IS-IS IPv6 Multi-Process Support

The IS-IS IPv6 Multi-Process Support feature enables support for mutual redistribution of IPv6 routes between multiple IS-IS IPv6 instances and allows the IS-IS IPv6 instances to install routes in non-default virtual routing and forwarding (VRF) instances.

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Prerequisites for IS-IS IPv6 Multi-Process Support

  • You must enable IPv6 unicast routing before ISIS IPv6 configuration.

  • You must enable IPv6 on an interface, by assigning an IPv6 address to the interface or by using the ipv6 enable command, before associating the interface with an ISIS IPv6 instance.

  • You must define a virtual routing and forwarding (VRF) and enable an IPv6 address family in the VRF before associating an ISIS IPv6 instance with that VRF.

Information About IS-IS IPv6 Multi-Process Support

IS-IS IPv6 Multi-Process Support Overview

The IS-IS IPv6 Multi-Process Support feature allows you to create up to 28 IPv6-enabled IS-IS instances and enables these IPv6 instances to be associated with any VRF and not only the default VRF. The device can redistribute IPv6 routes between multiple IPv6 IS-IS instances in the same VRF including the default VRF. The device can also redistribute routes between an IS-IS instance and other routing protocols such as RIP and OSPFv3 operating in the same VRF, including routing protocols in the default VRF.

How to Configure IS-IS IPv6 Multi-Process Support

Configuring IS-IS IPv6 Multi-Process Support

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    vrf definition vrf-name

    4.    address-family ipv6 [unicast]

    5.    exit

    6.    exit

    7.    interface type number

    8.    (Optional) vrf forwarding vrf-name

    9.    ipv6 address ipv6-prefix/prefix-length

    10.    ipv6 router isis process-tag

    11.    exit

    12.    Repeat Step 7 to Step 11 to configure IS-IS routing process and VRFs for IPv6 on different interfaces.

    13.    router isis process-tag

    14.    (Optional) vrf vrf-name

    15.    net network-entity-title

    16.    is-type [level-1 | level-1-2 | level-2-only]

    17.    log-adjacency-changes

    18.    address-family ipv6 [unicast]

    19.    redistribute source-protocol [process-id] [route-map map-tag]

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

    21.    exit

    22.    exit

    23.    route-map map-tag [permit | deny] [sequence-number]

    24.    match route-type {level-1 | level-2}

    25.    set metric metric-value

    26.    set level {level-1 | level-2 | level-1-2}

    27.    end


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example: 
    Device> enable
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.

     
    Step 2 configure terminal


    Example: 
    Device# configure terminal
     

    Enters global configuration mode.

     
    Step 3 vrf definition vrf-name


    Example: 
    Device(config)# vrf definition v1
     

    Configure a virtual routing and forwarding (VRF) routing table instance and enters VRF configuration mode

     
    Step 4 address-family ipv6 [unicast]


    Example: 
    Device(config-vrf)# address-family ipv6
     

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

    Note   

    The unicast keyword specifies the unicast IPv6 unicast address family. By default, the device 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 exit


    Example: 
    Device(config-vrf-af)# exit
     

    Exits the address family configuration mode and enters VRF configuration mode.

     
    Step 6 exit


    Example: 
    Device(config-vrf)# exit
     

    Exits the VRF configuration mode and enters global configuration mode.

     
    Step 7 interface type number


    Example: 
    Device(config)# interface FastEthernet 0/2
     

    Configures an interface type and enters interface configuration mode.

     
    Step 8 vrf forwarding vrf-name


    Example: 
    Device(config-if)# vrf forwarding v1
          		(Optional)

    Associates a Virtual Routing and Forwarding (VRF) or a virtual network with an interface or subinterface

     
    Step 9 ipv6 address ipv6-prefix/prefix-length


    Example: 
    Device(config-if)# ipv6 address 2001:DB8::/32
     

    Sets an IPv6 address for an interface.

     
    Step 10 ipv6 router isis process-tag


    Example: 
    Device(config-if)# ipv6 router isis v1a
     

    Configures an IS-IS routing process for IPv6 on an interface and attaches a tag to the routing process.

    Note   

    The configuration of the interface-mode ipv6 router isis command will overwrite the prior configuration on that interface, but only if the new configuration is attempting to change the interface ownership to a different instance that is in the same VRF as the currently configured owner instance. The configuration will be rejected if the attempted change is between two instances that are associated with different VRFs.

     
    Step 11 exit


    Example: 
    Device(config-if)# exit
     

    Exits the interface configuration mode and enters global configuration mode.

     
    Step 12 Repeat Step 7 to Step 11 to configure IS-IS routing process and VRFs for IPv6 on different interfaces.

    Example:  

    --

     
    Step 13 router isis process-tag


    Example: 
    Device(config)# router isis v1a
     

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

     
    Step 14 vrf vrf-name


    Example: 
    Device(config-if)# vrf v1
          		(Optional)

    Associates a Virtual Routing and Forwarding (VRF) instance or a virtual network with an interface or subinterface

     
    Step 15 net network-entity-title


    Example: 
    Device(config-router)# net 49.000b.0000.0001.0002.00
     

    Configures IS-IS network entity title (NET) for a CLNS routing process.

     
    Step 16 is-type [level-1 | level-1-2 | level-2-only]


    Example: 
    Device(config-router)# is-type level-1
     

    Configures the routing level for an instance of the IS-IS routing process.

     
    Step 17 log-adjacency-changes


    Example: 
    Device(config-router)# log-adjacency-changes
     

    Configure the device to send a syslog message when an Open Shortest Path First (OSPF) neighbor goes up or down.

     
    Step 18 address-family ipv6 [unicast]


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

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

    Note   

    The unicast keyword specifies the unicast IPv6 unicast address family. By default, the device 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 19 redistribute source-protocol [process-id] [route-map map-tag]


    Example: 
    Device(config-router-af)# redistribute isis v1a route-map abc
     

    Specifies the route map that should be checked to filter the importation of routes from this source routing protocol to the current routing protocol.

     
    Step 20 redistribute isis [process-id] {level-1 | level-2} into {level-1 | level-2} distribute-list list-name


    Example: 
    Device(config-router-af)# redistribute isis level-1 into level-2 distribute-list xyz
     

    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.

     
    Step 21 exit


    Example: 
    Device(config-router-af)# exit
     

    Exits the address family configuration mode and enters router configuration mode.

     
    Step 22 exit


    Example: 
    Device(config-router)# exit
     

    Exits the router configuration mode and enters global configuration mode.

     
    Step 23 route-map map-tag [permit | deny] [sequence-number]


    Example: 
    Device(config)# route-map abc permit 10
     

    Defines the conditions for redistributing routes from one routing protocol into another or from one IS-IS level to another and enters route-map configuration mode.

     
    Step 24 match route-type {level-1 | level-2}


    Example: 
    Device(config-route-map)# match route-type level-1
     

    Defines the route-type match criterion.

     
    Step 25 set metric metric-value


    Example: 
    Device(config-route-map)# set metric 56
     

    Configures the metric value used to redistribute routes.

     
    Step 26 set level {level-1 | level-2 | level-1-2}


    Example: 
    Device(config-route-map)# set level level-2
     

    Specifies the routing level of routes to be advertised into a specified area of the routing domain.

     
    Step 27 end


    Example: 
    Device(config-route-map)# end
     

    Exits the route-map configuration mode and enters privileged EXEC mode.

     

    Configuration Examples for IS-IS IPv6 Multi-Process Support

    Example: IS-IS IPv6 Multi-Process Support Configuration

    Device> enable
Device# configure terminal
Device(config)# vrf definition v1
Device(config-vrf)# address-family ipv6
Device(config-router-af)# exit
Device(config-router)# exit
Device(config)# interface FastEthernet 0/2
Device(config-if)# ipv6 address 2001:DB8::/32
Device(config-if)# vrf forwarding v1
Device(config-if)# ipv6 router isis v1a
Device(config-if)# exit
Device(config)# interface FastEthernet 0/3
Device(config-if)# ipv6 address 2001:DB8::/48
Device(config-if)# vrf forwarding v1
Device(config-if)# ipv6 router isis v1b
Device(config-if)# exit
Device(config)# router isis v1a
Device(config-router)# vrf v1
Device(config-router)# net 49.000b.0000.0001.0002.00
Device(config-router)# is-type level-1
Device(config-router)# log-adjacency-changes
Device(config-router)# address-family ipv6
Device(config-router-af)# redistribute isis v1b route-map abc
Device(config-router-af)# redistribute isis level-1 into level-2 distribute-list xyz
Device(config-router-af)# exit
Device(config-router)# exit
Device(config)# router isis v1b
Device(config-router)# vrf v1
Device(config-router)# net 49.000b.0000.000a.0001.00
Device(config-router)# log-adjacency-changes
Device(config-router)# address-family ipv6
Device(config-router-af)# redistribute isis v1a route-map abc
Device(config-router-af)# exit
Device(config-router)# exit
Device(config)# route-map abc permit 10
Device(config-route-map)# match route-type level-1
Device(config-route-map)# set metric 56
Device(config-route-map)# set level level-2

    Additional References for IS-IS IPv6 Multi-Process Support

    Related Documents

    Related Topic Document Title

    Cisco IOS commands

    Cisco IOS Master Command List, All Releases

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    Feature Information for IS-IS IPv6 Multi-Process Support

    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 IS-IS IPv6 Multi-Process Support

    Feature Name

    Releases

    Feature Information

    IS-IS IPv6 Multi-Process Support

    Cisco IOS XE Release 3.14S

    The IS-IS IPv6 Multi-Process Support feature enables support for mutual redistribution of IPv6 routes between multiple IS-IS IPv6 instances and allows the IS-IS IPv6 instances to install routes in non-default virtual routing and forwarding (VRF) instances.

    No new commands were introduced or modified.