Contents

Advanced RIP Features

The Advanced RIP Features contained in this configuration module cover the implementation of RFC 1724, which allows you to monitor RIPv2 using SNMP, and the information about configuring the cable modem HFC RIP Relay feature.

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.

Information About Advanced RIP Features

Cable HFC

Cable technology has been adapting to the deployment of fiber since 1994, leading to hybrid solutions known as hybrid fiber-coaxial (HFC). HFC networks contain both optical-fiber and coaxial cable lines. Optical fiber is deployed from the cable headend to cable operator subscribers with up to 2000 subscribers. Coaxial cable is deployed from the optical-fiber feeders to each subscriber. Hybrid networks provide the bandwidth and reliability of optical fiber at a lower cost than a pure fiber network.

HFC RIP Relay

The cable modem HFC RIP Relay feature allows the delivery of Routing Information Protocol (RIP) messages from a Cisco IOS router containing an integrated cable modem to the hybrid fiber-coaxial (HFC) cable modem termination system (CMTS) when they are on different subnets. The integrated cable modem may be physically integrated into the router or via a cable modem high-speed WAN interface card (HWIC). In previous Cisco IOS releases, RIP messages were rejected by the CMTS because the interface on the Cisco IOS router was in a different subnet from the CMTS. The solution involves trapping and handling RIP messages by the cable modem and ensuring that the RIP messages are forwarded to the router. The cable modem HFC RIP Relay feature enhances the scalability, security, and certification requirements of cable operators who require RIP to provision and manage customer cable modems.

In the provisioning systems used by some cable operators, when a Cisco IOS router containing an integrated cable modem is connected to a CMTS, RIP messages are rejected because the IP address derived from a DHCP request for the router is from a different pool of IP addresses than for the cable modems. The RIP messages are rejected by the CMTS because the interface on the Cisco IOS router is in a different subnet from the CMTS. Without requiring additional configuration on the CMTS, the HFC RIP Relay feature enables the cable modem to bridge the RIP messages between the Cisco IOS router and the CMTS.

The cable modem HFC RIP Relay feature is implemented in Cisco IOS Release 12.4(15)XY, 12.4(20)T, and later releases. The feature requires the cable modem firmware version filename of C21031014bFU07192007.CDF in the United States or the cable modem firmware version filename of C21041014bFU07192007.CDF in Europe and Japan, and the feature is turned off by default. To enable HFC RIP relay, use the new service-module ip rip relay command-line interface (CLI) command.

Support is added for configuring a static IP address on the cable modem interface. Configuring a static IP address for the Cisco IOS router with an integrated cable modem is also supported in Cisco IOS Release 12.4(15)XY, 12.4(20)T, and later releases using the ip address command.

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.

RIPv2 MIB

This document describes the Cisco IOS implementation of RFC 1724, RIP Version 2 MIB Extensions . RIPv2 using Simple Network Management Protocol (SNMP).

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 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 Network Management Station (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. The number is incremented when a route is modified.

rip2GlobalQueries

Number of responses sent to RIP queries from other systems. The 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 objects 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.

  • A RIP v2 update is received and the address is not a RIP multicast address (244.0.0.0) or RIP broadcast address (255.255.255.255).

  • 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 using 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.

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.


Timesaver

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 Release 12.4(6)T 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 Configure Advanced RIP Features

Configuring HFC RIP Relay

This section contains the following tasks:

Prerequisites

The HFC RIP Relay feature requires an Integrated Services Router (ISR) with an integrated cable modem and Cisco IOS Release 12.4(15)XY, 12.4(20)T, or later release and one of the following:

  • Cable modem firmware version filename of C21031014bFU07192007.CDF in the United States

  • Cable modem firmware version filename of C21041014bFU07192007.CDF in Europe and Japan

ISR cable products include the Cisco 815, Cisco 1805, and the cable modem HWIC in the Cisco 1800, 2800, and 3800 series routers.

Restrictions

The HFC RIP Relay feature does not support multiple cable modem HWICs in a single router.

Enabling HFC RIP Relay

Perform this task to enable RIP relay on an integrated cable modem. In this task, a static IP address is configured for the cable modem interface and RIP relay is enabled on the interface. Validation of the source IP address of incoming RIP routing updates is disabled to allow RIP updates from unknown sources. RIP is defined as the routing protocol to be used on all interfaces that are connected to networks 10.0.0.0 and 172.18.0.0.

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    interface type number

    4.    ip address ip-address mask [secondary]

    5.    service-module ip rip relay

    6.    exit

    7.    router rip

    8.    version {1 | 2}

    9.    no validate-update-source

    10.    network ip-address

    11.    end


DETAILED STEPS
     Command or ActionPurpose
    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 interface type number


    Example:
    Router(config)# interface cable-modem 0/3/0
     

    Configures an interface type and enters interface configuration mode.

    • In this example, cable-modem interface 0/3/0 is configured.

     
    Step 4 ip address ip-address mask [secondary]


    Example:
    Router(config-if)# ip address 10.5.5.5 255.255.255.0
     

    Sets a primary or secondary IP address for an interface.

    • In this example, the static IP address of 10.5.5.5 is configured under the cable-modem interface.

     
    Step 5 service-module ip rip relay


    Example:
    Router(config-if)# service-module ip rip relay
     

    Enables RIP relay in the ISR cable-modem driver.

     
    Step 6 exit


    Example:
    Router(config-if)# exit
     

    Exits interface configuration mode and returns to global configuration mode.

     
    Step 7 router rip


    Example:
    Router(config)# router rip
     

    Enters router configuration mode for the specified routing process.

    • In this example, a RIP routing process is configured.

     
    Step 8 version {1 | 2}


    Example:
    Router(config-router)# version 2
     

    Specifies a RIP version used globally by the router.

    • In this example, the software sends and receives RIP version 2 packets.

     
    Step 9 no validate-update-source


    Example:
    Router(config-router)# no validate-update-source
     

    Disables the validation of the source IP address of incoming RIP routing updates.

    • When the validation check is enabled, the software ensures that the source IP address of incoming routing updates is on the same IP network as one of the addresses defined for the receiving interface.

    • In this example, the router is configured not to perform validation checks on the source IP address of incoming RIP updates.

     
    Step 10 network ip-address


    Example:
    Router(config-router)# network 10.0.0.0
     

    Specifies a list of networks for the RIP routing process.

    • In this example, RIP is defined as the routing protocol to be used on all interfaces connected to network 10.0.0.0.

     
    Step 11 end


    Example:
    Router(config-router)# end
     

    Exits router configuration mode and returns to privileged EXEC mode.

     

    Enabling HFC RIP Relay for a Single Subnet and Disabling Split-Horizon

    Perform this task to enable RIP relay on an ISR cable modem. In this task, a static IP address is configured for the cable-modem interface and RIP relay is enabled on the interface. Split-horizon is disabled, and RIP is defined as the routing protocol to be used on all interfaces connected to network 10.0.0.0.

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    interface type number

      4.    ip address ip-address mask [secondary]

      5.    service-module ip rip relay

      6.    no ip split-horizon

      7.    exit

      8.    router rip

      9.    version {1 | 2}

      10.    no validate-update-source

      11.    network ip-address

      12.    end


    DETAILED STEPS
       Command or ActionPurpose
      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 interface type number


      Example:
      Router(config)# interface cable-modem 0/3/0
       

      Configures an interface type and enters interface configuration mode.

      • In this example, cable-modem interface 0/3/0 is configured.

       
      Step 4 ip address ip-address mask [secondary]


      Example:
      Router(config-if)# ip address 10.5.5.5 255.255.255.0
       

      Sets a primary or secondary IP address for an interface.

      • In this example, a static IP address of 10.5.5.5 is configured under the cable-modem interface.

       
      Step 5 service-module ip rip relay


      Example:
      Router(config-if)# service-module ip rip relay
       

      Enables RIP relay in the ISR cable-modem driver.

       
      Step 6 no ip split-horizon


      Example:
      Router(config-if)# no ip split-horizon
       

      Disables split horizon, allowing routing updates to be sent from the interface over which the route was learned.

       
      Step 7 exit


      Example:
      Router(config-if)# exit
       

      Exits interface configuration mode and returns to global configuration mode.

       
      Step 8 router rip


      Example:
      Router(config)# router rip
       

      Enters router configuration mode for the specified routing process.

      • In this example, a RIP routing process is configured.

       
      Step 9 version {1 | 2}


      Example:
      Router(config-router)# version 2
       

      Specifies a RIP version used globally by the router.

      • In this example, the software sends and receives RIP version 2 packets.

       
      Step 10 no validate-update-source


      Example:
      Router(config-router)# no validate-update-source
       

      Disables the validation of the source IP address of incoming RIP routing updates.

      • When the validation check is enabled, the software ensures that the source IP address of incoming routing updates is on the same IP network as one of the addresses defined for the receiving interface.

      • In this example, the router is configured not to perform validation checks on the source IP address of incoming RIP updates.

       
      Step 11 network ip-address


      Example:
      Router(config-router)# network 10.0.0.0
       

      Specifies a list of networks for the RIP routing process.

      • In this example, RIP is defined as the routing protocol to be used on all interfaces connected to network 10.0.0.0.

       
      Step 12 end


      Example:
      Router(config-router)# end
       

      Exits router configuration mode and returns to privileged EXEC mode.

       

      Verifying the Configuration of HFC RIP Relay

      Use the following steps to verify the local configuration of HFC RIP relay on a router.

      SUMMARY STEPS

        1.    enable

        2.    show running-config [options]


      DETAILED STEPS
        Step 1   enable

        Enables privileged EXEC mode. Enter your password if prompted.



        Example:
        Router> enable
        Step 2   show running-config [options]

        Displays the running configuration on the local router. The output will display the configuration of the service-module ip rip relay command in the cable-modem interface section and of the RIP commands under the RIP protocol section.



        Example:
        Router# show running-config
.
.
.
interface Cable-Modem0/3/0
 ip address 172.20.0.2 255.255.255.0
 service-module ip rip relay
 no ip split-horizon
.
.
.
router rip
 version 2
 no validate-update-source            
 network 10.0.0.0
 network 172.18.0.0
.
.
.

        Enabling RIPv2 Monitoring with SNMP Using the RIPv2 RFC 1724 MIB Extensions

        This section contains the following tasks:

        Prerequisites

        • RIPv2 must be configured on the router.

        • Your SNMP 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

        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.

        Enabling SNMP Read-Only Access on the Router

        There are no router configuration tasks required for the RIPv2: 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.


        Note

        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 software 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 ActionPurpose
          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 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 RFC 1724 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 Advanced RIP Features

          Configuration Examples for HFC RIP Relay

          This section contains the following examples:

          Enabling HFC RIP Relay Example

          The following example enables RIP relay on an ISR cable modem. A static IP address is configured for the cable-modem interface, and RIP relay is enabled on the interface. Validation of the source IP address of incoming RIP routing updates is disabled to allow RIP updates from unknown sources. RIP is defined as the routing protocol to be used on all interfaces connected to networks 10.0.0.0 and 172.18.0.0.

          interface Cable-Modem0/3/0
 ip address 10.5.5.5 255.255.255.0
 service-module ip rip relay
 exit 
router rip
 version 2
 no validate-update-source
 network 10.0.0.0
 network 172.18.0.0

          Enabling HFC RIP Relay for a Single Subnet and Disabling Split-Horizon Example

          The following example enables RIP relay on an ISR cable modem. A static IP address is configured for the cable-modem interface, and RIP relay is enabled on the interface. Validation of the source IP address of incoming RIP routing updates is disabled to allow RIP updates from unknown sources, and split-horizon is disabled. RIP is defined as the routing protocol to be used on all interfaces connected to network 172.20.0.0.

          interface Cable-Modem0/3/0
 ip address 172.20.0.2 255.255.255.0
 service-module ip rip relay
 no ip split-horizon
 exit 
router rip
 version 2
 no validate-update-source

          network 172.20.0.0

          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 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
$

          Additional References

          The following sections provide references related to advanced RIP configuration.

          Related Documents

          Related Topic

          Document Title

          Configuring RIP

          "Configuring Routing Information Protocol"

          Configuring protocol-independent routing features

          "Configuring IP Routing Protocol-Independent Features"

          Configuring Frame Relay

          " Configuring Frame Relay"

          Cable modem HWIC card configuration

          Cisco Cable Modem High-Speed WAN Interface Cards Configuration Guide

          RIP commands: complete command syntax, command mode, defaults, command history, usage guidelines, and examples

          Cisco IOS IP Routing: RIP Command Reference

          SNMP configuration

          "Configuring SNMP Support"

          SNMP commands

          Cisco IOS Network Management Command Reference

          Standards

          Standard

          Title

          No new or modified standards are supported. and support for existing standards has not been modified.

          --

          MIBs

          MIB

          MIBs Link

          RIPv2 MIB

          To locate and download MIBs for selected platforms, Cisco IOS 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

          RFC 2082

          RIP-2 MD5 Authentication

          RFC 2453

          RIP Version 2

          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 Advanced RIP Features

          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 Advanced RIP Features

          Feature Name

          Releases

          Feature Information

          HFC RIP Relay

          12.4(15)XY 12.4(20)T 15.0(1)M 12.2(33)SRE

          The HFC RIP Relay feature allows the delivery of Routing Information Protocol (RIP) messages from a Cisco IOS router containing a cable HWIC to the HFC CMTS when they are on different subnets. Configuring a static IP address is now also supported on a cable modem interface.

          The following command was introduced by this feature: service-module ip rip relay.

          RIPv2: RFC 1724 MIB Extension

          12.4(6)T 15.0(1)M 12.2(33)SRE

          This feature introduces the Cisco IOS 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.

          Glossary

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

          SNMP--Simple Network Management Protocol. Aprotocol used to monitor and manage networking devices.

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

          Advanced RIP Features

          Contents

          Advanced RIP Features

          The Advanced RIP Features contained in this configuration module cover the implementation of RFC 1724, which allows you to monitor RIPv2 using SNMP, and the information about configuring the cable modem HFC RIP Relay feature.

          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.

          Information About Advanced RIP Features

          Cable HFC

          Cable technology has been adapting to the deployment of fiber since 1994, leading to hybrid solutions known as hybrid fiber-coaxial (HFC). HFC networks contain both optical-fiber and coaxial cable lines. Optical fiber is deployed from the cable headend to cable operator subscribers with up to 2000 subscribers. Coaxial cable is deployed from the optical-fiber feeders to each subscriber. Hybrid networks provide the bandwidth and reliability of optical fiber at a lower cost than a pure fiber network.

          HFC RIP Relay

          The cable modem HFC RIP Relay feature allows the delivery of Routing Information Protocol (RIP) messages from a Cisco IOS router containing an integrated cable modem to the hybrid fiber-coaxial (HFC) cable modem termination system (CMTS) when they are on different subnets. The integrated cable modem may be physically integrated into the router or via a cable modem high-speed WAN interface card (HWIC). In previous Cisco IOS releases, RIP messages were rejected by the CMTS because the interface on the Cisco IOS router was in a different subnet from the CMTS. The solution involves trapping and handling RIP messages by the cable modem and ensuring that the RIP messages are forwarded to the router. The cable modem HFC RIP Relay feature enhances the scalability, security, and certification requirements of cable operators who require RIP to provision and manage customer cable modems.

          In the provisioning systems used by some cable operators, when a Cisco IOS router containing an integrated cable modem is connected to a CMTS, RIP messages are rejected because the IP address derived from a DHCP request for the router is from a different pool of IP addresses than for the cable modems. The RIP messages are rejected by the CMTS because the interface on the Cisco IOS router is in a different subnet from the CMTS. Without requiring additional configuration on the CMTS, the HFC RIP Relay feature enables the cable modem to bridge the RIP messages between the Cisco IOS router and the CMTS.

          The cable modem HFC RIP Relay feature is implemented in Cisco IOS Release 12.4(15)XY, 12.4(20)T, and later releases. The feature requires the cable modem firmware version filename of C21031014bFU07192007.CDF in the United States or the cable modem firmware version filename of C21041014bFU07192007.CDF in Europe and Japan, and the feature is turned off by default. To enable HFC RIP relay, use the new service-module ip rip relay command-line interface (CLI) command.

          Support is added for configuring a static IP address on the cable modem interface. Configuring a static IP address for the Cisco IOS router with an integrated cable modem is also supported in Cisco IOS Release 12.4(15)XY, 12.4(20)T, and later releases using the ip address command.

          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.

          RIPv2 MIB

          This document describes the Cisco IOS implementation of RFC 1724, RIP Version 2 MIB Extensions . RIPv2 using Simple Network Management Protocol (SNMP).

          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 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 Network Management Station (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. The number is incremented when a route is modified.

          rip2GlobalQueries

          Number of responses sent to RIP queries from other systems. The 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 objects 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.

          • A RIP v2 update is received and the address is not a RIP multicast address (244.0.0.0) or RIP broadcast address (255.255.255.255).

          • 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 using 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.

          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.


          Timesaver

          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 Release 12.4(6)T 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 Configure Advanced RIP Features

          Configuring HFC RIP Relay

          This section contains the following tasks:

          Prerequisites

          The HFC RIP Relay feature requires an Integrated Services Router (ISR) with an integrated cable modem and Cisco IOS Release 12.4(15)XY, 12.4(20)T, or later release and one of the following:

          • Cable modem firmware version filename of C21031014bFU07192007.CDF in the United States

          • Cable modem firmware version filename of C21041014bFU07192007.CDF in Europe and Japan

          ISR cable products include the Cisco 815, Cisco 1805, and the cable modem HWIC in the Cisco 1800, 2800, and 3800 series routers.

          Restrictions

          The HFC RIP Relay feature does not support multiple cable modem HWICs in a single router.

          Enabling HFC RIP Relay

          Perform this task to enable RIP relay on an integrated cable modem. In this task, a static IP address is configured for the cable modem interface and RIP relay is enabled on the interface. Validation of the source IP address of incoming RIP routing updates is disabled to allow RIP updates from unknown sources. RIP is defined as the routing protocol to be used on all interfaces that are connected to networks 10.0.0.0 and 172.18.0.0.

          SUMMARY STEPS

            1.    enable

            2.    configure terminal

            3.    interface type number

            4.    ip address ip-address mask [secondary]

            5.    service-module ip rip relay

            6.    exit

            7.    router rip

            8.    version {1 | 2}

            9.    no validate-update-source

            10.    network ip-address

            11.    end


          DETAILED STEPS
             Command or ActionPurpose
            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 interface type number


            Example:
            Router(config)# interface cable-modem 0/3/0
             

            Configures an interface type and enters interface configuration mode.

            • In this example, cable-modem interface 0/3/0 is configured.

             
            Step 4 ip address ip-address mask [secondary]


            Example:
            Router(config-if)# ip address 10.5.5.5 255.255.255.0
             

            Sets a primary or secondary IP address for an interface.

            • In this example, the static IP address of 10.5.5.5 is configured under the cable-modem interface.

             
            Step 5 service-module ip rip relay


            Example:
            Router(config-if)# service-module ip rip relay
             

            Enables RIP relay in the ISR cable-modem driver.

             
            Step 6 exit


            Example:
            Router(config-if)# exit
             

            Exits interface configuration mode and returns to global configuration mode.

             
            Step 7 router rip


            Example:
            Router(config)# router rip
             

            Enters router configuration mode for the specified routing process.

            • In this example, a RIP routing process is configured.

             
            Step 8 version {1 | 2}


            Example:
            Router(config-router)# version 2
             

            Specifies a RIP version used globally by the router.

            • In this example, the software sends and receives RIP version 2 packets.

             
            Step 9 no validate-update-source


            Example:
            Router(config-router)# no validate-update-source
             

            Disables the validation of the source IP address of incoming RIP routing updates.

            • When the validation check is enabled, the software ensures that the source IP address of incoming routing updates is on the same IP network as one of the addresses defined for the receiving interface.

            • In this example, the router is configured not to perform validation checks on the source IP address of incoming RIP updates.

             
            Step 10 network ip-address


            Example:
            Router(config-router)# network 10.0.0.0
             

            Specifies a list of networks for the RIP routing process.

            • In this example, RIP is defined as the routing protocol to be used on all interfaces connected to network 10.0.0.0.

             
            Step 11 end


            Example:
            Router(config-router)# end
             

            Exits router configuration mode and returns to privileged EXEC mode.

             

            Enabling HFC RIP Relay for a Single Subnet and Disabling Split-Horizon

            Perform this task to enable RIP relay on an ISR cable modem. In this task, a static IP address is configured for the cable-modem interface and RIP relay is enabled on the interface. Split-horizon is disabled, and RIP is defined as the routing protocol to be used on all interfaces connected to network 10.0.0.0.

            SUMMARY STEPS

              1.    enable

              2.    configure terminal

              3.    interface type number

              4.    ip address ip-address mask [secondary]

              5.    service-module ip rip relay

              6.    no ip split-horizon

              7.    exit

              8.    router rip

              9.    version {1 | 2}

              10.    no validate-update-source

              11.    network ip-address

              12.    end


            DETAILED STEPS
               Command or ActionPurpose
              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 interface type number


              Example:
              Router(config)# interface cable-modem 0/3/0
               

              Configures an interface type and enters interface configuration mode.

              • In this example, cable-modem interface 0/3/0 is configured.

               
              Step 4 ip address ip-address mask [secondary]


              Example:
              Router(config-if)# ip address 10.5.5.5 255.255.255.0
               

              Sets a primary or secondary IP address for an interface.

              • In this example, a static IP address of 10.5.5.5 is configured under the cable-modem interface.

               
              Step 5 service-module ip rip relay


              Example:
              Router(config-if)# service-module ip rip relay
               

              Enables RIP relay in the ISR cable-modem driver.

               
              Step 6 no ip split-horizon


              Example:
              Router(config-if)# no ip split-horizon
               

              Disables split horizon, allowing routing updates to be sent from the interface over which the route was learned.

               
              Step 7 exit


              Example:
              Router(config-if)# exit
               

              Exits interface configuration mode and returns to global configuration mode.

               
              Step 8 router rip


              Example:
              Router(config)# router rip
               

              Enters router configuration mode for the specified routing process.

              • In this example, a RIP routing process is configured.

               
              Step 9 version {1 | 2}


              Example:
              Router(config-router)# version 2
               

              Specifies a RIP version used globally by the router.

              • In this example, the software sends and receives RIP version 2 packets.

               
              Step 10 no validate-update-source


              Example:
              Router(config-router)# no validate-update-source
               

              Disables the validation of the source IP address of incoming RIP routing updates.

              • When the validation check is enabled, the software ensures that the source IP address of incoming routing updates is on the same IP network as one of the addresses defined for the receiving interface.

              • In this example, the router is configured not to perform validation checks on the source IP address of incoming RIP updates.

               
              Step 11 network ip-address


              Example:
              Router(config-router)# network 10.0.0.0
               

              Specifies a list of networks for the RIP routing process.

              • In this example, RIP is defined as the routing protocol to be used on all interfaces connected to network 10.0.0.0.

               
              Step 12 end


              Example:
              Router(config-router)# end
               

              Exits router configuration mode and returns to privileged EXEC mode.

               

              Verifying the Configuration of HFC RIP Relay

              Use the following steps to verify the local configuration of HFC RIP relay on a router.

              SUMMARY STEPS

                1.    enable

                2.    show running-config [options]


              DETAILED STEPS
                Step 1   enable

                Enables privileged EXEC mode. Enter your password if prompted.



                Example:
                Router> enable
                Step 2   show running-config [options]

                Displays the running configuration on the local router. The output will display the configuration of the service-module ip rip relay command in the cable-modem interface section and of the RIP commands under the RIP protocol section.



                Example:
                Router# show running-config
.
.
.
interface Cable-Modem0/3/0
 ip address 172.20.0.2 255.255.255.0
 service-module ip rip relay
 no ip split-horizon
.
.
.
router rip
 version 2
 no validate-update-source            
 network 10.0.0.0
 network 172.18.0.0
.
.
.

                Enabling RIPv2 Monitoring with SNMP Using the RIPv2 RFC 1724 MIB Extensions

                This section contains the following tasks:

                Prerequisites

                • RIPv2 must be configured on the router.

                • Your SNMP 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

                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.

                Enabling SNMP Read-Only Access on the Router

                There are no router configuration tasks required for the RIPv2: 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.


                Note

                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 software 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 ActionPurpose
                  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 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 RFC 1724 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 Advanced RIP Features

                  Configuration Examples for HFC RIP Relay

                  This section contains the following examples:

                  Enabling HFC RIP Relay Example

                  The following example enables RIP relay on an ISR cable modem. A static IP address is configured for the cable-modem interface, and RIP relay is enabled on the interface. Validation of the source IP address of incoming RIP routing updates is disabled to allow RIP updates from unknown sources. RIP is defined as the routing protocol to be used on all interfaces connected to networks 10.0.0.0 and 172.18.0.0.

                  interface Cable-Modem0/3/0
 ip address 10.5.5.5 255.255.255.0
 service-module ip rip relay
 exit 
router rip
 version 2
 no validate-update-source
 network 10.0.0.0
 network 172.18.0.0

                  Enabling HFC RIP Relay for a Single Subnet and Disabling Split-Horizon Example

                  The following example enables RIP relay on an ISR cable modem. A static IP address is configured for the cable-modem interface, and RIP relay is enabled on the interface. Validation of the source IP address of incoming RIP routing updates is disabled to allow RIP updates from unknown sources, and split-horizon is disabled. RIP is defined as the routing protocol to be used on all interfaces connected to network 172.20.0.0.

                  interface Cable-Modem0/3/0
 ip address 172.20.0.2 255.255.255.0
 service-module ip rip relay
 no ip split-horizon
 exit 
router rip
 version 2
 no validate-update-source

                  network 172.20.0.0

                  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 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
$

                  Additional References

                  The following sections provide references related to advanced RIP configuration.

                  Related Documents

                  Related Topic

                  Document Title

                  Configuring RIP

                  "Configuring Routing Information Protocol"

                  Configuring protocol-independent routing features

                  "Configuring IP Routing Protocol-Independent Features"

                  Configuring Frame Relay

                  " Configuring Frame Relay"

                  Cable modem HWIC card configuration

                  Cisco Cable Modem High-Speed WAN Interface Cards Configuration Guide

                  RIP commands: complete command syntax, command mode, defaults, command history, usage guidelines, and examples

                  Cisco IOS IP Routing: RIP Command Reference

                  SNMP configuration

                  "Configuring SNMP Support"

                  SNMP commands

                  Cisco IOS Network Management Command Reference

                  Standards

                  Standard

                  Title

                  No new or modified standards are supported. and support for existing standards has not been modified.

                  --

                  MIBs

                  MIB

                  MIBs Link

                  RIPv2 MIB

                  To locate and download MIBs for selected platforms, Cisco IOS 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

                  RFC 2082

                  RIP-2 MD5 Authentication

                  RFC 2453

                  RIP Version 2

                  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 Advanced RIP Features

                  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 Advanced RIP Features

                  Feature Name

                  Releases

                  Feature Information

                  HFC RIP Relay

                  12.4(15)XY 12.4(20)T 15.0(1)M 12.2(33)SRE

                  The HFC RIP Relay feature allows the delivery of Routing Information Protocol (RIP) messages from a Cisco IOS router containing a cable HWIC to the HFC CMTS when they are on different subnets. Configuring a static IP address is now also supported on a cable modem interface.

                  The following command was introduced by this feature: service-module ip rip relay.

                  RIPv2: RFC 1724 MIB Extension

                  12.4(6)T 15.0(1)M 12.2(33)SRE

                  This feature introduces the Cisco IOS 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.

                  Glossary

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

                  SNMP--Simple Network Management Protocol. Aprotocol used to monitor and manage networking devices.

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