IP Routing: RIP Configuration Guide, Cisco IOS XE Release 3S
RIPv2 Monitoring with SNMP Using the RFC 1724 MIB Extensions
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RIPv2 Monitoring with SNMP Using the RFC 1724 MIB Extensions

Contents

RIPv2 Monitoring with SNMP Using the RFC 1724 MIB Extensions

This document describes the Cisco IOS XE implementation of RFC 1724, RIP Version 2 MIB Extensions . RFC 1724 defines Management Information Base (MIB) objects that allow you to monitor RIPv2 using the Simple Network Management Protocol (SNMP).

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Prerequisites for RIPv2 Monitoring with SNMP Using the RFC 1724 MIB Extensions

  • RIPv2 must be configured on the router.
  • Your SNMP Network Management Station (NMS) must have the RFC 1724 RIPv2 MIB installed.
  • Your SNMP NMS must have the following MIBs installed because RFC 1724 imports data types and object identifiers (OIDs) from them:
    • SNMPv2-SMI
    • SNMPv2-TC
    • SNMPv2-CONF
    • RFC1213-MIB

Restrictions for RIPv2 Monitoring with SNMP Using the RFC 1724 MIB Extensions

This implementation of the RIPv2 MIB does not track any data associated with a RIP Virtual Routing and Forwarding (VRF) instance. Only interfaces that are assigned IP addresses in the IP address space configured by the network command in RIP router configuration mode are tracked. Global data is tracked only for changes to the main routing table.

Information About RIPv2 Monitoring with SNMP Using the RFC 1724 MIB Extensions

The following sections contain information about the MIB objects standardized as part of RFC 1724 and the benefits of the RFC 1724 MIB.

RIPv2 MIB

This section describes the MIB objects that are provided by RFC 1724 definitions. The RIPv2 MIB consists of the following managed objects:

  • Global counters--Used to keep track of changing routes or neighbor changes.
  • Interface status table--Defines objects that are used to keep track of statistics specific to interfaces.
  • Interface configuration table--Defines objects that are used to keep track of interface configuration statistics.
  • Peer table--Defined to monitor neighbor relationships. This object is not implemented in Cisco IOS XE software.

The tables below show the objects that are provided by RFC 1724 RIPv2 MIB definitions. The objects are listed in the order in which they appear within the RFC 1724 RIPv2 MIB, per the tables that describe them. The statistics for all of the objects in the global counters can be obtained by querying the rip2Globals object identifier (OID) using snmpwalk, or a similar SNMP toolset command on your NMS.

The table below shows the RFC 1724 RIPv2 MIB global counter objects.

Table 1 RFC 1724 RIPv2 MIB Global Counters Objects

Global Counter

Object

Description

rip2Globals

rip2GlobalRouteChanges

Number of route changes made to the IP route database by RIP. Number is incremented when a route is modified.

rip2GlobalQueries

Number of responses sent to RIP queries from other systems. Number is incremented when RIP responds to a query from another system.

The objects in the RFC 1724 RIPv2 MIB interface table track information on a per interface basis. All object in the RFC 1724 RIPv2 MIB interface table, except for the rip2IfStatAddress object, represent newly tracked data within RIP. There are no equivalent show commands for these objects. All objects in the RIPv2 MIB interface table are implemented read-only.

The table below shows the RFC 1724 RIPv2 MIB interface table objects. The statistics for all objects in the interface table can be obtained by querying the sequence name Rip2IfStatEntry using snmpwalk or a similar SNMP toolset command on your NMS.

Table 2 RFC 1724 RIPv2 MIB Interface Table Objects

Sequence Name

Object

Description

Rip2IfStatEntry

rip2IfStatAddress

The IP address of this system on the indicated subnet. For unnumbered interfaces, the value of 0.0.0.N, where the least significant 24 bits (N) are the ifIndex for the IP interface in network byte order.

rip2IfStatRcvBadPackets

The number of RIP response packets received by the RIP process that were subsequently discarded for any reason. For example, a version 0 packet or an unknown command type.

rip2IfStatRcvBadRoutes

The number of routes, in valid RIP packets, that were ignored for any reason. This is incremented when:

  • The address family identifier does not equal AF_INET.
  • If a RIP v2 update is received and the class D and greater.
  • If a RIP v2 update is received and the address is a martian address.

rip2IfStatSentUpdates

The number of triggered RIP updates actually sent on this interface. This explicitly does not include full updates sent containing new information.

rip2IfStatStatus

This value is always set to 1.

The objects in the RFC 1724 RIPv2 MIB interface configuration table track information on a per interface basis. Except for the Rip2IfConfAuthType object, the data for the objects in the RFC 1724 RIPv2 MIB interface configuration table can also be gathered with the show ip protocol commands. All objects in the RIPv2 MIB interface table are implemented read-only.

The table below shows the RIPv2 MIB interface configuration table objects. The statistics for all objects in the configuration table can be obtained by querying the sequence name rip2IfConfEntry using snmpwalk or a similar SNMP toolset command on your NMS.

Table 3 RFC 1724 RIPv2 MIB Interface Configuration Table Object Types

Sequence Name

Object Type

Description

rip2IfConfEntry

rip2IfConfAddress

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) are the ifIndex for the IP interface in network byte order.

rip2IfConfDomain

This value is always equal to "".

rip2IfConfAuthType

The type of authentication used on this interface.

rip2IfConfAuthKey

The value to be used as the authentication key whenever the corresponding instance of rip2IfConfAuthType has a value other than no authentication.

rip2IfConfSend

The version of RIP updates that are sent on this interface.

rip2IfConfReceive

The version of RIP updates that are accepted on this interface.

rip2IfConfDefaultMetric

This variable indicates the metric that is used for the default route entry in RIP updates originated on this interface.

rip2IfConfStatus

This value is always set to 1.

rip2IfConfSrcAddress

The IP address that 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.

Benefits of the RIPv2 MIB

The RFC 1724 RIPv2 MIB extensions allow network managers to monitor the RIPv2 routing protocol using SNMP through the addition of new global counters and table objects that previously were not supported by the RFC 1389 RIPv2 MIB. The new global counters and table objects are intended to facilitate quickly changing routes or failing neighbors.

SNMP Community Strings

Routers can have multiple read-only SNMP community strings. When you configure an SNMP read-only community string for the snmp-server command on the router, an existing SNMP snmp-server read-only community string is not overwritten. For example, if you enter the snmp-server community string1 ro and snmp-server community string2 ro commands on the router, the router will have two valid read-only community strings--string1 and string2. If this is not the behavior that you desire, use the no snmp-server community string ro command to remove an existing SNMP read-only community string. If you already have an SNMP read-only community string configured on your router, you do not need to perform this task. After you load Cisco IOS XE Release 2.1 or a later release on your router, you can use SNMP commands on your NMS to query the RFC 1724 RIPv2 MIB on your router.

How to Enable RIPv2 Monitoring with SNMP Using the RFC 1724 MIB Extensions

Enabling SNMP Read-Only Access on the Router

There are no router configuration tasks required for the RIPv2 Monitoring with SNMP Using the RFC 1724 MIB Extensions feature itself. SNMP read-only access to the objects in the RFC 1724 RIPv2 MIB is enabled when you configure the SNMP server read-only community string on the router. When you configure an SNMP server read-only community string on the router, you are granting SNMP read-only access to the objects that support read-only access in all MIBs that are available in the version of Cisco IOS XE that is running on the router.

Perform this task to configure the SNMP server read-only community string on the router to enable SNMP read-only access to MIB objects (including the RFC 1724 RIPv2 MIB extensions) on the router.

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    snmp-server community string1 ro

    4.    end


DETAILED STEPS
      Command or Action Purpose
    Step 1 enable


    Example:
    Router> enable
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.
     
    Step 2 configure terminal


    Example:
    Router# configure terminal
     

    Enters global configuration mode.

     
    Step 3 snmp-server community string1 ro


    Example:
    Router(config)# snmp-server community T8vCx3 ro
     

    Enables SNMP read-only access to the objects in the MIBs that are included in the version of Cisco IOS XE software that is running on the router.

    Note   

    For security purposes, do not use the standard default value of public for your read-only community string. Use a combination of uppercase and lowercase letters and numbers for the password.

     
    Step 4 end


    Example:
    Router(config)# end
     

    Ends your configuration session and returns to privileged EXEC mode.

     

    Verifying the Status of the RIPv2 RFC1724 MIB Extensions on the Router and Your Network Management Station

    Perform this optional task on your NMS to verify the status of the RFC 1724 RIPv2 MIB extensions on the router and on your NMS.

    Prerequisites

    Your NMS must have the RFC 1724 MIB installed.


    Note


    This task uses the NET-SNMP toolset that is available in the public domain. The step that is documented uses a terminal session on an NMS that is running Linux. Substitute the SNMP command from the SNMP toolset on your NMS as appropriate when you perform this task.


    SUMMARY STEPS

      1.    snmpwalk -m all -v2c ip-address -c read-only-community-string rip2Globals


    DETAILED STEPS
    snmpwalk -m all -v2c ip-address -c read-only-community-string rip2Globals

    Use the snmpwalk command for the rip2Globals object in the RFC 1724 RIPv2 MIB to display the data for the objects associated with this object. This step verifies that the NMS is configured to send queries for objects in the RFC 1724 RIPv2 MIB and that the router is configured to respond to the queries.



    Example:
    $ snmpwalk -m all -v2c 10.0.0.253 -c T8vCx3 rip2Globals
    RIPv2-MIB::rip2GlobalRouteChanges.0 = Counter32: 5
    RIPv2-MIB::rip2GlobalQueries.0 = Counter32: 1
    $

    Configuration Examples for RIPv2 Monitoring with SNMP Using the RIPv2 RFC1724 MIB Extensions

    Querying the RIP Interface Status Table Objects Example

    The following example shows how to send an SNMP query to obtain data for all objects in the RIP interface status table using the snmpwalk command.

    $ snmpwalk -m all -v2c 10.0.0.253 -c T8vCx3 Rip2IfStatEntry
    RIPv2-MIB::rip2IfStatAddress.10.0.0.253 = IpAddress: 10.0.0.253
    RIPv2-MIB::rip2IfStatAddress.172.16.1.1 = IpAddress: 172.16.1.1
    RIPv2-MIB::rip2IfStatAddress.172.16.2.1 = IpAddress: 172.16.2.1
    RIPv2-MIB::rip2IfStatAddress.172.17.1.1 = IpAddress: 172.17.1.1
    RIPv2-MIB::rip2IfStatAddress.172.17.2.1 = IpAddress: 172.17.2.1
    RIPv2-MIB::rip2IfStatRcvBadPackets.10.0.0.253 = Counter32: 0
    RIPv2-MIB::rip2IfStatRcvBadPackets.172.16.1.1 = Counter32: 1654
    RIPv2-MIB::rip2IfStatRcvBadPackets.172.16.2.1 = Counter32: 1652
    RIPv2-MIB::rip2IfStatRcvBadPackets.172.17.1.1 = Counter32: 1648
    RIPv2-MIB::rip2IfStatRcvBadPackets.172.17.2.1 = Counter32: 1649
    RIPv2-MIB::rip2IfStatRcvBadRoutes.10.0.0.253 = Counter32: 0
    RIPv2-MIB::rip2IfStatRcvBadRoutes.172.16.1.1 = Counter32: 0
    RIPv2-MIB::rip2IfStatRcvBadRoutes.172.16.2.1 = Counter32: 0
    RIPv2-MIB::rip2IfStatRcvBadRoutes.172.17.1.1 = Counter32: 0
    RIPv2-MIB::rip2IfStatRcvBadRoutes.172.17.2.1 = Counter32: 0
    RIPv2-MIB::rip2IfStatSentUpdates.10.0.0.253 = Counter32: 0
    RIPv2-MIB::rip2IfStatSentUpdates.172.16.1.1 = Counter32: 0
    RIPv2-MIB::rip2IfStatSentUpdates.172.16.2.1 = Counter32: 0
    RIPv2-MIB::rip2IfStatSentUpdates.172.17.1.1 = Counter32: 0
    RIPv2-MIB::rip2IfStatSentUpdates.172.17.2.1 = Counter32: 0
    RIPv2-MIB::rip2IfStatStatus.10.0.0.253 = INTEGER: active(1)
    RIPv2-MIB::rip2IfStatStatus.172.16.1.1 = INTEGER: active(1)
    RIPv2-MIB::rip2IfStatStatus.172.16.2.1 = INTEGER: active(1)
    RIPv2-MIB::rip2IfStatStatus.172.17.1.1 = INTEGER: active(1)
    RIPv2-MIB::rip2IfStatStatus.172.17.2.1 = INTEGER: active(1)
    

    The following example shows how to send an SNMP query to obtain data for the rip2IfStatStatus object for all of the interfaces in the RIP interface status table using the snmpwalk command.

    $ snmpwalk -m all -v2c 10.0.0.253 -c T8vCx3 rip2IfStatStatus
    RIPv2-MIB::rip2IfStatStatus.10.0.0.253 = INTEGER: active(1)
    RIPv2-MIB::rip2IfStatStatus.172.16.1.1 = INTEGER: active(1)
    RIPv2-MIB::rip2IfStatStatus.172.16.2.1 = INTEGER: active(1)
    RIPv2-MIB::rip2IfStatStatus.172.17.1.1 = INTEGER: active(1)
    RIPv2-MIB::rip2IfStatStatus.172.17.2.1 = INTEGER: active(1)
    $ 
    

    The following example shows how to send an SNMP query to obtain data for the rip2IfStatStatus object for a specific interface IP address in the RIP interface status table using the snmpget command.

    $ snmpget -m all -v2c 10.0.0.253 -c T8vCx3 rip2IfStatStatus.10.0.0.253
    RIPv2-MIB::rip2IfStatStatus.10.0.0.253 = INTEGER: active(1)
    $

    Querying the RIP Interface Configuration Table Objects Example

    The following example shows how to send an SNMP query to obtain data for all objects in the RIP interface configuration table using the snmpwalk command.

    $ snmpwalk -m all -v2c 10.0.0.253 -c T8vCx3 rip2IfConfEntry
    RIPv2-MIB::rip2IfConfAddress.10.0.0.253 = IpAddress: 10.0.0.253
    RIPv2-MIB::rip2IfConfAddress.172.16.1.1 = IpAddress: 172.16.1.1
    RIPv2-MIB::rip2IfConfAddress.172.16.2.1 = IpAddress: 172.16.2.1
    RIPv2-MIB::rip2IfConfAddress.172.17.1.1 = IpAddress: 172.17.1.1
    RIPv2-MIB::rip2IfConfAddress.172.17.2.1 = IpAddress: 172.17.2.1
    RIPv2-MIB::rip2IfConfDomain.10.0.0.253 = ""
    RIPv2-MIB::rip2IfConfDomain.172.16.1.1 = ""
    RIPv2-MIB::rip2IfConfDomain.172.16.2.1 = ""
    RIPv2-MIB::rip2IfConfDomain.172.17.1.1 = ""
    RIPv2-MIB::rip2IfConfDomain.172.17.2.1 = ""
    RIPv2-MIB::rip2IfConfAuthType.10.0.0.253 = INTEGER: noAuthentication(1)
    RIPv2-MIB::rip2IfConfAuthType.172.16.1.1 = INTEGER: noAuthentication(1)
    RIPv2-MIB::rip2IfConfAuthType.172.16.2.1 = INTEGER: noAuthentication(1)
    RIPv2-MIB::rip2IfConfAuthType.172.17.1.1 = INTEGER: noAuthentication(1)
    RIPv2-MIB::rip2IfConfAuthType.172.17.2.1 = INTEGER: noAuthentication(1)
    RIPv2-MIB::rip2IfConfAuthKey.10.0.0.253 = ""
    RIPv2-MIB::rip2IfConfAuthKey.172.16.1.1 = ""
    RIPv2-MIB::rip2IfConfAuthKey.172.16.2.1 = ""
    RIPv2-MIB::rip2IfConfAuthKey.172.17.1.1 = ""
    RIPv2-MIB::rip2IfConfAuthKey.172.17.2.1 = ""
    RIPv2-MIB::rip2IfConfSend.10.0.0.253 = INTEGER: ripVersion2(4)
    RIPv2-MIB::rip2IfConfSend.172.16.1.1 = INTEGER: ripVersion2(4)
    RIPv2-MIB::rip2IfConfSend.172.16.2.1 = INTEGER: ripVersion2(4)
    RIPv2-MIB::rip2IfConfSend.172.17.1.1 = INTEGER: ripVersion2(4)
    RIPv2-MIB::rip2IfConfSend.172.17.2.1 = INTEGER: ripVersion2(4)
    RIPv2-MIB::rip2IfConfReceive.10.0.0.253 = INTEGER: rip2(2)
    RIPv2-MIB::rip2IfConfReceive.172.16.1.1 = INTEGER: rip2(2)
    RIPv2-MIB::rip2IfConfReceive.172.16.2.1 = INTEGER: rip2(2)
    RIPv2-MIB::rip2IfConfReceive.172.17.1.1 = INTEGER: rip2(2)
    RIPv2-MIB::rip2IfConfReceive.172.17.2.1 = INTEGER: rip2(2)
    RIPv2-MIB::rip2IfConfDefaultMetric.10.0.0.253 = INTEGER: 1
    RIPv2-MIB::rip2IfConfDefaultMetric.172.16.1.1 = INTEGER: 1
    RIPv2-MIB::rip2IfConfDefaultMetric.172.16.2.1 = INTEGER: 1
    RIPv2-MIB::rip2IfConfDefaultMetric.172.17.1.1 = INTEGER: 1
    RIPv2-MIB::rip2IfConfDefaultMetric.172.17.2.1 = INTEGER: 1
    RIPv2-MIB::rip2IfConfStatus.10.0.0.253 = INTEGER: active(1)
    RIPv2-MIB::rip2IfConfStatus.172.16.1.1 = INTEGER: active(1)
    RIPv2-MIB::rip2IfConfStatus.172.16.2.1 = INTEGER: active(1)
    RIPv2-MIB::rip2IfConfStatus.172.17.1.1 = INTEGER: active(1)
    RIPv2-MIB::rip2IfConfStatus.172.17.2.1 = INTEGER: active(1)
    RIPv2-MIB::rip2IfConfSrcAddress.10.0.0.253 = IpAddress: 10.0.0.253
    RIPv2-MIB::rip2IfConfSrcAddress.172.16.1.1 = IpAddress: 172.16.1.1
    RIPv2-MIB::rip2IfConfSrcAddress.172.16.2.1 = IpAddress: 172.16.2.1
    RIPv2-MIB::rip2IfConfSrcAddress.172.17.1.1 = IpAddress: 172.17.1.1
    RIPv2-MIB::rip2IfConfSrcAddress.172.17.2.1 = IpAddress: 172.17.2.1
    $
    

    The following example shows how to send an SNMP query to obtain data for the rip2IfConfAddress object for all interfaces in the RIP interface configuration table using the snmpwalk command.

    $ snmpwalk -m all -v2c 10.0.0.253 -c T8vCx3 rip2IfConfAddress
    RIPv2-MIB::rip2IfConfAddress.10.0.0.253 = IpAddress: 10.0.0.253
    RIPv2-MIB::rip2IfConfAddress.172.16.1.1 = IpAddress: 172.16.1.1
    RIPv2-MIB::rip2IfConfAddress.172.16.2.1 = IpAddress: 172.16.2.1
    RIPv2-MIB::rip2IfConfAddress.172.17.1.1 = IpAddress: 172.17.1.1
    RIPv2-MIB::rip2IfConfAddress.172.17.2.1 = IpAddress: 172.17.2.1
    $

    Where to Go Next

    For more information about SNMP and SNMP operations, see the "Configuring SNMP Support" chapter of the Cisco IOS XE Network Management Configuration Guide, Release 2 .

    Additional References

    The following sections provide references related to RIPv2 Monitoring with SNMP Using the RFC 1724 MIB Extensions.

    Related Documents

    Related Topic

    Document Title

    RIP configuration

    "Configuring Routing Information Protocol"

    RIP commands

    Cisco IOS IP Routing: RIPCommand Reference

    SNMP configuration

    "Configuring SNMP Support"

    SNMP commands

    Cisco IOS Network Management Command Reference

    Standards

    Standard

    Title

    No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.

    --

    MIBs

    MIB

    MIBs Link

    RIPv2 MIB

    To locate and download MIBs for selected platforms, Cisco IOS XE software releases, and feature sets, use Cisco MIB Locator found at the following URL:

    http://www.cisco.com/go/mibs

    RFCs

    RFC

    Title

    RFC 1724

    RIP Version 2 MIB Extensions

    Technical Assistance

    Description

    Link

    The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

    To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

    Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

    http://www.cisco.com/techsupport

    Feature Information for RIPv2 Monitoring with SNMP Using the RFC 1724 MIB Extensions

    The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

    Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

    Table 4 Feature Information for RIPv2: RFC 1724 MIB Extensions

    Feature Name

    Releases

    Feature Information

    RIPv2: RFC 1724 MIB Extension

    Cisco IOS XE Release 2.1

    This feature introduces the Cisco IOS XE implementation of RFC 1724, RIP Version 2 MIB Extensions . RFC 1724 defines MIB objects that allow the management and limited control of RIPv2 using SNMP.

    In Cisco IOS XE Release 2.1, this feature was introduced on the Cisco ASR 1000 Series Aggregation Services Routers.

    Glossary

    OID --object identifier, A managed object within the object tree.

    SNMP --Simple Network Management Protocol, a protocol used to monitor and manage networking devices.

    snmpwalk --An SNMP command to query statistics from a branch in the MIB.

    snmpget --An SNMP command to query statistics from a specific OID in the MIB.