rfc1749.txt
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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.
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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:
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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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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 }
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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 {
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