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route-policy-name: Name of a routing policy, a string of 1 to 19 characters.

Description Use the ipv6 preference command to configure the preference for IPv6 IS-IS protocol.

Use the undo ipv6 preference command to configure the default preference for IPv6 IS-IS protocol.

The default preference is 15.

When a router runs multiple dynamic routing protocols at the same time, the system will assign a preference to each routing protocol. If several protocols find routes to the same destination, the route found by the protocol with the highest preference is selected.

Examples # Configure the preference of IPv6 IS-IS protocol as 20.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] ipv6 preference 20

ipv6 summary

Syntax ipv6 summary ipv6-prefixprefix-length[ avoid-feedback generate_null0_route [ level-1 level-1-2 level-2 ] tag tag ] *

undo ipv6 summary ipv6-prefixprefix-length[ level-1 level-1-2 level-2 ]

View IS-IS view

Parameters ipv6-prefix:IPv6 prefix of the summary route.

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

avoid-feedback: Specifies to avoid learning summary routes via routing calculation.

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

level-1: Specifies to summarize only the routes redistributed to Level-1 area.

level-1-2: Specifies to summarize all the routes redistributed to Level-1 and Level-2 areas.

level-2: Specifies to summarize only the routes redistributed to Level-2 area.

tag: Value of an administrative tag, in the range of 1 to 4294967295. n If no level is specified in the command, the default is level-2.

Description Use the ipv6 summary command to configure an IPv6 IS-IS summary route.

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