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Versions: 00 01

Internet Draft                                                G. Malkin
draft-ietf-rip-mib-01.txt                               Nortel Networks
Obsoletes: 1724                                                F. Baker
Category: Standards Track                                 Cisco Systems
                                                             April 2001


                      RIP Version 2 MIB Extension

Status of this Memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.

   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
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet- Drafts as reference
   material or to cite them other than as "work in progress."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

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.

Acknowledgements

   The authors would like to thank the IETF ripv2 Working Group for
   their help in improving the RIP-2 MIB extension.

Table of Contents

   1. The Network Management Framework ......................    2
   2. Objects ...............................................    2
   2.1 Format of Definitions ................................    3
   3. Overview ..............................................    3
   3.1 Textual Conventions ..................................    3
   3.2 Structure of MIB .....................................    3
   3.3 Modifications from RFC 1389 ..........................    3
   4. Definitions ...........................................    5
   4.1 Global Counters ......................................    6
   4.2 RIP Interface Tables .................................    6
   4.3 Peer Table ...........................................   12

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   5. References ............................................   17
   6. Security Considerations ...............................   18
   7. Authors' Addresses ....................................   18














































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1. The Network Management Framework

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

      STD 16/RFC 1155 which defines the SMI, the mechanisms used for
         describing and naming objects for the purpose of management.

      STD 16/RFC 1212 defines a more concise description mechanism,
         which is wholly consistent with the SMI.

      RFC 1156 which defines MIB-I, the core set of managed objects for
         the Internet suite of protocols.  STD 17/RFC 1213 defines MIB-
         II, an evolution of MIB-I based on implementation experience
         and new operational requirements.

      STD 15/RFC 1157 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.

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2.1 Format of Definitions

   Section 4 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 type is RouteTag. The RouteTag type represents the
   contents of the Route Domain 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; two "interfaces"
   tables, which contains interface-specific statistics and
   configuration information; and an optional "peer" 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.

3.3 Modifications from RFC 1389

   The RIP-2 MIB was originally published in RFC 1389.  It encoded the
   concept of a Routing Domain, and did not address unnumbered
   interfaces.

   In the current version of the protocol, Route Domains are deprecated;
   therefore, they are deprecated in the MIB as well.  This means that
   the object rip2IfConfDomain is deprecated, and the object
   rip2PeerDomain (which cannot be deprecated, being an instance object)

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   must always be zero.

   Unnumbered interfaces are supported in this version.  Since the IP
   Address that the neighbor uses may be unknown to the system, a
   pseudo-address is used to identify these interfaces.  The pseudo-
   address is in the class A network 0.0.0.0, and the host number (the
   least significant 24 bits of the address) are the ifIndex value of
   the relevant IP Interface.  This is an additional new meaning of the
   objects rip2IfStatAddress and rip2IfConfAddress, backward compatible
   with the RFC 1389 usage.  The object rip2IfConfSrcAddress is added,
   to permit the configuration of the source address on an unnumbered
   interface, and the meaning of the object rip2PeerAddress is broadened
   to remain relevant on unnumbered interfaces.

   rip2IfConfSend is augmented with two values for the use of Demand RIP
   under RIP-I and RIP-II rules.  This avoids the necessity of a Demand
   RIP MIB.

   MD5 Authentication is supported.






























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4. Definitions

   RIPv2-MIB DEFINITIONS ::= BEGIN

   IMPORTS
       MODULE-IDENTITY, OBJECT-TYPE, Counter32,
       TimeTicks, IpAddress                     FROM SNMPv2-SMI
       TEXTUAL-CONVENTION, RowStatus            FROM SNMPv2-TC
       MODULE-COMPLIANCE, OBJECT-GROUP          FROM SNMPv2-CONF
       mib-2                                    FROM RFC1213-MIB;

   --  This MIB module uses the extended OBJECT-TYPE macro as
   --  defined in [9].

   rip2  MODULE-IDENTITY
        LAST-UPDATED "9407272253Z"    -- Wed Jul 27 22:53:04 PDT 1994
        ORGANIZATION "IETF RIP-II Working Group"
        CONTACT-INFO
          "    Fred Baker
          Postal:   Cisco Systems
                  519 Lado Drive
                  Santa Barbara, California 93111
          Tel: +1 805 681 0115
          E-Mail:   fbaker@cisco.com

          Postal:   Gary Malkin
               Nortel Networks
               600 Technology Park
               Billerica, MA 01821

          Phone:    +1 978 288 3634
          EMail:    gmalkin@nortelnetworks.com"
       DESCRIPTION
          "The MIB module to describe the RIP Version 2 Protocol"
       ::= { mib-2 23 }

   --  RIP-2 Management Information Base

   -- the RouteTag type represents the contents of the
   -- Route Domain field in the packet header or route entry.
   -- The use of the Route Domain is deprecated.

   RouteTag ::= TEXTUAL-CONVENTION
       STATUS     current
       DESCRIPTION
          "the RouteTag type represents the contents of the Route Domain
          field in the packet header or route entry"
       SYNTAX     OCTET STRING (SIZE (2))

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--4.1 Global Counters

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

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

   rip2Globals OBJECT IDENTIFIER ::= { rip2 1 }

       rip2GlobalRouteChanges OBJECT-TYPE
           SYNTAX   Counter32
           MAX-ACCESS   read-only
           STATUS   current
           DESCRIPTION
              "The number of route changes made to the IP Route
              Database by RIP.  This does not include the refresh
              of a route's age."
          ::= { rip2Globals 1 }

       rip2GlobalQueries OBJECT-TYPE
           SYNTAX   Counter32
           MAX-ACCESS   read-only
           STATUS   current
           DESCRIPTION
              "The number of responses sent to RIP queries
              from other systems."
          ::= { rip2Globals 2 }

--4.2 RIP Interface Tables

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

   -- The RIP Interface Status Table.

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


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

       Rip2IfStatEntry ::=
           SEQUENCE {
               rip2IfStatAddress
                   IpAddress,
               rip2IfStatRcvBadPackets
                   Counter32,
               rip2IfStatRcvBadRoutes
                   Counter32,
               rip2IfStatSentUpdates
                   Counter32,
               rip2IfStatStatus
                   RowStatus
       }

       rip2IfStatAddress OBJECT-TYPE
           SYNTAX   IpAddress
           MAX-ACCESS   read-only
           STATUS   current
           DESCRIPTION
              "The IP Address of this system on the indicated
              subnet. For unnumbered interfaces, the value 0.0.0.N,
              where the least significant 24 bits (N) is the ifIndex
              for the IP Interface in network byte order."
          ::= { rip2IfStatEntry 1 }

       rip2IfStatRcvBadPackets OBJECT-TYPE
           SYNTAX   Counter32
           MAX-ACCESS   read-only
           STATUS   current
           DESCRIPTION
              "The number of RIP response packets received by
              the RIP process which were subsequently discarded
              for any reason (e.g. a version 0 packet, or an
              unknown command type)."
          ::= { rip2IfStatEntry 2 }

       rip2IfStatRcvBadRoutes OBJECT-TYPE
           SYNTAX   Counter32
           MAX-ACCESS   read-only

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           STATUS   current
           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   Counter32
           MAX-ACCESS   read-only
           STATUS   current
           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   RowStatus
           MAX-ACCESS   read-create
           STATUS   current
           DESCRIPTION
              "Writing invalid has the effect of deleting
              this interface."
          ::= { rip2IfStatEntry 5 }

   -- The RIP Interface Configuration Table.

       rip2IfConfTable OBJECT-TYPE
           SYNTAX   SEQUENCE OF Rip2IfConfEntry
           MAX-ACCESS   not-accessible
           STATUS   current
           DESCRIPTION
              "A list of subnets which require separate
              configuration in RIP."
          ::= { rip2 3 }

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

       Rip2IfConfEntry ::=

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           SEQUENCE {
               rip2IfConfAddress
                   IpAddress,
               rip2IfConfDomain
                   RouteTag,
               rip2IfConfAuthType
                   INTEGER,
               rip2IfConfAuthKey
                   OCTET STRING (SIZE(0..16)),
               rip2IfConfSend
                   INTEGER,
               rip2IfConfReceive
                   INTEGER,
               rip2IfConfDefaultMetric
                   INTEGER,
               rip2IfConfStatus
                   RowStatus,
               rip2IfConfSrcAddress
                   IpAddress
       }

       rip2IfConfAddress OBJECT-TYPE
           SYNTAX   IpAddress
           MAX-ACCESS   read-only
           STATUS   current
           DESCRIPTION
              "The IP Address of this system on the indicated
              subnet.  For unnumbered interfaces, the value 0.0.0.N,
              where the least significant 24 bits (N) is the ifIndex
              for the IP Interface in network byte order."
          ::= { rip2IfConfEntry 1 }

       rip2IfConfDomain OBJECT-TYPE
           SYNTAX   RouteTag
           MAX-ACCESS   read-create
           STATUS   obsolete
           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),
                 md5 (3)
                    }

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           MAX-ACCESS   read-create
           STATUS   current
           DESCRIPTION
              "The type of Authentication used on this
              interface."
          DEFVAL { noAuthentication }
          ::= { rip2IfConfEntry 3 }

       rip2IfConfAuthKey OBJECT-TYPE
           SYNTAX   OCTET STRING (SIZE(0..16))
           MAX-ACCESS   read-create
           STATUS   current
           DESCRIPTION
              "The value to be used as the Authentication Key
              whenever the corresponding instance of
              rip2IfConfAuthType has a value other than
           noAuthentication.  A modification of the corresponding
              instance 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 octets, 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),
                 ripV1Demand (5),
                 ripV2Demand (6)
                    }
           MAX-ACCESS   read-create
           STATUS   current
           DESCRIPTION
              "What the router sends on this interface.
              ripVersion1 implies sending RIP updates compliant
              with  RFC  1058.   rip1Compatible implies
              broadcasting RIP-2 updates using RFC 1058 route
              subsumption rules.  ripVersion2 implies
              multicasting RIP-2 updates.  ripV1Demand indicates
           the use of Demand RIP on a WAN interface under RIP

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           Version 1 rules.  ripV2Demand indicates the use of
           Demand RIP on a WAN interface under Version 2 rules."
          DEFVAL { ripVersion2 }
          ::= { rip2IfConfEntry 5 }

       rip2IfConfReceive OBJECT-TYPE
           SYNTAX   INTEGER {
                       rip1 (1),
                       rip2 (2),
                       rip1OrRip2 (3),
                       doNotReceive (4)
                    }
           MAX-ACCESS   read-create
           STATUS   current
           DESCRIPTION
              "This indicates which version of RIP updates
              are to be accepted.  Note that rip2 and
              rip1OrRip2 implies reception of multicast,
              in addition to broadcast, packets."
          DEFVAL { rip1OrRip2 }
          ::= { rip2IfConfEntry 6 }

       rip2IfConfDefaultMetric OBJECT-TYPE
           SYNTAX   INTEGER ( 0..15 )
           MAX-ACCESS   read-create
           STATUS   current
           DESCRIPTION
              "This variable indicates the metric that is to
              be used for the default route entry in RIP updates
              originated on this interface.  A value of zero
              indicates that no default route should be
              originated; in this case, a default route via
              another router may be propagated."
          ::= { rip2IfConfEntry 7 }

       rip2IfConfStatus OBJECT-TYPE
           SYNTAX   RowStatus
           MAX-ACCESS   read-create
           STATUS   current
           DESCRIPTION
              "Writing invalid has  the  effect  of  deleting
              this interface."
          ::= { rip2IfConfEntry 8 }

       rip2IfConfSrcAddress OBJECT-TYPE
           SYNTAX   IpAddress
           MAX-ACCESS   read-create
           STATUS   current

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           DESCRIPTION
              "The IP Address this system will use as a source
               address on this interface.  If it is a numbered
               interface, this MUST be the same value as
               rip2IfConfAddress.  On unnumbered interfaces,
               it must be the value of rip2IfConfAddress for
               some interface on the system."
          ::= { rip2IfConfEntry 9 }

--4.3 Peer Table

   --  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.  An
   --      active peer is a router from which a valid RIP
   --      updated has been heard in the last 180 seconds.

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

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

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

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               rip2PeerRcvBadPackets
                   Counter32,
               rip2PeerRcvBadRoutes
                   Counter32
               }

       rip2PeerAddress OBJECT-TYPE
           SYNTAX   IpAddress
           MAX-ACCESS   read-only
           STATUS   current
           DESCRIPTION
              "The IP Address that the peer is using as its source
               address.  Note that on an unnumbered link, this may
               not be a member of any subnet on the system."
          ::= { rip2PeerEntry 1 }

       rip2PeerDomain OBJECT-TYPE
           SYNTAX   RouteTag
           MAX-ACCESS   read-only
           STATUS   current
           DESCRIPTION
              "The value in the Routing Domain field  in  RIP
              packets received from the peer.  As domain suuport
              is deprecated, this must be zero."
          ::= { rip2PeerEntry 2 }

       rip2PeerLastUpdate OBJECT-TYPE
           SYNTAX   TimeTicks
           MAX-ACCESS   read-only
           STATUS   current
           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 )
           MAX-ACCESS   read-only
           STATUS   current
           DESCRIPTION
              "The RIP version number in the header of the
              last RIP packet received."
          ::= { rip2PeerEntry 4 }

       rip2PeerRcvBadPackets OBJECT-TYPE
           SYNTAX   Counter32
           MAX-ACCESS   read-only
           STATUS   current

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


       rip2PeerRcvBadRoutes OBJECT-TYPE
           SYNTAX   Counter32
           MAX-ACCESS   read-only
           STATUS   current
           DESCRIPTION
              "The number of routes from this peer that were
              ignored because the entry format was invalid."
          ::= { rip2PeerEntry 6 }



































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   -- conformance information

   rip2Conformance OBJECT IDENTIFIER ::= { rip2 5 }

   rip2Groups      OBJECT IDENTIFIER ::= { rip2Conformance 1 }
   rip2Compliances OBJECT IDENTIFIER ::= { rip2Conformance 2 }

   -- compliance statements
   rip2Compliance MODULE-COMPLIANCE
       STATUS  current
       DESCRIPTION
          "The compliance statement "
       MODULE  -- this module
       MANDATORY-GROUPS {
                    rip2GlobalGroup,
                    rip2IfStatGroup,
                    rip2IfConfGroup,
                    rip2PeerGroup
        }
       GROUP       rip2GlobalGroup
       DESCRIPTION
          "This group defines global controls for RIP-II systems."
       GROUP       rip2IfStatGroup
       DESCRIPTION
          "This group defines interface statistics for RIP-II systems."
       GROUP       rip2IfConfGroup
       DESCRIPTION
          "This group defines interface configuration for RIP-II
          systems."
       GROUP       rip2PeerGroup
       DESCRIPTION
          "This group defines peer information for RIP-II systems."
       ::= { rip2Compliances 1 }
















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   -- units of conformance

   rip2GlobalGroup    OBJECT-GROUP
       OBJECTS {
             rip2GlobalRouteChanges,
             rip2GlobalQueries
       }
       STATUS  current
       DESCRIPTION
          "This group defines global controls for RIP-II systems."
       ::= { rip2Groups 1 }
   rip2IfStatGroup    OBJECT-GROUP
       OBJECTS {
               rip2IfStatAddress,
               rip2IfStatRcvBadPackets,
               rip2IfStatRcvBadRoutes,
               rip2IfStatSentUpdates,
               rip2IfStatStatus
       }
       STATUS  current
       DESCRIPTION
          "This group defines interface statistics for RIP-II systems."
       ::= { rip2Groups 2 }
   rip2IfConfGroup    OBJECT-GROUP
       OBJECTS {
               rip2IfConfAddress,
               rip2IfConfAuthType,
               rip2IfConfAuthKey,
               rip2IfConfSend,
               rip2IfConfReceive,
               rip2IfConfDefaultMetric,
               rip2IfConfStatus,
               rip2IfConfSrcAddress
       }
       STATUS  current
       DESCRIPTION
          "This group defines interface configuration for RIP-II
          systems."
       ::= { rip2Groups 3 }
   rip2PeerGroup    OBJECT-GROUP
       OBJECTS {
               rip2PeerAddress,
               rip2PeerDomain,
               rip2PeerLastUpdate,
               rip2PeerVersion,
               rip2PeerRcvBadPackets,
               rip2PeerRcvBadRoutes
       }

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       STATUS  current
       DESCRIPTION
          "This group defines peer information for RIP-II systems."
       ::= { rip2Groups 4 }
   END

5. References

   [1] Cerf, V., "IAB Recommendations for the Development of Internet
       Network Management Standards", RFC 1052, IAB, April 1988.

   [2] Cerf, V., "Report of the Second Ad Hoc Network Management Review
       Group", RFC 1109, 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", RFC 1156, Hughes
       LAN Systems, Performance Systems International, May 1990.

   [5] Case, J., Fedor, M., Schoffstall, M., and J. Davin, "Simple
       Network Management Protocol", STD 15, RFC 1157, 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", RFC 1158,
       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, RFC 1212, Performance Systems International, Hughes LAN
       Systems, March 1991.

  [10] Malkin, G., "RIP Version 2 - Carrying Additional Information",
       RFC 2453, Bay Networks, November 1998.

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  [11] Malkin, G., "RIP Version 2 Protocol Analysis", RFC 1721,
       Xylogics, Inc., November 1994.

  [12] Malkin, G., "RIP Version 2 Protocol Applicability Statement", RFC
       1722, Xylogics, Inc., November 1994.

6.  Security Considerations

   Security issues are not discussed in this memo.  See the most recent
   SNMP RFCs for security considerations.

7.  Authors' Addresses

   Gary Malkin
   Nortel Networks
   600 Technology Park
   Billerica, MA 01821

   Phone: 978-288-3634
   EMail: gmalkin@nortelnetworks.com


   Fred Baker
   Cisco Systems
   519 Lado Drive
   Santa Barbara, California 93111

   Phone: 805-681-0115
   EMail: fred@cisco.com



















Malkin & Baker              Expires: 23Oct01                          19


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