RFC1389 - RIP Version 2 MIB Extensions

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　　Network Working Group G. Malkin
Request for Comments: 1389 Xylogics, Inc.
F. Baker
Advanced Computer Communications
January 1993

RIP Version 2 MIB Extension

Status of this Memo

This RFCspecifies an IAB standards track protocol for the Internet
community, and requests discussion and suggestions for improvements.
Please refer to the current edition of the "IAB Official Protocol
Standards" for the standardization state and status of this protocol.
Distribution of this memo is unlimited.

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 RIP Version 2.

Table of Contents

1. The Network Management Framework ...................... 1
2. Objects ............................................... 2
2.1 Format of Definitions ................................ 2
3. Overview .............................................. 3
3.1 Textual Conventions .................................. 3
3.2 Structure of MIB ..................................... 3
4. Definitions ........................................... 3
4.1 Global Counters ...................................... 4
4.2 RIP Interface Tables ................................. 4
4.3 Peer Table ........................................... 10
5. Acknowledgements ...................................... 12
6. References ............................................ 12
7. Security Considerations ............................... 13
8. Authors' Addresses .................................... 13

1. The Network Management Framework

The Internet-standard Network Management Framework consists of three
components. They are:

STD 16/RFC1155 which defines the SMI, the mechanisms used for
describing and naming objects for the purpose of management. STD
16/RFC1212 defines a more concise description mechanism, which is

wholly consistent with the SMI.

RFC1156 which defines MIB-I, the core set of managed objects for
the Internet suite of protocols. STD 17/RFC1213 defines MIB-II,
an evolution of MIB-I based on implementation experience and new
operational requirements.

STD 15/RFC1157 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.

2. Objects

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 [3] 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 represented when being transmitted on the network.

The SMI specifies the use of the basic encoding rules of ASN.1 [8],
subject to the additional requirements imposed by the SNMP.

2.1 Format of Definitions

Section 4 contains 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 [9].

3. Overview

3.1 Textual Conventions

Several new data types are introduced as a textual convention in this
MIB document. These textual conventions enhance the readability of
the specification and can ease comparison with other specifications
if appropriate. It should be noted that the introduction of the
these textual conventions has no effect on either the syntax nor the
semantics of any managed objects. The use of these is merely an
artifact of the explanatory method used. Objects defined in terms of
one of these methods are always encoded by means of the rules that
define the primitive type. Hence, no changes to the SMI or the SNMP
are necessary to accommodate these textual conventions which are
adopted merely for the convenience of readers and writers in pursuit
of the elusive goal of clear, concise, and unambiguous MIB documents.

The new data types are: Validation (the standard "set to invalid
causes deletion" type), and RouteTag. The RouteTag type represents
the contents of the Route Tag field in the packet header or route
entry.

3.2 Structure of MIB

The RIP-2 MIB contains global counters useful for detecting the
deleterious effects of RIP incompatibilities, an "interfaces" table
which contains interface-specific statistics and configuration
information, and an optional "neighbor" table containing information
that may be helpful in debugging neighbor relationships. Like the
protocol itself, this MIB takes great care to preserve compatibility
with RIP-1 systems, and controls for monitoring and controlling
system interactions.

4. Definitions

RFC1389-MIB DEFINITIONS ::= BEGIN

IMPORTS
Counter, TimeTicks, IpAddress
FROM RFC1155-SMI
mib-2
FROM RFC1213-MIB
OBJECT-TYPE
FROM RFC-1212;

-- RIP-2 Management Information Base

rip2 OBJECT IDENTIFIER ::= { mib-2 23 }

-- the RouteTag type represents the contents of the
-- Route Tag field in the packet header or route entry.

RouteTag ::= OCTET STRING (SIZE (2))

-- the Validation type is used for the variable that deletes
-- an entry from a table, and ALWAYS takes at least these values:

Validation ::= INTEGER { valid (1), invalid (2) }

-- The RIP-2 Globals Group.
-- Implementation of this group is mandatory for systems that
-- implement RIP-2.

-- These counters are intended to facilitate debugging quickly
-- changing routes or failing neighbors

rip2GlobalGroup OBJECT IDENTIFIER ::= { rip2 1 }

rip2GlobalRouteChanges OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of changes made to the IP Route Da-
tabase by RIP."
::= { rip2GlobalGroup 1 }

rip2GlobalQueries OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of responses sent to RIP queries
from other systems."
::= { rip2GlobalGroup 2 }

-- RIP Interfaces Groups
-- Implementation of these Groups is mandatory for systems that
-- implement RIP-2.

-- Since RIP versions 1 and 2 do not deal with addressless links,
-- it is assumed that RIP "interfaces" are subnets within a
-- routing domain.

-- The RIP Interface Status Table.

rip2IfStatTable OBJECT-TYPE
SYNTAX SEQUENCE OF Rip2IfStatEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of subnets which require separate
status monitoring in RIP."
::= { rip2 2 }

rip2IfStatEntry OBJECT-TYPE
SYNTAX Rip2IfStatEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A Single Routing Domain in a single Subnet."
INDEX { rip2IfStatAddress }
::= { rip2IfStatTable 1 }

Rip2IfStatEntry ::=
SEQUENCE {
rip2IfStatAddress
IpAddress,
rip2IfStatRcvBadPackets
Counter,
rip2IfStatRcvBadRoutes
Counter,
rip2IfStatSentUpdates
Counter,
rip2IfStatStatus
Validation
}

rip2IfStatAddress OBJECT-TYPE
SYNTAX IpAddress
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The IP Address of this system on the indicated
subnet."
::= { rip2IfStatEntry 1 }

rip2IfStatRcvBadPackets OBJECT-TYPE
SYNTAX Counter
ACCESS read-only

STATUS mandatory
DESCRIPTION
"The number of RIP response packets received by
the RIP process which were subsequently dis-
carded for any reason (e.g. a version 0 packet,
or an unknown command type)."
::= { rip2IfStatEntry 2 }

rip2IfStatRcvBadRoutes OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of routes, in valid RIP packets,
which were ignored for any reason (e.g. unknown
address family, or invalid metric)."
::= { rip2IfStatEntry 3 }

rip2IfStatSentUpdates OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of triggered RIP updates actually
sent on this interface. This explicitly does
NOT include full updates sent containing new
information."
::= { rip2IfStatEntry 4 }

rip2IfStatStatus OBJECT-TYPE
SYNTAX Validation
ACCESS read-write
STATUS mandatory
DESCRIPTION
"Writing invalid has the effect of deleting
this interface."
DEFVAL { valid }
::= { rip2IfStatEntry 5 }

-- The RIP Interface Configuration Table.

rip2IfConfTable OBJECT-TYPE
SYNTAX SEQUENCE OF Rip2IfConfEntry
ACCESS not-accessible

STATUS mandatory
DESCRIPTION
"A list of subnets which require separate con-
figuration in RIP."
::= { rip2 3 }

rip2IfConfEntry OBJECT-TYPE
SYNTAX Rip2IfConfEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A Single Routing Domain in a single Subnet."
INDEX { rip2IfConfAddress }
::= { rip2IfConfTable 1 }

Rip2IfConfEntry ::=
SEQUENCE {
rip2IfConfAddress
IpAddress,
rip2IfConfDomain
RouteTag,
rip2IfConfAuthType
INTEGER,
rip2IfConfAuthKey
OCTET STRING (SIZE(0..16)),
rip2IfConfSend
INTEGER,
rip2IfConfReceive
INTEGER,
rip2IfConfDefaultMetric
INTEGER,
rip2IfConfStatus
Validation
}

rip2IfConfAddress OBJECT-TYPE
SYNTAX IpAddress
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The IP Address of this system on the indicated
subnet."
::= { rip2IfConfEntry 1 }

rip2IfConfDomain OBJECT-TYPE
SYNTAX RouteTag

ACCESS read-write
STATUS mandatory
DESCRIPTION
"Value inserted into the Routing Domain field
of all RIP packets sent on this interface."
DEFVAL { '0000'h }
::= { rip2IfConfEntry 2 }

rip2IfConfAuthType OBJECT-TYPE
SYNTAX INTEGER {
noAuthentication (1),
simplePassword (2)
}
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The type of Authentication used on this inter-
face."
DEFVAL { noAuthentication }
::= { rip2IfConfEntry 3 }

rip2IfConfAuthKey OBJECT-TYPE
SYNTAX OCTET STRING (SIZE(0..16))
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The value to be used as the Authentication Key
whenever the corresponding instance of
rip2IfConfAuthType has the value simplePass-
word. A modification of the corresponding in-
stance of rip2IfConfAuthType does not modify
the rip2IfConfAuthKey value.

If a string shorter than 16 octets is supplied,
it will be left-justified and padded to 16 oc-
tets, on the right, with nulls (0x00).

Reading this object always results in an OCTET
STRING of length zero; authentication may not
be bypassed by reading the MIB object."
DEFVAL { ''h }
::= { rip2IfConfEntry 4 }

rip2IfConfSend OBJECT-TYPE
SYNTAX INTEGER {

doNotSend (1),
ripVersion1 (2),
rip1Compatible (3),
ripVersion2 (4)
}
ACCESS read-write
STATUS mandatory
DESCRIPTION
"What the router sends on this interface.
ripVersion1 implies sending RIP updates compli-
ant with RFC1058. rip1Compatible implies
broadcasting RIP-2 updates using RFC1058 route
subsumption rules. ripVersion2 implies multi-
casting RIP-2 updates."
DEFVAL { rip1Compatible }
::= { rip2IfConfEntry 5 }

rip2IfConfReceive OBJECT-TYPE
SYNTAX INTEGER {
rip1 (1),
rip2 (2),
rip1OrRip2 (3)
}
ACCESS read-write
STATUS mandatory
DESCRIPTION
"This indicates which version of RIP updates
are to be accepted. Note that rip2 and
rip1OrRip2 implies reception of multicast pack-
ets."
DEFVAL { rip1OrRip2 }
::= { rip2IfConfEntry 6 }

rip2IfConfDefaultMetric OBJECT-TYPE
SYNTAX INTEGER ( 0..15 )
ACCESS read-write
STATUS mandatory
DESCRIPTION
"This variable indicates what metric is to be
used as a default route in RIP updates ori-
ginated on this interface. A value of zero in-
dicates that no default route should be ori-
ginated; in this case, a default route via
another router may be propagated."
::= { rip2IfConfEntry 7 }

rip2IfConfStatus OBJECT-TYPE
SYNTAX Validation
ACCESS read-write
STATUS mandatory
DESCRIPTION
"Writing invalid has the effect of deleting
this interface."
DEFVAL { valid }
::= { rip2IfConfEntry 8 }

-- Peer Table

-- The RIP Peer Group
-- Implementation of this Group is Optional

-- This group provides information about active peer
-- relationships intended to assist in debugging.

rip2PeerTable OBJECT-TYPE
SYNTAX SEQUENCE OF Rip2PeerEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"A list of RIP Peers."
::= { rip2 4 }

rip2PeerEntry OBJECT-TYPE
SYNTAX Rip2PeerEntry
ACCESS not-accessible
STATUS mandatory
DESCRIPTION
"Information regarding a single routing peer."
INDEX { rip2PeerAddress, rip2PeerDomain }
::= { rip2PeerTable 1 }

Rip2PeerEntry ::=
SEQUENCE {
rip2PeerAddress
IpAddress,
rip2PeerDomain
RouteTag,
rip2PeerLastUpdate
TimeTicks,
rip2PeerVersion
INTEGER,
rip2PeerRcvBadPackets

Counter,
rip2PeerRcvBadRoutes
Counter
}

rip2PeerAddress OBJECT-TYPE
SYNTAX IpAddress
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The IP Address of the Peer System."
::= { rip2PeerEntry 1 }

rip2PeerDomain OBJECT-TYPE
SYNTAX RouteTag
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The value in the Routing Domain field in RIP
packets received from the peer."
::= { rip2PeerEntry 2 }

rip2PeerLastUpdate OBJECT-TYPE
SYNTAX TimeTicks
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The value of sysUpTime when the most recent
RIP update was received from this system."
::= { rip2PeerEntry 3 }

rip2PeerVersion OBJECT-TYPE
SYNTAX INTEGER ( 0..255 )
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The RIP version number in the header of the
last RIP packet received."
::= { rip2PeerEntry 4 }

rip2PeerRcvBadPackets OBJECT-TYPE
SYNTAX Counter
ACCESS read-only

STATUS mandatory
DESCRIPTION
"The number of RIP response packets from this
peer discarded as invalid."
::= { rip2PeerEntry 5 }

rip2PeerRcvBadRoutes OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
"The number of routes from this peer that were
ignored because the entry format was invalid."
::= { rip2PeerEntry 6 }

END

5. Acknowledgements

This document was produced by the RIP-2 Working Group of the Internet
Engineering Task Force (IETF).

In addition, the comments of the following individuals are also
acknowledged: Keith McCloghrie and Frank Kastenholz.

8. References

[1] Cerf, V., "IAB Recommendations for the Development of Internet
Network Management Standards", RFC1052, IAB, April 1988.

[2] Cerf, V., "Report of the Second Ad Hoc Network Management Review
Group", RFC1109, IAB, August 1989.

[3] Rose M., and K. McCloghrie, "Structure and Identification of
Management Information for TCP/IP-based internets", STD 16, RFC
1155, Performance Systems International, Hughes LAN Systems, May
1990.

[4] McCloghrie K., and M. Rose, "Management Information Base for
Network Management of TCP/IP-based internets", RFC1156, Hughes
LAN Systems, Performance Systems International, May 1990.

[5] Case, J., Fedor, M., Schoffstall, M., and J. Davin, "Simple
Network Management Protocol", STD 15, RFC1157, SNMP Research,
Performance Systems International, Performance Systems
International, MIT Laboratory for Computer Science, May 1990.

[6] Rose, M., Editor, "Management Information Base for Network
Management of TCP/IP-based internets: MIB-II", RFC1158,
Performance Systems International, May 1990.

[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.

[9] Rose, M., and K. McCloghrie, Editors, "Concise MIB Definitions",
STD 16, RFC1212, Performance Systems International, Hughes LAN
Systems, March 1991.

[10] Malkin, G., "RIP Version 2 - Carrying Additional Information",
RFC1388, Xylogics, Inc., January 1993.

[11] Malkin, G., "RIP Version 2 Protocol Analysis", RFC1387,
Xylogics, Inc., January 1993.

7. Security Considerations

Security issues are not discussed in this memo.

8. Authors' Addresses

Gary Malkin
Xylogics, Inc.
53 Third Avenue
Burlington, MA 01803

Phone: (617) 272-8140
EMail: gmalkin@Xylogics.COM

Fred Baker
Advanced Computer Communications
315 Bollay Drive
Santa Barbara, California 93117-6014

Phone: (805) 685-4455
EMail: fbaker@acc.com

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