IP Routing: ISIS Configuration Guide, Cisco IOS XE Release 3E
IPv6 Routing: Route Redistribution
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IPv6 Routing: Route Redistribution

IPv6 Routing: Route Redistribution

IPv6 route redistribution supports redistributing routes into an IPv6 IS-IS routing process and redistributing IPv6 IS-IS routes between IS-IS levels.

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 IPv6 Routing: Route Redistribution

IS-IS Enhancements for IPv6

IS-IS in IPv6 functions the same and offers many of the same benefits as IS-IS in IPv4. IPv6 enhancements to IS-IS allow IS-IS to advertise IPv6 prefixes in addition to IPv4 and OSI routes. Extensions to the IS-IS command-line interface (CLI) allow configuration of IPv6-specific parameters. IPv6 IS-IS extends the address families supported by IS-IS to include IPv6, in addition to OSI and IPv4.

IS-IS in IPv6 supports either single-topology mode or multiple topology mode.

IPv6 IS-IS Route Redistribution

IS-IS for IPv6 supports redistributing routes into an IPv6 IS-IS routing process and redistributing IPv6 IS-IS routes between IS-IS levels.

How to Configure IPv6 Routing: Route Redistribution

Redistributing Routes into an IPv6 IS-IS Routing Process

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    router isis area-tag

    4.    address-family ipv6 [unicast | multicast]

    5.    redistribute source-protocol process-id ] [include-connected] [target-protocol-options] [source-protocol-options]


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 router isis area-tag


    Example:
    Router(config)# router isis area2
     

    Enables IS-IS for the specified IS-IS routing process, and enters router configuration mode.

     
    Step 4 address-family ipv6 [unicast | multicast]


    Example:
    Router(config-router)# address-family ipv6
     

    Specifies the IPv6 address family, and enters address family configuration mode.

    • The unicast keyword specifies the unicast IPv6 unicast address family. By default, the router is placed in configuration mode for the unicast IPv6 address family if the unicast keyword is not specified with the address-family ipv6 command.
     
    Step 5 redistribute source-protocol process-id ] [include-connected] [target-protocol-options] [source-protocol-options]


    Example:
    Router(config-router-af)# redistribute bgp 64500 metric 100 route-map isismap
     

    Redistributes routes from the specified protocol into the IS-IS process.

    • The source-protocol argument can be one of the following keywords: bgp, connected, isis, rip, or static.
    • Only the arguments and keywords relevant to this task are specified here.
     

    Redistributing IPv6 IS-IS Routes Between IS-IS Levels

    Perform this task to redistribute IPv6 routes learned at one IS-IS level into a different level.

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    router isis area-tag

      4.    address-family ipv6 [unicast | multicast]

      5.    redistribute isis [process-id] {level-1 | level-2} into {level-1 | level-2} distribute-list list-name


    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 router isis area-tag


      Example:
      Router(config)# router isis area2
       

      Enables IS-IS for the specified IS-IS routing process, and enters router configuration mode.

       
      Step 4 address-family ipv6 [unicast | multicast]


      Example:
      Router(config-router)# address-family ipv6
       

      Specifies the IPv6 address family, and enters address family configuration mode.

      • The unicast keyword specifies the unicast IPv6 unicast address family. By default, the router is placed in configuration mode for the unicast IPv6 address family if the unicast keyword is not specified with the address-family ipv6 command.
       
      Step 5 redistribute isis [process-id] {level-1 | level-2} into {level-1 | level-2} distribute-list list-name


      Example:
      Router(config-router-af)# redistribute isis level-1 into level-2
       

      Redistributes IPv6 routes from one IS-IS level into another IS-IS level.

      • By default, the routes learned by Level 1 instances are redistributed by the Level 2 instance.
      Note   

      The protocol argument must be isis in this configuration of the redistribute command. Only the arguments and keywords relevant to this task are specified here.

       

      Verifying IPv6 IS-IS Configuration and Operation

      SUMMARY STEPS

        1.    enable

        2.    show ipv6 protocols [summary]

        3.    show isis [process-tag] [ipv6 | *] topology

        4.    show clns [process-tag] neighbors interface-type interface-number] [area] [detail]

        5.    show clns area-tag is-neighbors [type number] [detail]

        6.    show isis [process-tag] database [level-1] [level-2] [l1] [l2] [detail] [lspid]

        7.    show isis ipv6 rib [ipv6-prefix]


      DETAILED STEPS
         Command or ActionPurpose
        Step 1 enable


        Example:
        Device> enable
         

        Enables privileged EXEC mode.

        • Enter your password if prompted.
         
        Step 2 show ipv6 protocols [summary]


        Example:
        Device# show ipv6 protocols
         

        Displays the parameters and current state of the active IPv6 routing processes.

         
        Step 3 show isis [process-tag] [ipv6 | *] topology


        Example:
        Device# show isis topology
         

        Displays a list of all connected routers running IS-IS in all areas.

         
        Step 4 show clns [process-tag] neighbors interface-type interface-number] [area] [detail]


        Example:
        Device# show clns neighbors detail
         

        Displays end system (ES), intermediate system (IS), and multitopology IS-IS (M-ISIS) neighbors.

         
        Step 5 show clns area-tag is-neighbors [type number] [detail]


        Example:
        Device# show clns is-neighbors detail
         

        Displays IS-IS adjacency information for IS-IS neighbors.

        • Use the detail keyword to display the IPv6 link-local addresses of the neighbors.
         
        Step 6 show isis [process-tag] database [level-1] [level-2] [l1] [l2] [detail] [lspid]


        Example:
        Device# show isis database detail
         

        Displays the IS-IS link-state database.

        • In this example, the contents of each LSP are displayed using the detail keyword.
         
        Step 7 show isis ipv6 rib [ipv6-prefix]


        Example:
        Device# show isis ipv6 rib
         

        Displays the IPv6 local RIB.

         

        Configuration Examples for IPv6 Routing: Route Redistribution

        Example: Redistributing Routes into an IPv6 IS-IS Routing Process

        The following example redistributes IPv6 BGP routes into the IPv6 IS-IS Level 2 routing process:

        router isis 
         address-family ipv6
         redistribute bgp 64500 metric 100 route-map isismap
         exit

        Example: Redistributing IPv6 IS-IS Routes Between IS-IS Levels

        The following example redistributes IPv6 IS-IS Level 1 routes into the IPv6 IS-IS Level 2 routing process:

        router isis
         address-family ipv6
         redistribute isis level-1 into level-2

        Example: Configuring IS-IS for IPv6

        In the following example, output information about the parameters and current state of that active IPv6 routing processes is displayed using the show ipv6 protocolscommand:

        Router# show ipv6 protocols
        IPv6 Routing Protocol is "connected"
        IPv6 Routing Protocol is "static"
        IPv6 Routing Protocol is "isis"
          Interfaces:
            GigabitEthernet0/0/3
            GigabitEthernet0/0/1
            Serial1/0/1
            Loopback1 (Passive)
            Loopback2 (Passive)
            Loopback3 (Passive)
            Loopback4 (Passive)
            Loopback5 (Passive)
          Redistribution:
            Redistributing protocol static at level 1
          Address Summarization:
            L2: 2001:DB8:33::/16  advertised with metric 0
            L2: 2001:DB8:44::/16  advertised with metric 20
            L2: 2001:DB8:66::/16  advertised with metric 10
            L2: 2001:DB8:77::/16  advertised with metric 10

        In the following example, output information about all connected routers running IS-IS in all areas is displayed using the show isis topologycommand:

        Router# show isis topology
        IS-IS paths to level-1 routers
        System Id       Metric  Next-Hop        Interface       SNPA
        0000.0000.000C 
        0000.0000.000D  20      0000.0000.00AA  Se1/0/1         *HDLC*
        0000.0000.000F  10      0000.0000.000F  GE0/0/1         0050.e2e5.d01d
        0000.0000.00AA  10      0000.0000.00AA  Se1/0/1         *HDLC*
        IS-IS paths to level-2 routers
        System Id       Metric  Next-Hop        Interface       SNPA
        0000.0000.000A  10      0000.0000.000A  GE0/0/3         0010.f68d.f063
        0000.0000.000B  20      0000.0000.000A  GE0/0/3         0010.f68d.f063
        0000.0000.000C  --
        0000.0000.000D  30      0000.0000.000A  GE0/0/3         0010.f68d.f063
        0000.0000.000E  30      0000.0000.000A  GE0/0/3         0010.f68d.f063

        In the following example, output information to confirm that the local router has formed all the necessary IS-IS adjacencies with other IS-IS neighbors is displayed using the show clns is-neighborscommand. To display the IPv6 link-local addresses of the neighbors, specify the detail keyword.

        Router# show clns is-neighbors detail
        System Id      Interface   State  Type Priority  Circuit Id         Format
        0000.0000.00AA Se1/0/1     Up     L1   0         00                 Phase V
          Area Address(es): 49.0001
          IPv6 Address(es): FE80::YYYY:D37C:C854:5
          Uptime: 17:21:38
        0000.0000.000F Et0/0/1     Up     L1   64        0000.0000.000C.02  Phase V
          Area Address(es): 49.0001
          IPv6 Address(es): FE80::XXXX:E2FF:FEE5:D01D
          Uptime: 17:21:41
        0000.0000.000A Et0/0/3     Up     L2   64        0000.0000.000C.01  Phase V
          Area Address(es): 49.000b
          IPv6 Address(es): FE80::ZZZZ:F6FF:FE8D:F063
          Uptime: 17:22:06

        In the following example, detailed output information that displays both end system (ES) and intermediate system (IS) neighbors is displayed using the show clns neighbors command with the detail keyword.

        Router# show clns neighbors detail
        System Id          Interface    SNPA            State  Holdtime  Type Protocol
        0000.0000.0007     GE3/3        aa00.0400.6408  UP     26        L1   IS-IS
        Area Address(es): 20
        IP Address(es): 172.16.0.42*
        Uptime: 00:21:49
        0000.0C00.0C35     GE3/2        0000.0c00.0c36  Up     91        L1   IS-IS
        Area Address(es): 20
        IP Address(es): 192.168.0.42*
        Uptime: 00:21:52
        0800.2B16.24EA     GE3/3        aa00.0400.2d05  Up     27        L1   M-ISIS
        Area Address(es): 20
        IP Address(es): 192.168.0.42*
        IPv6 Address(es): FE80::2B0:8EFF:FE31:EC57
        Uptime: 00:00:27
        0800.2B14.060E     GE3/2        aa00.0400.9205  Up     8         L1   IS-IS
        Area Address(es): 20
        IP Address(es): 192.168.0.30*
        Uptime: 00:21:52

        In the following example, detailed output information about LSPs received from other routers and the IPv6 prefixes they are advertising is displayed using the show isis databasecommand with the detail keyword specified:

        Router# show isis database detail
        IS-IS Level-1 Link State Database
        LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime  ATT/P/OL
        0000.0C00.0C35.00-00  0x0000000C   0x5696        325           0/0/0
          Area Address: 47.0004.004D.0001
          Area Address: 39.0001
          Metric: 10   IS 0000.0C00.62E6.03
          Metric: 0    ES 0000.0C00.0C35
         --More--
        0000.0C00.40AF.00-00* 0x00000009   0x8452        608           1/0/0
          Area Address: 47.0004.004D.0001
          Topology: IPv4 (0x0) IPv6 (0x2)
          NLPID: 0xCC 0x8E
          IP Address: 172.16.21.49
          Metric: 10   IS 0800.2B16.24EA.01
          Metric: 10   IS 0000.0C00.62E6.03
          Metric: 0    ES 0000.0C00.40AF
          IPv6 Address: 2001:DB8::/32
          Metric: 10   IPv6 (MT-IPv6) 2001:DB8::/64
          Metric: 5    IS-Extended cisco.03
          Metric: 10   IS-Extended cisco1.03
          Metric: 10    IS (MT-IPv6) cisco.03
        IS-IS Level-2 Link State Database:
        LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime      ATT/P/OL
        0000.0000.000A.00-00  0x00000059   0x378A        949               0/0/0
          Area Address: 49.000b
          NLPID:        0x8E
          IPv6 Address: 2001:DB8:1:1:1:1:1:1
          Metric: 10         IPv6 2001:DB8:2:YYYY::/64
          Metric: 10         IPv6 2001:DB8:3:YYYY::/64
          Metric: 10         IPv6 2001:DB8:2:YYYY::/64
          Metric: 10         IS-Extended 0000.0000.000A.01
          Metric: 10         IS-Extended 0000.0000.000B.00
          Metric: 10         IS-Extended 0000.0000.000C.01
          Metric: 0          IPv6 11:1:YYYY:1:1:1:1:1/128
          Metric: 0          IPv6 11:2:YYYY:1:1:1:1:1/128
          Metric: 0          IPv6 11:3:YYYY:1:1:1:1:1/128
          Metric: 0          IPv6 11:4:YYYY:1:1:1:1:1/128
          Metric: 0          IPv6 11:5:YYYY:1:1:1:1:1/128
        0000.0000.000A.01-00  0x00000050   0xB0AF        491               0/0/0
          Metric: 0          IS-Extended 0000.0000.000A.00
          Metric: 0          IS-Extended 0000.0000.000B.00

        The following example shows output from the show isis ipv6 rib command. An asterisk (*) indicates prefixes that have been installed in the master IPv6 RIB as IS-IS routes. Following each prefix is a list of all paths in order of preference, with optimal paths listed first and suboptimal paths listed after optimal paths.

        Router# show isis ipv6 rib
         
        IS-IS IPv6 process "", local RIB
          2001:DB8:88:1::/64
            via FE80::210:7BFF:FEC2:ACC9/GigabitEthernet2/0/0, type L2  metric 20 LSP [3/7]
            via FE80::210:7BFF:FEC2:ACCC/GigabitEthernet2/1/0, type L2  metric 20 LSP [3/7]
        * 2001:DB8:1357:1::/64
            via FE80::202:7DFF:FE1A:9471/GigabitEthernet2/1/0, type L2  metric 10 LSP [4/9]
        * 2001:DB8:45A::/64
            via FE80::210:7BFF:FEC2:ACC9/GigabitEthernet2/0/0, type L1  metric 20 LSP [C/6]
            via FE80::210:7BFF:FEC2:ACCC/GigabitEthernet2/1/0, type L1  metric 20 LSP [C/6]
            via FE80::210:7BFF:FEC2:ACC9/GigabitEthernet2/0/0, type L2  metric 20 LSP [3/7]
            via FE80::210:7BFF:FEC2:ACCC/GigabitEthernet2/1/0, type L2  metric 20 LSP [3/7]

        Additional References

        Related Documents

        Related Topic

        Document Title

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

        Cisco IOS IP Routing: ISIS Command Reference

        Overview of Cisco IS-IS conceptual information with links to all the individual IS-IS modules

        "Integrated IS-IS Routing Protocol Overview" module

        ISO CLNS commands

        Cisco IOS ISO CLNS Command Reference

        Command Lookup Tool

        http://tools.cisco.com/Support/CLILookup

        Standards

        Standards

        Title

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

        --

        MIBs

        MIBs

        MIBs Link

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

        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

        RFCs

        Title

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

        --

        Technical Assistance

        Description

        Link

        The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

        http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

        Feature Information for IPv6 Routing: Route Redistribution

        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 1 Feature Information for IPv6 Routing: Route Redistribution

        Feature Name

        Releases

        Feature Information

        IPv6 Routing: Route Redistribution

        12.2(2)T

        12.3

        12.2(25)SEA

        12.2(25)SG

        3.2.0SG

        15.0(2)SG

        12.2(33)SRA

        12.2(18)SXE

        Cisco IOS XE Release 3.5E

        IS-IS for IPv6 supports redistributing routes into an IPv6 IS-IS routing process and redistributing IPv6 IS-IS routes between IS-IS levels.

        The following commands were introduced or modified: address-family ipv6, redistribute isis (IPv6).