<pre>Network Working Group                                        B. Haberman
Request for Comments: 4292                      Johns Hopkins University
Obsoletes: <a href="./rfc2096">2096</a>                                               April 2006
Category: Standards Track


                        <span class="h1">IP Forwarding Table MIB</span>

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.

Copyright Notice

   Copyright (C) The Internet Society (2006).

Abstract

   This document 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 related to
   the forwarding of Internet Protocol (IP) packets in an IP version-
   independent manner.  This document obsoletes <a href="./rfc2096">RFC 2096</a>.

Table of Contents

   <a href="#section-1">1</a>. Introduction ....................................................<a href="#page-2">2</a>
   <a href="#section-2">2</a>. Conventions Used In This Document ...............................<a href="#page-2">2</a>
   <a href="#section-3">3</a>. The Internet-Standard Management Framework ......................<a href="#page-2">2</a>
   <a href="#section-4">4</a>. Overview ........................................................<a href="#page-2">2</a>
      <a href="#section-4.1">4.1</a>. Relationship to Other MIBs .................................<a href="#page-3">3</a>
           <a href="#section-4.1.1">4.1.1</a>. <a href="./rfc1213">RFC 1213</a> ............................................<a href="#page-3">3</a>
           <a href="#section-4.1.2">4.1.2</a>. <a href="./rfc1354">RFC 1354</a> ............................................<a href="#page-3">3</a>
           <a href="#section-4.1.3">4.1.3</a>. <a href="./rfc2096">RFC 2096</a> ............................................<a href="#page-3">3</a>
           <a href="#section-4.1.4">4.1.4</a>. <a href="./rfc2011">RFC 2011</a> and 2465 ...................................<a href="#page-3">3</a>
   <a href="#section-5">5</a>. Definitions .....................................................<a href="#page-3">3</a>
   <a href="#section-6">6</a>. Security Considerations ........................................<a href="#page-30">30</a>
   <a href="#section-7">7</a>. Changes from <a href="./rfc2096">RFC 2096</a> ..........................................<a href="#page-31">31</a>
   <a href="#section-8">8</a>. Normative References ...........................................<a href="#page-32">32</a>
   <a href="#section-9">9</a>. Informative References .........................................<a href="#page-32">32</a>
   <a href="#section-10">10</a>. Authors and Acknowledgements ..................................<a href="#page-33">33</a>






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<span class="h2"><a class="selflink" id="section-1" href="#section-1">1</a>.  Introduction</span>

   This document defines a portion of the Management Information Base
   (MIB) for use in managing objects related to the forwarding of
   Internet Protocol (IP) packets in an IP version-independent manner.

   It should be noted that the MIB definition described herein does not
   support multiple instances based on the same address family type.
   However, it does support an instance of the MIB per address family.

<span class="h2"><a class="selflink" id="section-2" href="#section-2">2</a>.  Conventions Used In This Document</span>

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in <a href="./rfc2119">RFC 2119</a> [<a href="./rfc2119" title="&quot;Key words for use in RFCs to Indicate Requirement Levels&quot;">RFC2119</a>].

<span class="h2"><a class="selflink" id="section-3" href="#section-3">3</a>.  The Internet-Standard Management Framework</span>

   For a detailed overview of the documents that describe the current
   Internet-Standard Management Framework, please refer to <a href="./rfc3410#section-7">section&nbsp;7 of
   RFC 3410</a> [<a href="./rfc3410" title="&quot;Introduction and Applicability Statements for Internet- Standard Management Framework&quot;">RFC3410</a>].

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  MIB objects are generally
   accessed through the Simple Network Management Protocol (SNMP).
   Objects in the MIB are defined using the mechanisms defined in the
   Structure of Management Information (SMI).  This memo specifies a MIB
   module that is compliant to the SMIv2, which is described in STD 58,
   <a href="./rfc2578">RFC 2578</a> [<a href="./rfc2578" title="&quot;Structure of Management Information Version 2 (SMIv2)&quot;">RFC2578</a>], STD 58, <a href="./rfc2579">RFC 2579</a> [<a href="./rfc2579" title="&quot;Textual Conventions for SMIv2&quot;">RFC2579</a>] and STD 58, <a href="./rfc2580">RFC 2580</a>
   [<a href="./rfc2580" title="&quot;Conformance Statements for SMIv2&quot;">RFC2580</a>].

<span class="h2"><a class="selflink" id="section-4" href="#section-4">4</a>.  Overview</span>

   The MIB consists of one current table and two current global objects.

      1. The object inetCidrRouteNumber indicates the number of current
         routes.  This is primarily to avoid having to read the table in
         order to determine this number.

      2. The object inetCidrRouteDiscards counts the number of valid
         routes that were discarded from inetCidrRouteTable for any
         reason.  This object replaces the ipRoutingDiscards and
         ipv6DiscardedRoutes objects.

      3. The inetCidrRouteTable provides the ability to display IP
         version-independent multipath CIDR routes.





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<span class="h3"><a class="selflink" id="section-4.1" href="#section-4.1">4.1</a>.  Relationship to Other MIBs</span>

   This MIB definition contains several deprecated and obsolete tables
   and objects.  The following subsections describe the relationship
   between these objects and other MIB modules.

<span class="h4"><a class="selflink" id="section-4.1.1" href="#section-4.1.1">4.1.1</a>.  <a href="./rfc1213">RFC 1213</a></span>

   The ipRouteTable object was originally defined in <a href="./rfc1213">RFC 1213</a> [<a href="./rfc1213" title="&quot;Management Information Base for Network Management of TCP/IP-based internets: MIB-II&quot;">RFC1213</a>].
   It was updated by ipForwardTable in <a href="./rfc1354">RFC 1354</a> [<a href="./rfc1354" title="&quot;IP Forwarding Table MIB&quot;">RFC1354</a>].

<span class="h4"><a class="selflink" id="section-4.1.2" href="#section-4.1.2">4.1.2</a>.  <a href="./rfc1354">RFC 1354</a></span>

   The ipForwardTable object replaced the ipRouteTable object from <a href="./rfc1213">RFC</a>
   <a href="./rfc1213">1213</a>.  It was in turn obsoleted by the ipCidrRouteTable defined in
   <a href="./rfc2096">RFC 2096</a> [<a href="./rfc2096" title="&quot;IP Forwarding Table MIB&quot;">RFC2096</a>].

   In addition, <a href="./rfc1354">RFC 1354</a> introduced ipForwardNumber.  This object
   reflects the number of entries found in ipForwardTable.  It was
   obsoleted by ipCidrRouteNumber, defined in <a href="./rfc2096">RFC 2096</a>.

<span class="h4"><a class="selflink" id="section-4.1.3" href="#section-4.1.3">4.1.3</a>.  <a href="./rfc2096">RFC 2096</a></span>

   In <a href="./rfc2096">RFC 2096</a>, the ipCidrRouteTable and ipCidrRouteNumber were
   introduced.  The ipCidrRouteTable object supports multipath IP routes
   having the same network number but differing network masks.  The
   number of entries in that table is reflected in ipCidrRouteNumber.
   These objects are deprecated by the definitions contained in this MIB
   definition.

<span class="h4"><a class="selflink" id="section-4.1.4" href="#section-4.1.4">4.1.4</a>.  <a href="./rfc2011">RFC 2011</a> and 2465</span>

   <a href="./rfc2011">RFC 2011</a> [<a href="./rfc2011" title="&quot;SNMPv2 Management Information Base for the Internet Protocol using SMIv2&quot;">RFC2011</a>] contains the ipRoutingDiscards object, which
   counts the number of valid routes that have been removed from the
   ipCidrRouteTable object.  The corresponding ipv6DiscardedRoutes
   object is defined in <a href="./rfc2465">RFC 2465</a> [<a href="./rfc2465" title="D. and S. Onishi">RFC2465</a>].  These objects are
   deprecated in favor of the version-independent object
   inetCidrRouteDiscards defined in this MIB.

<span class="h2"><a class="selflink" id="section-5" href="#section-5">5</a>.  Definitions</span>

   IP-FORWARD-MIB DEFINITIONS ::= BEGIN

   IMPORTS
       MODULE-IDENTITY, OBJECT-TYPE,
       IpAddress, Integer32, Gauge32,
       Counter32                          FROM SNMPv2-SMI
       RowStatus                          FROM SNMPv2-TC



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       MODULE-COMPLIANCE, OBJECT-GROUP    FROM SNMPv2-CONF
       InterfaceIndexOrZero               FROM IF-MIB
       ip                                 FROM IP-MIB
       IANAipRouteProtocol                FROM IANA-RTPROTO-MIB
       InetAddress, InetAddressType,
       InetAddressPrefixLength,
       InetAutonomousSystemNumber         FROM INET-ADDRESS-MIB;

   ipForward MODULE-IDENTITY
       LAST-UPDATED "200602010000Z"
       ORGANIZATION
              "IETF IPv6 Working Group
               <a href="http://www.ietf.org/html.charters/ipv6-charter.html">http://www.ietf.org/html.charters/ipv6-charter.html</a>"
       CONTACT-INFO
              "Editor:
               Brian Haberman
               Johns Hopkins University - Applied Physics Laboratory
               Mailstop 17-S442
               11100 Johns Hopkins Road
               Laurel MD,  20723-6099  USA

               Phone: +1-443-778-1319
               Email: brian@innovationslab.net

               Send comments to &lt;ipv6@ietf.org&gt;"
       DESCRIPTION
              "The MIB module for the management of CIDR multipath IP
               Routes.

               Copyright (C) The Internet Society (2006).  This version
               of this MIB module is a part of <a href="./rfc4292">RFC 4292</a>; see the RFC
               itself for full legal notices."

       REVISION      "200602010000Z"
       DESCRIPTION
              "IPv4/v6 version-independent revision.  Minimal changes
               were made to the original <a href="./rfc2096">RFC 2096</a> MIB to allow easy
               upgrade of existing IPv4 implementations to the
               version-independent MIB.  These changes include:

               Adding inetCidrRouteDiscards as a replacement for the
               deprecated ipRoutingDiscards and ipv6DiscardedRoutes
               objects.

               Adding a new conformance statement to support the
               implementation of the IP Forwarding MIB in a
               read-only mode.




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               The inetCidrRouteTable replaces the IPv4-specific
               ipCidrRouteTable, its related objects, and related
               conformance statements.

               Published as <a href="./rfc4292">RFC 4292</a>."

       REVISION      "199609190000Z"
       DESCRIPTION
              "Revised to support CIDR routes.
               Published as <a href="./rfc2096">RFC 2096</a>."

       REVISION      "199207022156Z"
       DESCRIPTION
              "Initial version, published as <a href="./rfc1354">RFC 1354</a>."
       ::= { ip 24 }

   inetCidrRouteNumber OBJECT-TYPE
       SYNTAX     Gauge32
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
              "The number of current inetCidrRouteTable entries that
               are not invalid."
   ::= { ipForward 6 }

   inetCidrRouteDiscards OBJECT-TYPE
       SYNTAX     Counter32
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
              "The number of valid route entries discarded from the
               inetCidrRouteTable.  Discarded route entries do not
               appear in the inetCidrRouteTable.  One possible reason
               for discarding an entry would be to free-up buffer space
               for other route table entries."
       ::= { ipForward 8 }

   --  Inet CIDR Route Table

   --  The Inet CIDR Route Table deprecates and replaces the
   --  ipCidrRoute Table currently in the IP Forwarding Table MIB.
   --  It adds IP protocol independence.

   inetCidrRouteTable OBJECT-TYPE
       SYNTAX     SEQUENCE OF InetCidrRouteEntry
       MAX-ACCESS not-accessible
       STATUS     current
       DESCRIPTION



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              "This entity's IP Routing table."
       REFERENCE
              "<a href="./rfc1213#section-6.6">RFC 1213 Section&nbsp;6.6</a>, The IP Group"
       ::= { ipForward 7 }

   inetCidrRouteEntry OBJECT-TYPE
       SYNTAX     InetCidrRouteEntry
       MAX-ACCESS not-accessible
       STATUS     current
       DESCRIPTION
              "A particular route to a particular destination, under a
               particular policy (as reflected in the
               inetCidrRoutePolicy object).

               Dynamically created rows will survive an agent reboot.

               Implementers need to be aware that if the total number
               of elements (octets or sub-identifiers) in
               inetCidrRouteDest, inetCidrRoutePolicy, and
               inetCidrRouteNextHop exceeds 111, then OIDs of column
               instances in this table will have more than 128 sub-
               identifiers and cannot be accessed using SNMPv1,
               SNMPv2c, or SNMPv3."
       INDEX {
           inetCidrRouteDestType,
           inetCidrRouteDest,
           inetCidrRoutePfxLen,
           inetCidrRoutePolicy,
           inetCidrRouteNextHopType,
           inetCidrRouteNextHop
           }
       ::= { inetCidrRouteTable 1 }

   InetCidrRouteEntry ::= SEQUENCE {
           inetCidrRouteDestType     InetAddressType,
           inetCidrRouteDest         InetAddress,
           inetCidrRoutePfxLen       InetAddressPrefixLength,
           inetCidrRoutePolicy       OBJECT IDENTIFIER,
           inetCidrRouteNextHopType  InetAddressType,
           inetCidrRouteNextHop      InetAddress,
           inetCidrRouteIfIndex      InterfaceIndexOrZero,
           inetCidrRouteType         INTEGER,
           inetCidrRouteProto        IANAipRouteProtocol,
           inetCidrRouteAge          Gauge32,
           inetCidrRouteNextHopAS    InetAutonomousSystemNumber,
           inetCidrRouteMetric1      Integer32,
           inetCidrRouteMetric2      Integer32,
           inetCidrRouteMetric3      Integer32,



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           inetCidrRouteMetric4      Integer32,
           inetCidrRouteMetric5      Integer32,
           inetCidrRouteStatus       RowStatus
       }

   inetCidrRouteDestType OBJECT-TYPE
       SYNTAX     InetAddressType
       MAX-ACCESS not-accessible
       STATUS     current
       DESCRIPTION
              "The type of the inetCidrRouteDest address, as defined
               in the InetAddress MIB.

               Only those address types that may appear in an actual
               routing table are allowed as values of this object."
       REFERENCE "<a href="./rfc4001">RFC 4001</a>"
       ::= { inetCidrRouteEntry 1 }

   inetCidrRouteDest OBJECT-TYPE
       SYNTAX     InetAddress
       MAX-ACCESS not-accessible
       STATUS     current
       DESCRIPTION
              "The destination IP address of this route.

               The type of this address is determined by the value of
               the inetCidrRouteDestType object.

               The values for the index objects inetCidrRouteDest and
               inetCidrRoutePfxLen must be consistent.  When the value
               of inetCidrRouteDest (excluding the zone index, if one
               is present) is x, then the bitwise logical-AND
               of x with the value of the mask formed from the
               corresponding index object inetCidrRoutePfxLen MUST be
               equal to x.  If not, then the index pair is not
               consistent and an inconsistentName error must be
               returned on SET or CREATE requests."

       ::= { inetCidrRouteEntry 2 }

   inetCidrRoutePfxLen OBJECT-TYPE
       SYNTAX     InetAddressPrefixLength
       MAX-ACCESS not-accessible
       STATUS     current
       DESCRIPTION
              "Indicates the number of leading one bits that form the
               mask to be logical-ANDed with the destination address
               before being compared to the value in the



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               inetCidrRouteDest field.

               The values for the index objects inetCidrRouteDest and
               inetCidrRoutePfxLen must be consistent.  When the value
               of inetCidrRouteDest (excluding the zone index, if one
               is present) is x, then the bitwise logical-AND
               of x with the value of the mask formed from the
               corresponding index object inetCidrRoutePfxLen MUST be
               equal to x.  If not, then the index pair is not
               consistent and an inconsistentName error must be
               returned on SET or CREATE requests."

       ::= { inetCidrRouteEntry 3 }

   inetCidrRoutePolicy OBJECT-TYPE
       SYNTAX     OBJECT IDENTIFIER
       MAX-ACCESS not-accessible
       STATUS     current
       DESCRIPTION
              "This object is an opaque object without any defined
               semantics.  Its purpose is to serve as an additional
               index that may delineate between multiple entries to
               the same destination.  The value { 0 0 } shall be used
               as the default value for this object."
       ::= { inetCidrRouteEntry 4 }

   inetCidrRouteNextHopType OBJECT-TYPE
       SYNTAX     InetAddressType
       MAX-ACCESS not-accessible
       STATUS     current
       DESCRIPTION
              "The type of the inetCidrRouteNextHop address, as
               defined in the InetAddress MIB.

               Value should be set to unknown(0) for non-remote
               routes.

               Only those address types that may appear in an actual
               routing table are allowed as values of this object."
       REFERENCE "<a href="./rfc4001">RFC 4001</a>"
       ::= { inetCidrRouteEntry 5 }

   inetCidrRouteNextHop OBJECT-TYPE
       SYNTAX     InetAddress
       MAX-ACCESS not-accessible
       STATUS     current
       DESCRIPTION
              "On remote routes, the address of the next system en



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               route.  For non-remote routes, a zero length string.

               The type of this address is determined by the value of
               the inetCidrRouteNextHopType object."
       ::= { inetCidrRouteEntry 6 }

   inetCidrRouteIfIndex OBJECT-TYPE
       SYNTAX     InterfaceIndexOrZero
       MAX-ACCESS read-create
       STATUS     current
       DESCRIPTION
              "The ifIndex value that identifies the local interface
               through which the next hop of this route should be
               reached.  A value of 0 is valid and represents the
               scenario where no interface is specified."
       ::= { inetCidrRouteEntry 7 }

   inetCidrRouteType OBJECT-TYPE
       SYNTAX     INTEGER {
                   other    (1), -- not specified by this MIB
                   reject   (2), -- route that discards traffic and
                                 --   returns ICMP notification
                   local    (3), -- local interface
                   remote   (4), -- remote destination
                   blackhole(5)  -- route that discards traffic
                                 --   silently
                }
       MAX-ACCESS read-create
       STATUS     current
       DESCRIPTION
              "The type of route.  Note that local(3) refers to a
               route for which the next hop is the final destination;
               remote(4) refers to a route for which the next hop is
               not the final destination.

               Routes that do not result in traffic forwarding or
               rejection should not be displayed, even if the
               implementation keeps them stored internally.

               reject(2) refers to a route that, if matched, discards
               the message as unreachable and returns a notification
               (e.g., ICMP error) to the message sender.  This is used
               in some protocols as a means of correctly aggregating
               routes.

               blackhole(5) refers to a route that, if matched,
               discards the message silently."
       ::= { inetCidrRouteEntry 8 }



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   inetCidrRouteProto OBJECT-TYPE
       SYNTAX     IANAipRouteProtocol
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
              "The routing mechanism via which this route was learned.
               Inclusion of values for gateway routing protocols is
               not intended to imply that hosts should support those
               protocols."
       ::= { inetCidrRouteEntry 9 }

   inetCidrRouteAge OBJECT-TYPE
       SYNTAX     Gauge32
       MAX-ACCESS read-only
       STATUS     current
       DESCRIPTION
              "The number of seconds since this route was last updated
               or otherwise determined to be correct.  Note that no
               semantics of 'too old' can be implied, except through
               knowledge of the routing protocol by which the route
               was learned."
       ::= { inetCidrRouteEntry 10 }

   inetCidrRouteNextHopAS OBJECT-TYPE
       SYNTAX     InetAutonomousSystemNumber
       MAX-ACCESS read-create
       STATUS     current
       DESCRIPTION
              "The Autonomous System Number of the Next Hop.  The
               semantics of this object are determined by the routing-
               protocol specified in the route's inetCidrRouteProto
               value.  When this object is unknown or not relevant, its
               value should be set to zero."
       DEFVAL { 0 }
       ::= { inetCidrRouteEntry 11 }

   inetCidrRouteMetric1 OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     current
       DESCRIPTION
              "The primary routing metric for this route.  The
               semantics of this metric are determined by the routing-
               protocol specified in the route's inetCidrRouteProto
               value.  If this metric is not used, its value should be
               set to -1."
       DEFVAL { -1 }



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       ::= { inetCidrRouteEntry 12 }

   inetCidrRouteMetric2 OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     current
       DESCRIPTION
              "An alternate routing metric for this route.  The
               semantics of this metric are determined by the routing-
               protocol specified in the route's inetCidrRouteProto
               value.  If this metric is not used, its value should be
               set to -1."
       DEFVAL { -1 }
       ::= { inetCidrRouteEntry 13 }

   inetCidrRouteMetric3 OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     current
       DESCRIPTION
              "An alternate routing metric for this route.  The
               semantics of this metric are determined by the routing-
               protocol specified in the route's inetCidrRouteProto
               value.  If this metric is not used, its value should be
               set to -1."
       DEFVAL { -1 }
       ::= { inetCidrRouteEntry 14 }

   inetCidrRouteMetric4 OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     current
       DESCRIPTION
              "An alternate routing metric for this route.  The
               semantics of this metric are determined by the routing-
               protocol specified in the route's inetCidrRouteProto
               value.  If this metric is not used, its value should be
               set to -1."
       DEFVAL { -1 }
       ::= { inetCidrRouteEntry 15 }

   inetCidrRouteMetric5 OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     current
       DESCRIPTION
              "An alternate routing metric for this route.  The
               semantics of this metric are determined by the routing-



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               protocol specified in the route's inetCidrRouteProto
               value.  If this metric is not used, its value should be
               set to -1."
       DEFVAL { -1 }
       ::= { inetCidrRouteEntry 16 }

   inetCidrRouteStatus OBJECT-TYPE
       SYNTAX     RowStatus
       MAX-ACCESS read-create
       STATUS     current
       DESCRIPTION
              "The row status variable, used according to row
               installation and removal conventions.

               A row entry cannot be modified when the status is
               marked as active(1)."
       ::= { inetCidrRouteEntry 17 }

   --  Conformance information

   ipForwardConformance
        OBJECT IDENTIFIER ::= { ipForward 5 }

   ipForwardGroups
        OBJECT IDENTIFIER ::= { ipForwardConformance 1 }

   ipForwardCompliances
        OBJECT IDENTIFIER ::= { ipForwardConformance 2 }

   --  Compliance statements

   ipForwardFullCompliance MODULE-COMPLIANCE
       STATUS     current
       DESCRIPTION
              "When this MIB is implemented for read-create, the
               implementation can claim full compliance.

               There are a number of INDEX objects that cannot be
               represented in the form of OBJECT clauses in SMIv2,
               but for which there are compliance requirements,
               expressed in OBJECT clause form in this description:

               -- OBJECT      inetCidrRouteDestType
               -- SYNTAX      InetAddressType (ipv4(1), ipv6(2),
               --                              ipv4z(3), ipv6z(4))
               -- DESCRIPTION
               --     This MIB requires support for global and
               --     non-global ipv4 and ipv6 addresses.



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               --
               -- OBJECT      inetCidrRouteDest
               -- SYNTAX      InetAddress (SIZE (4 | 8 | 16 | 20))
               -- DESCRIPTION
               --     This MIB requires support for global and
               --     non-global IPv4 and IPv6 addresses.
               --
               -- OBJECT      inetCidrRouteNextHopType
               -- SYNTAX      InetAddressType (unknown(0), ipv4(1),
               --                              ipv6(2), ipv4z(3)
               --                              ipv6z(4))
               -- DESCRIPTION
               --     This MIB requires support for global and
               --     non-global ipv4 and ipv6 addresses.
               --
               -- OBJECT      inetCidrRouteNextHop
               -- SYNTAX      InetAddress (SIZE (0 | 4 | 8 | 16 | 20))
               -- DESCRIPTION
               --     This MIB requires support for global and
               --     non-global IPv4 and IPv6 addresses.
               "

      MODULE -- this module
      MANDATORY-GROUPS { inetForwardCidrRouteGroup }

      OBJECT        inetCidrRouteStatus
      SYNTAX        RowStatus { active(1), notInService (2) }
      WRITE-SYNTAX  RowStatus { active(1), notInService (2),
                                createAndGo(4), destroy(6) }
      DESCRIPTION  "Support for createAndWait is not required."

      ::= { ipForwardCompliances 3 }

   ipForwardReadOnlyCompliance MODULE-COMPLIANCE
      STATUS     current
      DESCRIPTION
              "When this MIB is implemented without support for read-
               create (i.e., in read-only mode), the implementation can
               claim read-only compliance."
      MODULE -- this module
      MANDATORY-GROUPS { inetForwardCidrRouteGroup }

      OBJECT      inetCidrRouteIfIndex
      MIN-ACCESS  read-only
      DESCRIPTION
         "Write access is not required."

      OBJECT      inetCidrRouteType



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      MIN-ACCESS  read-only
      DESCRIPTION
         "Write access is not required."

      OBJECT      inetCidrRouteNextHopAS
      MIN-ACCESS  read-only
      DESCRIPTION
         "Write access is not required."

      OBJECT      inetCidrRouteMetric1
      MIN-ACCESS  read-only
      DESCRIPTION
         "Write access is not required."

      OBJECT      inetCidrRouteMetric2
      MIN-ACCESS  read-only
      DESCRIPTION
         "Write access is not required."

      OBJECT      inetCidrRouteMetric3
      MIN-ACCESS  read-only
      DESCRIPTION
         "Write access is not required."

      OBJECT      inetCidrRouteMetric4
      MIN-ACCESS  read-only
      DESCRIPTION
         "Write access is not required."

      OBJECT      inetCidrRouteMetric5
      MIN-ACCESS  read-only
      DESCRIPTION
         "Write access is not required."

      OBJECT      inetCidrRouteStatus
      SYNTAX      RowStatus { active(1) }
      MIN-ACCESS  read-only
      DESCRIPTION
         "Write access is not required."

      ::= { ipForwardCompliances 4 }

   -- units of conformance

   inetForwardCidrRouteGroup OBJECT-GROUP
       OBJECTS { inetCidrRouteDiscards,
                 inetCidrRouteIfIndex, inetCidrRouteType,
                 inetCidrRouteProto, inetCidrRouteAge,



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                 inetCidrRouteNextHopAS, inetCidrRouteMetric1,
                 inetCidrRouteMetric2, inetCidrRouteMetric3,
                 inetCidrRouteMetric4, inetCidrRouteMetric5,
                 inetCidrRouteStatus, inetCidrRouteNumber
           }
       STATUS     current
       DESCRIPTION
              "The IP version-independent CIDR Route Table."
       ::= { ipForwardGroups 4 }

   --  Deprecated Objects

   ipCidrRouteNumber OBJECT-TYPE
       SYNTAX     Gauge32
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
              "The number of current ipCidrRouteTable entries that are
               not invalid.  This object is deprecated in favor of
               inetCidrRouteNumber and the inetCidrRouteTable."
       ::= { ipForward 3 }

   --  IP CIDR Route Table

   --  The IP CIDR Route Table obsoletes and replaces the ipRoute
   --  Table current in MIB-I and MIB-II and the IP Forwarding Table.
   --  It adds knowledge of the autonomous system of the next hop,
   --  multiple next hops, policy routing, and Classless
   --  Inter-Domain Routing.

   ipCidrRouteTable OBJECT-TYPE
       SYNTAX     SEQUENCE OF IpCidrRouteEntry
       MAX-ACCESS not-accessible
       STATUS     deprecated
       DESCRIPTION
              "This entity's IP Routing table.  This table has been
               deprecated in favor of the IP version neutral
               inetCidrRouteTable."
       REFERENCE
              "<a href="./rfc1213#section-6.6">RFC 1213 Section&nbsp;6.6</a>, The IP Group"
       ::= { ipForward 4 }

   ipCidrRouteEntry OBJECT-TYPE
       SYNTAX     IpCidrRouteEntry
       MAX-ACCESS not-accessible
       STATUS     deprecated
       DESCRIPTION
              "A particular route to a particular destination, under a



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               particular policy."
       INDEX {
           ipCidrRouteDest,
           ipCidrRouteMask,
           ipCidrRouteTos,
           ipCidrRouteNextHop
           }
          ::= { ipCidrRouteTable 1 }

   IpCidrRouteEntry ::= SEQUENCE {
           ipCidrRouteDest       IpAddress,
           ipCidrRouteMask       IpAddress,
           ipCidrRouteTos        Integer32,
           ipCidrRouteNextHop    IpAddress,
           ipCidrRouteIfIndex    Integer32,
           ipCidrRouteType       INTEGER,
           ipCidrRouteProto      INTEGER,
           ipCidrRouteAge        Integer32,
           ipCidrRouteInfo       OBJECT IDENTIFIER,
           ipCidrRouteNextHopAS  Integer32,
           ipCidrRouteMetric1    Integer32,
           ipCidrRouteMetric2    Integer32,
           ipCidrRouteMetric3    Integer32,
           ipCidrRouteMetric4    Integer32,
           ipCidrRouteMetric5    Integer32,
           ipCidrRouteStatus     RowStatus
       }

   ipCidrRouteDest OBJECT-TYPE
       SYNTAX     IpAddress
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
              "The destination IP address of this route.

               This object may not take a Multicast (Class D) address
               value.

               Any assignment (implicit or otherwise) of an instance
               of this object to a value x must be rejected if the
               bitwise logical-AND of x with the value of the
               corresponding instance of the ipCidrRouteMask object is
               not equal to x."
       ::= { ipCidrRouteEntry 1 }

   ipCidrRouteMask OBJECT-TYPE
       SYNTAX     IpAddress
       MAX-ACCESS read-only



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       STATUS     deprecated
       DESCRIPTION
              "Indicate the mask to be logical-ANDed with the
               destination address before being compared to the value
               in the ipCidrRouteDest field.  For those systems that
               do not support arbitrary subnet masks, an agent
               constructs the value of the ipCidrRouteMask by
               reference to the IP Address Class.

               Any assignment (implicit or otherwise) of an instance
               of this object to a value x must be rejected if the
               bitwise logical-AND of x with the value of the
               corresponding instance of the ipCidrRouteDest object is
               not equal to ipCidrRouteDest."
       ::= { ipCidrRouteEntry 2 }

   -- The following convention is included for specification
   -- of TOS Field contents.  At this time, the Host Requirements
   -- and the Router Requirements documents disagree on the width
   -- of the TOS field.  This mapping describes the Router
   -- Requirements mapping, and leaves room to widen the TOS field
   -- without impact to fielded systems.

   ipCidrRouteTos OBJECT-TYPE
       SYNTAX     Integer32 (0..2147483647)
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
              "The policy specifier is the IP TOS Field.  The encoding
               of IP TOS is as specified by the following convention.
               Zero indicates the default path if no more specific
               policy applies.

               +-----+-----+-----+-----+-----+-----+-----+-----+
               |                 |                       |     |
               |   PRECEDENCE    |    TYPE OF SERVICE    |  0  |
               |                 |                       |     |
               +-----+-----+-----+-----+-----+-----+-----+-----+

                            IP TOS                IP TOS
                  Field     Policy      Field     Policy
                  Contents    Code      Contents    Code
                  0 0 0 0  ==&gt;   0      0 0 0 1  ==&gt;   2
                  0 0 1 0  ==&gt;   4      0 0 1 1  ==&gt;   6
                  0 1 0 0  ==&gt;   8      0 1 0 1  ==&gt;  10
                  0 1 1 0  ==&gt;  12      0 1 1 1  ==&gt;  14
                  1 0 0 0  ==&gt;  16      1 0 0 1  ==&gt;  18
                  1 0 1 0  ==&gt;  20      1 0 1 1  ==&gt;  22



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                  1 1 0 0  ==&gt;  24      1 1 0 1  ==&gt;  26
                  1 1 1 0  ==&gt;  28      1 1 1 1  ==&gt;  30"
       ::= { ipCidrRouteEntry 3 }

   ipCidrRouteNextHop OBJECT-TYPE
       SYNTAX     IpAddress
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
              "On remote routes, the address of the next system en
               route; Otherwise, 0.0.0.0."
       ::= { ipCidrRouteEntry 4 }

   ipCidrRouteIfIndex OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     deprecated
       DESCRIPTION
              "The ifIndex value that identifies the local interface
               through which the next hop of this route should be
               reached."
       DEFVAL { 0 }
       ::= { ipCidrRouteEntry 5 }

   ipCidrRouteType OBJECT-TYPE
       SYNTAX     INTEGER {
                   other    (1), -- not specified by this MIB
                   reject   (2), -- route that discards traffic
                   local    (3), -- local interface
                   remote   (4)  -- remote destination
                }
       MAX-ACCESS read-create
       STATUS     deprecated
       DESCRIPTION
              "The type of route.  Note that local(3) refers to a
               route for which the next hop is the final destination;
               remote(4) refers to a route for which the next hop is
               not the final destination.

               Routes that do not result in traffic forwarding or
               rejection should not be displayed, even if the
               implementation keeps them stored internally.

               reject (2) refers to a route that, if matched,
               discards the message as unreachable.  This is used in
               some protocols as a means of correctly aggregating
               routes."
       ::= { ipCidrRouteEntry 6 }



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   ipCidrRouteProto OBJECT-TYPE
       SYNTAX     INTEGER {
                   other     (1),  -- not specified
                   local     (2),  -- local interface
                   netmgmt   (3),  -- static route
                   icmp      (4),  -- result of ICMP Redirect

                           -- the following are all dynamic
                           -- routing protocols
                   egp        (5),  -- Exterior Gateway Protocol
                   ggp        (6),  -- Gateway-Gateway Protocol
                   hello      (7),  -- FuzzBall HelloSpeak
                   rip        (8),  -- Berkeley RIP or RIP-II
                   isIs       (9),  -- Dual IS-IS
                   esIs       (10), -- ISO 9542
                   ciscoIgrp  (11), -- Cisco IGRP
                   bbnSpfIgp  (12), -- BBN SPF IGP
                   ospf       (13), -- Open Shortest Path First
                   bgp        (14), -- Border Gateway Protocol
                   idpr       (15), -- InterDomain Policy Routing
                   ciscoEigrp (16)  -- Cisco EIGRP
                }
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
              "The routing mechanism via which this route was learned.
               Inclusion of values for gateway routing protocols is
               not intended to imply that hosts should support those
               protocols."
       ::= { ipCidrRouteEntry 7 }

   ipCidrRouteAge OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
              "The number of seconds since this route was last updated
               or otherwise determined to be correct.  Note that no
               semantics of `too old' can be implied, except through
               knowledge of the routing protocol by which the route
               was learned."
       DEFVAL  { 0 }
       ::= { ipCidrRouteEntry 8 }

   ipCidrRouteInfo OBJECT-TYPE
       SYNTAX     OBJECT IDENTIFIER
       MAX-ACCESS read-create



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       STATUS     deprecated
       DESCRIPTION
              "A reference to MIB definitions specific to the
               particular routing protocol that is responsible for
               this route, as determined by the value specified in the
               route's ipCidrRouteProto value.  If this information is
               not present, its value should be set to the OBJECT
               IDENTIFIER { 0 0 }, which is a syntactically valid
               object identifier, and any implementation conforming to
               ASN.1 and the Basic Encoding Rules must be able to
               generate and recognize this value."
       ::= { ipCidrRouteEntry 9 }

   ipCidrRouteNextHopAS OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     deprecated
       DESCRIPTION
              "The Autonomous System Number of the Next Hop.  The
               semantics of this object are determined by the routing-
               protocol specified in the route's ipCidrRouteProto
               value.  When this object is unknown or not relevant, its
               value should be set to zero."
       DEFVAL { 0 }
       ::= { ipCidrRouteEntry 10 }

   ipCidrRouteMetric1 OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     deprecated
       DESCRIPTION
              "The primary routing metric for this route.  The
               semantics of this metric are determined by the routing-
               protocol specified in the route's ipCidrRouteProto
               value.  If this metric is not used, its value should be
               set to -1."
       DEFVAL { -1 }
       ::= { ipCidrRouteEntry 11 }

   ipCidrRouteMetric2 OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     deprecated
       DESCRIPTION
              "An alternate routing metric for this route.  The
               semantics of this metric are determined by the routing-
               protocol specified in the route's ipCidrRouteProto
               value.  If this metric is not used, its value should be



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               set to -1."
       DEFVAL { -1 }
       ::= { ipCidrRouteEntry 12 }

   ipCidrRouteMetric3 OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     deprecated
       DESCRIPTION
              "An alternate routing metric for this route.  The
               semantics of this metric are determined by the routing-
               protocol specified in the route's ipCidrRouteProto
               value.  If this metric is not used, its value should be
               set to -1."
       DEFVAL { -1 }
       ::= { ipCidrRouteEntry 13 }

   ipCidrRouteMetric4 OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     deprecated
       DESCRIPTION
              "An alternate routing metric for this route.  The
               semantics of this metric are determined by the routing-
               protocol specified in the route's ipCidrRouteProto
               value.  If this metric is not used, its value should be
               set to -1."
       DEFVAL { -1 }
       ::= { ipCidrRouteEntry 14 }

   ipCidrRouteMetric5 OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     deprecated
       DESCRIPTION
              "An alternate routing metric for this route.  The
               semantics of this metric are determined by the routing-
               protocol specified in the route's ipCidrRouteProto
               value.  If this metric is not used, its value should be
               set to -1."
       DEFVAL { -1 }
       ::= { ipCidrRouteEntry 15 }

   ipCidrRouteStatus OBJECT-TYPE
       SYNTAX     RowStatus
       MAX-ACCESS read-create
       STATUS     deprecated
       DESCRIPTION



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              "The row status variable, used according to row
               installation and removal conventions."
       ::= { ipCidrRouteEntry 16 }

   -- compliance statements

   ipForwardCompliance MODULE-COMPLIANCE
       STATUS     deprecated
       DESCRIPTION
              "The compliance statement for SNMPv2 entities that
               implement the ipForward MIB.

               This compliance statement has been deprecated and
               replaced with ipForwardFullCompliance and
               ipForwardReadOnlyCompliance."

      MODULE  -- this module
      MANDATORY-GROUPS { ipForwardCidrRouteGroup }

      ::= { ipForwardCompliances 1 }

   -- units of conformance

   ipForwardCidrRouteGroup OBJECT-GROUP
       OBJECTS { ipCidrRouteNumber,
                 ipCidrRouteDest, ipCidrRouteMask, ipCidrRouteTos,
                 ipCidrRouteNextHop, ipCidrRouteIfIndex,
                 ipCidrRouteType, ipCidrRouteProto, ipCidrRouteAge,
                 ipCidrRouteInfo,ipCidrRouteNextHopAS,
                 ipCidrRouteMetric1, ipCidrRouteMetric2,
                 ipCidrRouteMetric3, ipCidrRouteMetric4,
                 ipCidrRouteMetric5, ipCidrRouteStatus
           }
       STATUS     deprecated
       DESCRIPTION
              "The CIDR Route Table.

               This group has been deprecated and replaced with
               inetForwardCidrRouteGroup."
       ::= { ipForwardGroups 3 }

   -- Obsoleted Definitions - Objects

   ipForwardNumber OBJECT-TYPE
       SYNTAX     Gauge32
       MAX-ACCESS read-only
       STATUS     obsolete
       DESCRIPTION



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              "The number of current ipForwardTable entries that are
               not invalid."
       ::= { ipForward 1 }

   --  IP Forwarding Table

   --  The IP Forwarding Table obsoletes and replaces the ipRoute
   --  Table current in MIB-I and MIB-II.  It adds knowledge of
   --  the autonomous system of the next hop, multiple next hop
   --  support, and policy routing support.

   ipForwardTable OBJECT-TYPE
       SYNTAX     SEQUENCE OF IpForwardEntry
       MAX-ACCESS not-accessible
       STATUS     obsolete
       DESCRIPTION
              "This entity's IP Routing table."
       REFERENCE
              "<a href="./rfc1213#section-6.6">RFC 1213 Section&nbsp;6.6</a>, The IP Group"
       ::= { ipForward 2 }

   ipForwardEntry OBJECT-TYPE
       SYNTAX     IpForwardEntry
       MAX-ACCESS not-accessible
       STATUS     obsolete
       DESCRIPTION
              "A particular route to a particular destination, under a
               particular policy."
       INDEX {
           ipForwardDest,
           ipForwardProto,
           ipForwardPolicy,
           ipForwardNextHop
           }
       ::= { ipForwardTable 1 }

   IpForwardEntry ::= SEQUENCE {
           ipForwardDest       IpAddress,
           ipForwardMask       IpAddress,
           ipForwardPolicy     Integer32,
           ipForwardNextHop    IpAddress,
           ipForwardIfIndex    Integer32,
           ipForwardType       INTEGER,
           ipForwardProto      INTEGER,
           ipForwardAge        Integer32,
           ipForwardInfo       OBJECT IDENTIFIER,
           ipForwardNextHopAS  Integer32,
           ipForwardMetric1    Integer32,



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           ipForwardMetric2    Integer32,
           ipForwardMetric3    Integer32,
           ipForwardMetric4    Integer32,
           ipForwardMetric5    Integer32
       }

   ipForwardDest OBJECT-TYPE
       SYNTAX     IpAddress
       MAX-ACCESS read-only
       STATUS     obsolete
       DESCRIPTION
              "The destination IP address of this route.  An entry
               with a value of 0.0.0.0 is considered a default route.

               This object may not take a Multicast (Class D) address
               value.

               Any assignment (implicit or otherwise) of an instance
               of this object to a value x must be rejected if the
               bitwise logical-AND of x with the value of the
               corresponding instance of the ipForwardMask object is
               not equal to x."
       ::= { ipForwardEntry 1 }

   ipForwardMask OBJECT-TYPE
       SYNTAX     IpAddress
       MAX-ACCESS read-create
       STATUS     obsolete
       DESCRIPTION
              "Indicate the mask to be logical-ANDed with the
               destination address before being compared to the value
               in the ipForwardDest field.  For those systems that do
               not support arbitrary subnet masks, an agent constructs
               the value of the ipForwardMask by reference to the IP
               Address Class.

               Any assignment (implicit or otherwise) of an instance
               of this object to a value x must be rejected if the
               bitwise logical-AND of x with the value of the
               corresponding instance of the ipForwardDest object is
               not equal to ipForwardDest."
       DEFVAL { '00000000'H }      -- 0.0.0.0
       ::= { ipForwardEntry 2 }

   -- The following convention is included for specification
   -- of TOS Field contents.  At this time, the Host Requirements
   -- and the Router Requirements documents disagree on the width
   -- of the TOS field.  This mapping describes the Router



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   -- Requirements mapping, and leaves room to widen the TOS field
   -- without impact to fielded systems.

   ipForwardPolicy OBJECT-TYPE
       SYNTAX     Integer32 (0..2147483647)
       MAX-ACCESS read-only
       STATUS     obsolete
       DESCRIPTION
              "The general set of conditions that would cause
               the selection of one multipath route (set of
               next hops for a given destination) is referred
               to as 'policy'.

               Unless the mechanism indicated by ipForwardProto
               specifies otherwise, the policy specifier is
               the IP TOS Field.  The encoding of IP TOS is as
               specified by the following convention.  Zero
               indicates the default path if no more specific
               policy applies.

               +-----+-----+-----+-----+-----+-----+-----+-----+
               |                 |                       |     |
               |   PRECEDENCE    |    TYPE OF SERVICE    |  0  |
               |                 |                       |     |
               +-----+-----+-----+-----+-----+-----+-----+-----+



                            IP TOS                IP TOS
                  Field     Policy      Field     Policy
                  Contents    Code      Contents    Code
                  0 0 0 0  ==&gt;   0      0 0 0 1  ==&gt;   2
                  0 0 1 0  ==&gt;   4      0 0 1 1  ==&gt;   6
                  0 1 0 0  ==&gt;   8      0 1 0 1  ==&gt;  10
                  0 1 1 0  ==&gt;  12      0 1 1 1  ==&gt;  14
                  1 0 0 0  ==&gt;  16      1 0 0 1  ==&gt;  18
                  1 0 1 0  ==&gt;  20      1 0 1 1  ==&gt;  22
                  1 1 0 0  ==&gt;  24      1 1 0 1  ==&gt;  26
                  1 1 1 0  ==&gt;  28      1 1 1 1  ==&gt;  30

               Protocols defining 'policy' otherwise must either
               define a set of values that are valid for
               this object or must implement an integer-instanced
               policy table for which this object's
               value acts as an index."
       ::= { ipForwardEntry 3 }

   ipForwardNextHop OBJECT-TYPE



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       SYNTAX     IpAddress
       MAX-ACCESS read-only
       STATUS     obsolete
       DESCRIPTION
              "On remote routes, the address of the next system en
               route; otherwise, 0.0.0.0."
       ::= { ipForwardEntry 4 }

   ipForwardIfIndex OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     obsolete
       DESCRIPTION
              "The ifIndex value that identifies the local interface
               through which the next hop of this route should be
               reached."
       DEFVAL { 0 }
       ::= { ipForwardEntry 5 }

   ipForwardType OBJECT-TYPE
       SYNTAX     INTEGER {
                   other    (1), -- not specified by this MIB
                   invalid  (2), -- logically deleted
                   local    (3), -- local interface
                   remote   (4)  -- remote destination
                }
       MAX-ACCESS read-create
       STATUS     obsolete
       DESCRIPTION
              "The type of route.  Note that local(3) refers to a
               route for which the next hop is the final destination;
               remote(4) refers to a route for which the next hop is
               not the final destination.

               Setting this object to the value invalid(2) has the
               effect of invalidating the corresponding entry in the
               ipForwardTable object.  That is, it effectively
               disassociates the destination identified with said
               entry from the route identified with said entry.  It is
               an implementation-specific matter as to whether the
               agent removes an invalidated entry from the table.
               Accordingly, management stations must be prepared to
               receive tabular information from agents that
               corresponds to entries not currently in use.  Proper
               interpretation of such entries requires examination of
               the relevant ipForwardType object."
       DEFVAL { invalid }
       ::= { ipForwardEntry 6 }



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   ipForwardProto OBJECT-TYPE
       SYNTAX     INTEGER {
                   other     (1),  -- not specified
                   local     (2),  -- local interface
                   netmgmt   (3),  -- static route
                   icmp      (4),  -- result of ICMP Redirect

                           -- the following are all dynamic
                           -- routing protocols
                   egp       (5),  -- Exterior Gateway Protocol
                   ggp       (6),  -- Gateway-Gateway Protocol
                   hello     (7),  -- FuzzBall HelloSpeak
                   rip       (8),  -- Berkeley RIP or RIP-II
                   is-is     (9),  -- Dual IS-IS
                   es-is     (10), -- ISO 9542
                   ciscoIgrp (11), -- Cisco IGRP
                   bbnSpfIgp (12), -- BBN SPF IGP
                   ospf      (13), -- Open Shortest Path First
                   bgp       (14), -- Border Gateway Protocol
                   idpr      (15)  -- InterDomain Policy Routing
                }
       MAX-ACCESS read-only
       STATUS     obsolete
       DESCRIPTION
              "The routing mechanism via which this route was learned.
               Inclusion of values for gateway routing protocols is
               not intended to imply that hosts should support those
               protocols."
       ::= { ipForwardEntry 7 }

   ipForwardAge OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-only
       STATUS     obsolete
       DESCRIPTION
              "The number of seconds since this route was last updated
               or otherwise determined to be correct.  Note that no
               semantics of `too old' can be implied except through
               knowledge of the routing protocol by which the route
               was learned."
       DEFVAL  { 0 }
       ::= { ipForwardEntry 8 }

   ipForwardInfo OBJECT-TYPE
       SYNTAX     OBJECT IDENTIFIER
       MAX-ACCESS read-create
       STATUS     obsolete



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       DESCRIPTION
              "A reference to MIB definitions specific to the
               particular routing protocol that is responsible for
               this route, as determined by the value specified in the
               route's ipForwardProto value.  If this information is
               not present, its value should be set to the OBJECT
               IDENTIFIER { 0 0 }, which is a syntactically valid
               object identifier, and any implementation conforming to
               ASN.1 and the Basic Encoding Rules must be able to
               generate and recognize this value."
       ::= { ipForwardEntry 9 }

   ipForwardNextHopAS OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     obsolete
       DESCRIPTION
              "The Autonomous System Number of the Next Hop.  When
               this is unknown or not relevant to the protocol
               indicated by ipForwardProto, zero."
       DEFVAL { 0 }
       ::= { ipForwardEntry 10 }

   ipForwardMetric1 OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     obsolete
       DESCRIPTION
              "The primary routing metric for this route.  The
               semantics of this metric are determined by the routing-
               protocol specified in the route's ipForwardProto value.
               If this metric is not used, its value should be set to
               -1."
       DEFVAL { -1 }
       ::= { ipForwardEntry 11 }

   ipForwardMetric2 OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     obsolete
       DESCRIPTION
              "An alternate routing metric for this route.  The
               semantics of this metric are determined by the routing-
               protocol specified in the route's ipForwardProto value.
               If this metric is not used, its value should be set to
               -1."
       DEFVAL { -1 }
       ::= { ipForwardEntry 12 }



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   ipForwardMetric3 OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     obsolete
       DESCRIPTION
              "An alternate routing metric for this route.  The
               semantics of this metric are determined by the routing-
               protocol specified in the route's ipForwardProto value.
               If this metric is not used, its value should be set to
               -1."
       DEFVAL { -1 }
       ::= { ipForwardEntry 13 }

   ipForwardMetric4 OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     obsolete
       DESCRIPTION
              "An alternate routing metric for this route.  The
               semantics of this metric are determined by the routing-
               protocol specified in the route's ipForwardProto value.
               If this metric is not used, its value should be set to
               -1."
       DEFVAL { -1 }
       ::= { ipForwardEntry 14 }

   ipForwardMetric5 OBJECT-TYPE
       SYNTAX     Integer32
       MAX-ACCESS read-create
       STATUS     obsolete
       DESCRIPTION
              "An alternate routing metric for this route.  The
               semantics of this metric are determined by the routing-
               protocol specified in the route's ipForwardProto value.
               If this metric is not used, its value should be set to
               -1."
       DEFVAL { -1 }
       ::= { ipForwardEntry 15 }

   -- Obsoleted Definitions - Groups
   -- compliance statements

   ipForwardOldCompliance MODULE-COMPLIANCE
       STATUS     obsolete
       DESCRIPTION
              "The compliance statement for SNMP entities that
               implement the ipForward MIB."



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      MODULE  -- this module
      MANDATORY-GROUPS { ipForwardMultiPathGroup }

      ::= { ipForwardCompliances 2 }

   ipForwardMultiPathGroup OBJECT-GROUP
       OBJECTS { ipForwardNumber,
                 ipForwardDest, ipForwardMask, ipForwardPolicy,
                 ipForwardNextHop, ipForwardIfIndex, ipForwardType,
                 ipForwardProto, ipForwardAge, ipForwardInfo,
                 ipForwardNextHopAS,
                 ipForwardMetric1, ipForwardMetric2, ipForwardMetric3,
                 ipForwardMetric4, ipForwardMetric5
           }
       STATUS     obsolete
       DESCRIPTION
              "IP Multipath Route Table."
       ::= { ipForwardGroups 2 }

   END

<span class="h2"><a class="selflink" id="section-6" href="#section-6">6</a>.  Security Considerations</span>

   There are a number of management objects defined in this MIB module
   with a MAX-ACCESS clause of read-write and/or read-create.  Such
   objects may be considered sensitive or vulnerable in some network
   environments.  The support for SET operations in a non-secure
   environment without proper protection can have a negative effect on
   network operations.  These are the tables and objects and their
   sensitivity/vulnerability:

      1. The inetCidrRouteTable contains routing and forwarding
         information that is critical to the operation of the network
         node (especially routers).  Allowing unauthenticated write
         access to this table can compromise the validity of the
         forwarding information.

   Some of the readable objects in this MIB module (i.e., objects with a
   MAX-ACCESS other than not-accessible) may be considered sensitive or
   vulnerable in some network environments.  It is thus important to
   control even GET and/or NOTIFY access to these objects and possibly
   to even encrypt the values of these objects when sending them over
   the network via SNMP.  These are the tables and objects and their
   sensitivity/vulnerability:

      1. The inetCidrRouteTable contains routing and forwarding
         information that can be used to compromise a network.



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         Specifically, this table can be used to construct a map of the
         network in preparation for a denial-of-service attack on the
         network infrastructure.

      2. The inetCidrRouteProto object identifies the routing protocols
         in use within a network.  This information can be used to
         determine how a denial-of-service attack should be launched.

   SNMP versions prior to SNMPv3 did not include adequate security.
   Even if the network itself is secure (for example by using IPSec),
   even then, there is no control as to who on the secure network is
   allowed to access and GET/SET (read/change/create/delete) the objects
   in this MIB module.

   It is RECOMMENDED that implementers consider the security features as
   provided by the SNMPv3 framework (see <a href="./rfc3410#section-8">[RFC3410], section&nbsp;8</a>),
   including full support for the SNMPv3 cryptographic mechanisms (for
   authentication and privacy).

   Further, deployment of SNMP versions prior to SNMPv3 is NOT
   RECOMMENDED.  Instead, it is RECOMMENDED to deploy SNMPv3 and to
   enable cryptographic security.  It is then a customer/operator
   responsibility to ensure that the SNMP entity giving access to an
   instance of this MIB module is properly configured to give access to
   the objects only to those principals (users) that have legitimate
   rights to indeed GET or SET (change/create/delete) them.

<span class="h2"><a class="selflink" id="section-7" href="#section-7">7</a>.  Changes from <a href="./rfc2096">RFC 2096</a></span>

   This document obsoletes <a href="./rfc2096">RFC 2096</a> in the following ways:

      1. Replaces ipCidrRouteTable with inetCidrRouteTable.  This
         applies to corresponding objects and conformance statements.

      2. Utilizes the InetAddress TC to support IP version-independent
         implementations of the forwarding MIB.  This gives common
         forwarding MIB support for IPv4 and IPv6.

      3. Creates a read-only conformance statement to support
         implementations that only wish to retrieve data.

      4. Creates the inetCidrRouteDiscards object to replace the
         deprecated ipRoutingDiscards and ipv6DiscardedRoutes objects.

   The inetCidrRouteTable retains the logical structure of the
   ipCidrRouteTable in order to allow the easy upgrade of existing IPv4
   implementations to the version-independent MIB.




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<span class="h2"><a class="selflink" id="section-8" href="#section-8">8</a>.  Normative References</span>

   [<a id="ref-RFC2119">RFC2119</a>] Bradner, S., "Key words for use in RFCs to Indicate
             Requirement Levels", <a href="https://www.rfc-editor.org/bcp/bcp14">BCP 14</a>, <a href="./rfc2119">RFC 2119</a>, March 1997.

   [<a id="ref-RFC2578">RFC2578</a>] McCloghrie, K., Perkins, D., and J. Schoenwaelder,
             "Structure of Management Information Version 2 (SMIv2)",
             STD 58, <a href="./rfc2578">RFC 2578</a>, April 1999.

   [<a id="ref-RFC2579">RFC2579</a>] McCloghrie, K., Perkins, D., and J. Schoenwaelder, "Textual
             Conventions for SMIv2", STD 58, <a href="./rfc2579">RFC 2579</a>, April 1999.

   [<a id="ref-RFC2580">RFC2580</a>] McCloghrie, K., Perkins, D., and J. Schoenwaelder,
             "Conformance Statements for SMIv2", STD 58, <a href="./rfc2580">RFC 2580</a>, April
             1999.

   [<a id="ref-RFC2863">RFC2863</a>] McCloghrie, K. and F. Kastenholz, "The Interfaces Group
             MIB", <a href="./rfc2863">RFC 2863</a>, June 2000.

   [<a id="ref-RFC4001">RFC4001</a>] Daniele, M., Haberman, B., Routhier, S., and J.
             Schoenwaelder, "Textual Conventions for Internet Network
             Addresses", <a href="./rfc4001">RFC 4001</a>, February 2005.

   [<a id="ref-RFC4293">RFC4293</a>] Routhier, S., Ed., "Management Information Base for the
             Internet Protocol (IP), <a href="./rfc4293">RFC 4293</a>, April 2006.

   [<a id="ref-RTPROTO">RTPROTO</a>] IANA, "IP Route Protocol MIB",
             <a href="http://www.iana.org/assignments/ianaiprouteprotocol-mib">http://www.iana.org/assignments/ianaiprouteprotocol-mib</a>,
             September 2000.

<span class="h2"><a class="selflink" id="section-9" href="#section-9">9</a>.  Informative References</span>

   [<a id="ref-RFC1213">RFC1213</a>] McCloghrie, K. and M. Rose, "Management Information Base
             for Network Management of TCP/IP-based internets: MIB-II",
             <a href="./rfc1213">RFC 1213</a>, March 1991.

   [<a id="ref-RFC1354">RFC1354</a>] Baker, F., "IP Forwarding Table MIB", <a href="./rfc1354">RFC 1354</a>, July 1992.

   [<a id="ref-RFC2011">RFC2011</a>] McCloghrie, K., Editor, "SNMPv2 Management Information Base
             for the Internet Protocol using SMIv2", <a href="./rfc2011">RFC 2011</a>, November
             1996.

   [<a id="ref-RFC2096">RFC2096</a>] Baker, F., "IP Forwarding Table MIB", <a href="./rfc2096">RFC 2096</a>, January
             1997.

   [<a id="ref-RFC3410">RFC3410</a>] Case, J., Mundy, R., Partain, D., and B. Stewart,
             "Introduction and Applicability Statements for Internet-
             Standard Management Framework", <a href="./rfc3410">RFC 3410</a>, December 2002.



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   [<a id="ref-RFC2465">RFC2465</a>] Haskin, D. and S. Onishi, Management Information Base for
             IP Version 6: Textual Conventions and General Group", <a href="./rfc2465">RFC</a>
             <a href="./rfc2465">2465</a>, December 1998.


<span class="h2"><a class="selflink" id="section-10" href="#section-10">10</a>.  Authors and Acknowledgements</span>

   This document was based on <a href="./rfc2096">RFC 2096</a> [<a href="./rfc2096" title="&quot;IP Forwarding Table MIB&quot;">RFC2096</a>].

   The following people provided text for this version of the document,
   or were authors of previous versions:

   Fred Baker, Cisco
   Bill Fenner, AT&amp;T Research
   Brian Haberman, Johns Hopkins University - Applied Physics Laboratory
   Juergen Schoenwalder, TU Braunschweig
   Dave Thaler, Microsoft
   Margaret Wasserman, Thingmagic

   Dario Accornero, Mark Adam, Qing Li, and Shawn Routhier reviewed the
   document and provided helpful feedback.

   Mike Heard provided valuable feedback as the MIB Doctor for this
   document.

Editors' Contact Information

   Comments or questions regarding this document should be sent to:

   Brian Haberman
   Johns Hopkins University - Applied Physics Laboratory
   Mailstop 17-S442
   11100 Johns Hopkins Road
   Laurel MD,  20723-6099  USA

   Phone: +1-443-778-1319
   EMail: brian@innovationslab.net














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Full Copyright Statement

   Copyright (C) The Internet Society (2006).

   This document is subject to the rights, licenses and restrictions
   contained in <a href="https://www.rfc-editor.org/bcp/bcp78">BCP 78</a>, and except as set forth therein, the authors
   retain all their rights.

   This document and the information contained herein are provided on an
   "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
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   such proprietary rights by implementers or users of this
   specification can be obtained from the IETF on-line IPR repository at
   <a href="http://www.ietf.org/ipr">http://www.ietf.org/ipr</a>.

   The IETF invites any interested party to bring to its attention any
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Acknowledgement

   Funding for the RFC Editor function is provided by the IETF
   Administrative Support Activity (IASA).







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