Configure Inter-VRF IPv6 Accept Policies on VRFs

About this task

Configure IPv6 IS-IS accept policies on a VRF to use inter-VRF accept policies in the SPB cloud. You can use IPv6 IS-IS accept policies to redistribute routes between different VRFs, including the global routing table (GRT). First you apply the filter, and then you match the filter based on the I-SID, which represents the Layer 3 VSN context.

Note

• The ipv6 isis apply accept [vrf WORD<1-16>] command can disrupt traffic and cause temporary traffic loss. After you apply ipv6 isis apply accept [vrf<1-16>], the command reapplies the accept policies, which deletes all of the IS-IS routes, and adds the IS-IS routes again. You should make all the relevant accept policy changes, and then apply ipv6 isis apply accept [vrf WORD<1-16>] at the end.

• If you use the ipv6 accept command for inter-VRF routes based on the remote I-SID, the device accepts routes form other local VRFs to the current VRF, therefore if the accepted I-SID is configured on the local BEB, the device accepts its own IPv6 routes advertised under the accepted I-SID.

• If the route policy changes, you must reapply the IPv6 IS-IS accept policy, unless it was the last sequence in the configuration.

1. Enter VRF Router Configuration mode for a specific VRF context:

   enable

   configure terminal

   router vrf WORD<1-16>

2. Optional: If you want to accept routes from a variety of I-SIDs, create an I-SID list before you create an IPv6 IS-IS accept policy for the I-SID list:

   ip isid-list WORD<1–32> {<0–16777215> | list WORD<1–1024>}

   

   Note

   When creating an I-SID list, you can add I-SID entries until the maximum limit for supported Layer 3 I-SIDs is reached. The system truncates any additional I-SID entries. The maximum limit includes the I-SIDs for locally configured Layer 3 VSNs and the I-SIDs specified for IS-IS accept policy filters.

   Use the command show ip isid-list vrf WORD<1-16> to view the list of truncated I-SIDs.

3. Configure an IPv6 IS-IS accept policy instance with a route policy.

   Use one of the following options:

   1. Configure an IPv6 IS-IS accept policy based on a specific advertising BEB:

      ipv6 isis accept adv-rtr <x.xx.xx> [enable][i-sid <0-16777215>][isid-list WORD<1-32>] [route-map WORD<1–64>]

   2. Configure an IPv6 IS-IS accept policy based on a particular I-SID:

      ipv6 isis accept i-sid <0-16777215> [enable] [route-map WORD<1–64>]

   3. Configure an IPv6 IS-IS accept policy based on a particular I-SID list:

      ipv6 isis accept isid-list WORD<1-32> [enable] [route-map WORD<1–64>]

4. Enable the configured IPv6 IS-IS accept policies:

   ipv6 isis accept [adv-rtr <x.xx.xx>] [i-sid <0-16777215>] [isid-list WORD<1-32>] enable

5. Exit to Global Configuration mode:

   exit

6. Apply the IPv6 IS-IS accept policy changes, which removes and re-adds all routes with updated filters:

   ipv6 isis apply accept [vrf WORD<1–16>]

Example

Configure Inter-VRF accept policies on a VRF:

Switch:1>enable
Switch:1#configure terminal
Switch:1(config)#router vrf red
Switch:1(router-vrf)#ipv6 isis accept i-sid 100 enable
Switch:1(router-vrf)#exit
Switch:1(config)#ipv6 isis apply accept vrf red