing .......................................... 2
- 3.2 Relationship to RFC 1748 ................................ 3
- 3.3 Relationship to RFC 1525 ................................ 3
- 3.4 Static Source Routes .................................... 4
- 3.5 Destinations on the Local Ring .......................... 4
- 4. Definitions .............................................. 4
- 5. Acknowledgements ......................................... 8
- 6. References ............................................... 8
- 7. Security Considerations .................................. 9
- 8. Authors' Addresses ....................................... 10
-
- 1. Introduction
-
- This memo defines a portion of the Management Information Base (MIB)
- for use with network management protocols in the Internet community.
- In particular, it describes managed objects used by IEEE 802.5 end-
- stations for managing source routes on a Token Ring network where
- IEEE source-routing is in use. IEEE source-routing is described in
- 802.5 Token Ring Access Method and Physical Layer Specifications [8]
- and related ISO publications [9, 10, 11].
-
- This memo is an incremental update to RFC 1748 [6]. It is documented
- separately from the RFC 1748 solely due to the latter's maturity
- within the Internet standardization process.
-
-
-
-
- McCloghrie, Baker & Decker [Page 1]
-
- RFC 1749 802.5 Station Source Routing MIB using SMIv2 December 1994
-
-
- 2. The SNMPv2 Network Management Framework
-
- The SNMPv2 Network Management Framework consists of four major
- components. They are:
-
- o RFC 1442 [1] which defines the SMI, the mechanisms used for
- describing and naming objects for the purpose of management.
-
- o STD 17, RFC 1213 [2] defines MIB-II, the core set of managed
- objects for the Internet suite of protocols.
-
- o RFC 1445 [3] which defines the administrative and other
- architectural aspects of the framework.
-
- o RFC 1448 [4] 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.
-
- 2.1. 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 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.
-
- 3. Overview
-
- This memo defines a single table: the 802.5 Station Source Routing
- Table, which contains the source routes known by a end-station on an
- IEEE 802.5 Token Ring network in which IEEE source-routing is in use.
-
- 3.1. Source Routing
-
- Source routing extends the 802.5 protocol [8] by assigning a unique
- ring number to each ring within the extended LAN, and a bridge number
- to each source routing bridge's connection to a ring. A Routing
- Information Field (RIF) must be included in frames which need to
- traverse multiple rings. The format of the RIF is:
-
-
-
-
-
-
- McCloghrie, Baker & Decker [Page 2]
-
- RFC 1749 802.5 Station Source Routing MIB using SMIv2 December 1994
-
-
- octets octets octets octets
- 1&2 3&4 5&6 17&18
- +------+------+------+-------+------+
- | RC | RD | RD | ... | RD |
- +------+------+------+-------+------+
- <---- 0 to 8 RD fields ---->
-
- The format of the Routing Control (RC) field is:
-
- octet 1 octet 2
- +---------------+---------------+
- |b b b l l l l l|d f f f 0 0 0 0|
- +---------------+---------------+
- ^ ^ ^ ^
- | | | |
- Explorer indicator --+ | | +-- Max frame length*
- Length of RIF field --+ +-- Direction to use RDs
-
- * Note that the length of the Maximum frame length subfield
- has recently been extended to 6 bits.
-
- The format of each Routing Descriptor (RD) field is:
-
- octet 1 octet 2
- +---------------+---------------+
- |r r r r r r r r r r r r i i i i|
- +---------------+---------------+
- <---- ring number ----> <----->
- ^
- |
- bridge number --+
-
- 3.2. Relationship to RFC 1748
-
- RFC 1748 [6], the IEEE 802.5 MIB, defines managed objects used for
- interfaces to IEEE 802.5 Token Ring subnetworks. This memo is an
- incremental update to RFC 1748, and is documented independently
- solely due to the maturity of the definitions contained within RFC
- 1748.
-
- 3.3. Relationship to RFC 1525
-
- RFC 1525 [7] defines the MIB objects specific to source-routing for
- source-routing and SRT bridges. This memo defines the MIB objects
- specific to source-routing for source-routing end-stations.
-
-
-
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-
- McCloghrie, Baker & Decker [Page 3]
-
- RFC 1749 802.5 Station Source Routing MIB using SMIv2 December 1994
-
-
- 3.4. Static Source Routes
-
- It is unclear how many, if any, existing systems allow the creation
- or deletion of "static" 802.5 source routes by network management.
- However, SNMPv2 SMI defines that the MAX-ACCESS clause as specifying
- the maximal level of access which makes "protocol sense". Thus, this
- memo provides support for static source routes through the
- dot5SrRouteStatus object, but the conformance statements allow for
- stations which do not support static source routes, by requiring that
- compliant agents only need provide read-access to dot5SrRouteStatus.
-
- 3.5. Destinations on the Local Ring
-
- Entries should be included in the dot5SrRouteTable for destination
- MAC addresses which are on the same ring as the instrumented 802.5
- interface. For such entries, dot5SrRouteDescr has the value of the
- zero-length string, and dot5SrRouteControl has the corresponding
- value.
-
- 4. Definitions
-
- TOKENRING-STATION-SR-MIB DEFINITIONS ::= BEGIN
-
- IMPORTS
- MODULE-IDENTITY, OBJECT-TYPE
- FROM SNMPv2-SMI
- TEXTUAL-CONVENTION, RowStatus, MacAddress
- FROM SNMPv2-TC
- MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF
- mib-2, ifIndex FROM RFC1213-MIB;
-
- dot5SrMIB MODULE-IDENTITY
- LAST-UPDATED "9412161000Z"
- ORGANIZATION "IETF Interfaces MIB Working Group"
- CONTACT-INFO
- " Keith McCloghrie
- Postal: Cisco Systems, Inc.
- 170 West Tasman Drive
- San Jose, CA 95134-1706
- US
-
- Phone: +1 408 526 5260
- Email: kzm@cisco.com"
- DESCRIPTION
- "The MIB module for managing source routes in
- end-stations on IEEE 802.5 Token Ring networks."
- ::= { mib-2 42 }
-
-
-
-
- McCloghrie, Baker & Decker [Page 4]
-
- RFC 1749 802.5 Station Source Routing MIB using SMIv2 December 1994
-
-
- dot5SrMIBObjects OBJECT IDENTIFIER ::= { dot5SrMIB 1 }
-
- SourceRoute ::= TEXTUAL-CONVENTION
- DISPLAY-HINT "1x:"
- STATUS current
- DESCRIPTION
- "Represents a Source Route, containing an
- embedded sequence of bridge and ring ID's,
- as used by 802.5 Source Routing."
- REFERENCE "Annex C of ISO/IEC 10038: 1993,
- [ANSI/IEEE Std 802.1D, 1993]"
- SYNTAX OCTET STRING (SIZE(0..30))
-
-
- -- The 802.5 Station Source Route Table
- --
-
- dot5SrRouteTable OBJECT-TYPE
- SYNTAX SEQUENCE OF Dot5SrRouteEntry
- MAX-ACCESS not-accessible
- STATUS current
- DESCRIPTION
- "The table of source-routing routes.
- This represents the 802.5 RIF database."
- ::= { dot5SrMIBObjects 1 }
-
- dot5SrRouteEntry OBJECT-TYPE
- SYNTAX Dot5SrRouteEntry
- MAX-ACCESS not-accessible
- STATUS current
- DESCRIPTION
- "Information on a specific route.
-
- An entry is created whenever a 'Single Path
- Explorer' or an 'All Paths Explorer' discovers
- a route to a neighbor not currently in the table,
- or whenever an 'All Paths Explorer' discovers a
- better (e.g., shorter) route than the route currently
- stored in the table. This is done on behalf of
- any network layer client.
-
- The ifIndex value in the INDEX clause refers to
- the value of MIB-II's ifIndex object for the
- interface on which the route is in effect."
- INDEX { ifIndex, dot5SrRouteDestination }
- ::= { dot5SrRouteTable 1 }
-
- Dot5SrRouteEntry ::= SEQUENCE {
-
-
-
- McCloghrie, Baker & Decker [Page 5]
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- RFC 1749 802.5 Station Source Routing MIB using SMIv2 December 1994
-
-
- dot5SrRouteDestination MacAddress,
- dot5SrRouteControl OCTET STRING,
- dot5SrRouteDescr SourceRoute,
- dot5SrRouteStatus RowStatus
- }
-
- dot5SrRouteDestination OBJECT-TYPE
- SYNTAX MacAddress
- MAX-ACCESS not-accessible
- STATUS current
- DESCRIPTION
- "The destination of this route."
- ::= { dot5SrRouteEntry 2 }
-
- dot5SrRouteControl OBJECT-TYPE
- SYNTAX OCTET STRING (SIZE(2))
- MAX-ACCESS read-create
- STATUS current
- DESCRIPTION
- "The value of Routing Control field for this
- route."
- REFERENCE "Annex C of ISO/IEC 10038: 1993,
- [ANSI/IEEE Std 802.1D, 1993]"
- ::= { dot5SrRouteEntry 3 }
-
- dot5SrRouteDescr OBJECT-TYPE
- SYNTAX SourceRoute
- MAX-ACCESS read-create
- STATUS current
- DESCRIPTION
- "The embedded sequence of bridge and ring ID's
- for this route. For destinations on the
- local ring, the value of this object is
- the zero-length string."
- REFERENCE "Annex C of ISO/IEC 10038: 1993,
- [ANSI/IEEE Std 802.1D, 1993]"
- ::= { dot5SrRouteEntry 4 }
-
- dot5SrRouteStatus OBJECT-TYPE
- SYNTAX RowStatus
- MAX-ACCESS read-create
- STATUS current
- DESCRIPTION
- "The status of this row. Values of the instances
- of dot5SrRouteControl and dot5SrRouteDescr can be
- modified while the row's status is 'active."
- ::= { dot5SrRouteEntry 5 }
-
-
-
-
- McCloghrie, Baker & Decker [Page 6]
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- RFC 1749 802.5 Station Source Routing MIB using SMIv2 December 1994
-
-
- -- conformance information
-
- dot5SrConformance OBJECT IDENTIFIER ::= { dot5SrMIB 2 }
-
- dot5SrGroups OBJECT IDENTIFIER ::= { dot5SrConformance 1 }
- dot5SrCompliances OBJECT IDENTIFIER ::= { dot5SrConformance 2 }
-
-
- -- compliance statements
-
- dot5SrCompliance MODULE-COMPLIANCE
- STATUS current
- DESCRIPTION
- "The compliance statement for SNMPv2 entities
- which implement the IEEE 802.5 Station Source Route
- MIB."
-
- MODULE -- this module
- MANDATORY-GROUPS { dot5SrRouteGroup }
-
- OBJECT dot5SrRouteStatus
- SYNTAX INTEGER { active(1) } -- subset of values
- MIN-ACCESS read-only
- DESCRIPTION
- "Write access is not required, and only the 'active'
- value need be supported."
-
- OBJECT dot5SrRouteControl
- MIN-ACCESS read-only
- DESCRIPTION
- "Write access is not required."
-
- OBJECT dot5SrRouteDescr
- MIN-ACCESS read-only
- DESCRIPTION
- "Write access is not required."
-
- ::= { dot5SrCompliances 1 }
-
-
- -- units of conformance
-
- dot5SrRouteGroup OBJECT-GROUP
- OBJECTS { dot5SrRouteControl,
- dot5SrRouteDescr,
- dot5SrRouteStatus
- }
- STATUS current
-
-
-
- McCloghrie, Baker & Decker [Page 7]
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- RFC 1749 802.5 Station Source Routing MIB using SMIv2 December 1994
-
-
- DESCRIPTION
- "A collection of objects providing for the management of
- source routes in stations on IEEE 802.5 source-routing
- networks."
- ::= { dot5SrGroups 1 }
-
- END
-
- 5. Acknowledgements
-
- The need for this MIB module was agreed upon by the members of the
- IETF Interfaces Working Group, and the definitions were derived from
- experience with enterprise-specific MIBs presented to the Working
- Group.
-
- 6. References
-
- [1] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Structure
- of Management Information for version 2 of the Simple Network
- Management Protocol (SNMPv2)", RFC 1442, SNMP Research,Inc.,
- Hughes LAN Systems, Dover Beach Consulting, Inc., Carnegie Mellon
- University, April 1993.
-
- [2] McCloghrie, K., and M. Rose, Editors, "Management Information
- Base for Network Management of TCP/IP-based internets: MIB- II",
- STD 17, RFC 1213, Hughes LAN Systems, Performance Systems
- International, March 1991.
-
- [3] Galvin, J., and K. McCloghrie, "Administrative Model for version
- 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1445,
- Trusted Information Systems, Hughes LAN Systems, April 1993.
-
- [4] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Protocol
- Operations for version 2 of the Simple Network Management
- Protocol (SNMPv2)", RFC 1448, SNMP Research,Inc., Hughes LAN
- Systems, Dover Beach Consulting, Inc., Carnegie Mellon
- University, April 1993.
-
- [5] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Textual
- Conventions for version 2 of the Simple Network Management
- Protocol (SNMPv2)", RFC 1443, SNMP Research Inc., Hughes LAN
- Systems, Dover Beach Consulting, Inc., Carnegie Mellon
- University, April 1993.
-
- [6] McCloghrie, K., and E. Decker, "IEEE 802.5 Token Ring MIB using
- SMIv2", RFC 1748 cisco Systems, Inc., December 1994.
-
-
-
-
-
- McCloghrie, Baker & Decker [Page 8]
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- RFC 1749 802.5 Station Source Routing MIB using SMIv2 December 1994
-
-
- [7] McCloghrie, K., Decker, E., Langville, P., and A. Rijsinghani,
- "Definitions of Managed Objects for Source Routing Bridges", RFC
- 1525, Hughes LAN Systems, cisco Systems, Inc., Digital Equipment
- Corporation, September 1993.
-
- [8] "Token Ring Access Method and Physical Layer Specifications",
- IEEE Standard 802.5-1989, 1989.
-
- [9] "Information technology - Local and metropolitan area networks -
- Part 5: Token ring access method and physical layer
- specifications", ISO/IEC 8802-5, 1992.
-
- [10] "Information technology - Telecommunications and information
- exchange between systems - Local area networks - Media access
- control (MAC) bridges", ISO/IEC 10038, 1993 [ANSI/IEEE Std
- 802.1D, 1993 Edition].
-
- [11] "Source Routing Operation by End Systems", ISO/IEC 8802-2 PDAM5.3
- (6N7721).
-
- 7. Security Considerations
-
- Security issues are not discussed in this memo.
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- McCloghrie, Baker & Decker [Page 9]
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- RFC 1749 802.5 Station Source Routing MIB using SMIv2 December 1994
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- 8. Authors' Addresses
-
- Keith McCloghrie
- cisco Systems, Inc.
- 170 West Tasman Drive,
- San Jose CA 95134-1706.
-
- Phone: (408) 526-5260
- EMail: kzm@cisco.com
-
-
- Fred Baker
- cisco Systems, Inc.
- 519 Lado Drive
- Santa Barbara, CA 93111
-
- Phone: (805) 681-0115
- EMail: fred@cisco.com
-
-
- Eric B. Decker
- cisco Systems, Inc.
- 1525 O'Brien Dr.
- Menlo Park, California 94025
-
- Phone: (415) 688-8241
- EMail: cire@cisco.com
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