summary

Use summary to configure an IPv6 IS-IS summary route.

Use undo summary to remove an IPv6 IS-IS summary route.

Syntax

summary ipv6-prefix prefix-length [ avoid-feedback | generate_null0_route | [ level-1 | level-1-2 | level-2 ] | tag tag ] *

undo summary ipv6-prefix prefix-length [ level-1 | level-1-2 | level-2 ]

Default

No summary route is configured.

Views

IS-IS IPv6 unicast address family view

Predefined user roles

network-admin

Parameters

ipv6-prefix: Specifies an IPv6 prefix for the summary route.

prefix-length: Specifies the length of the IPv6 prefix, in the range of 0 to 128.

avoid-feedback: Avoids learning the summary route by route calculation.

generate_null0_route: Generates a NULL 0 route to avoid routing loops.

level-1: Summarizes only the routes redistributed to Level-1.

level-1-2: Summarizes all the routes redistributed to both Level-1 and Level-2.

level-2: Summarize only the routes redistributed to Level-2.

tag: Specifies an administrative tag in the range of 1 to 4294967295.

Usage guidelines

You can summarize routes with the same next hop into a single route to reduce the size of the routing table, as well as the size of the LSDB. This command can summarize both learned and redistributed IPv6 IS-IS routes. The cost of the summary route is the smallest cost of the summarized routes.

If no level is specified, the command applies to Level-2.

Examples

# Configure summary route 2002::/32.

<Sysname> system-view
[Sysname] isis
[Sysname-isis-1] address-family ipv6
[Sysname-isis-1-ipv6] summary 2002:: 32