Network Working Group F. Baker
Request for Comments: 2096 Cisco Systems
Obsoletes: 1354 January 1997
Category: Standards Track
IP Forwarding Table MIB
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 SNMP Network Management Framework ................. 2
2.1 Object Definitions ................................... 2
3. Overview .............................................. 2
4. Definitions ........................................... 3
5. Acknowledgements ...................................... 20
6. References ............................................ 20
7. Security Considerations ............................... 21
8. Author's Address ...................................... 21
1. Introduction
This memo defines an update to RFC 1354, "IP Forwarding Table MIB",
for Classless Inter-Domain Routing (CIDR). That document was
developed by the Router Requirements Working Group as an update to
RFC 1213's ipRouteTable, with the display of multiple routes as
a primary objective. The significant difference between this MIB and
RFC 1354 is the recognition (explicitly discussed but by consensus
left to future work) that CIDR routes may have the
same network number but different network masks. Note that this MIB
obsoletes a number of objects from RFC 1354. The reader should pay
careful attention to the STATUS field.
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RFC 2096 IP Forwarding Table MIB January 1997
2. The SNMP Network Management Framework
The SNMP Network Management Framework presently consists of three
major components. They are:
o the SMI, described in RFC 1902 [1], - the mechanisms used
for describing and naming objects for the purpose of
management.
o the MIB-II, STD 17, RFC 1213 [2], - the core set of
managed objects for the Internet suite of protocols.
o the protocol, RFC 1157 [6] and/or RFC 1905 [4], - the
protocol for accessing managed information.
Textual conventions are defined in RFC 1903 [3], and conformance
statements are defined in RFC 1904 [5].
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 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
The MIB consists of two tables and two global objects.
(1) The object ipForwardNumber indicates the number of
current routes. This is primarily to avoid having to
read the table in order to determine this number.
(2) The ipForwardTable updates the RFC 1213 ipRouteTable to
display multipath IP Routes. This is in turn obsoleted
by the ipCidrRouteTable.
(3) The ipCidrRouteTable updates the RFC 1213 ipRouteTable to
display multipath IP Routes having the same network
number but differing network masks.
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RFC 2096 IP Forwarding Table MIB January 1997
4. Definitions
IP-FORWARD-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, IpAddress, Integer32, Gauge32
FROM SNMPv2-SMI
RowStatus
FROM SNMPv2-TC
ip
FROM RFC1213-MIB
MODULE-COMPLIANCE, OBJECT-GROUP
FROM SNMPv2-CONF;
ipForward MODULE-IDENTITY
LAST-UPDATED "9609190000Z" -- Thu Sep 26 16:34:47 PDT 1996
ORGANIZATION "IETF OSPF Working Group"
CONTACT-INFO
" Fred Baker
Postal: Cisco Systems
datatracker.ietf.org