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 Action Purpose
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

(Optional) 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

(Optional) 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.