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Configuring IPv6 specific address family route parameters

To change the administrative distance for IPv6 IS-IS routes, enter the following command at the

IPv6 IS-IS unicast address family configuration level:

Brocade(config-isis-router-ipv6u)# distance 100

Syntax: [no] distance number

This command changes the administrative distance for all IPv6 IS-IS routes to 100.

The number parameter specifies the administrative distance. You can specify a value from 1 –

255. (Routes with a distance value of 255 are not installed in the routing table.) The default for

IPv6 IS-IS is 115.

Configuring summary prefixes

You can configure summary prefixes to aggregate IPv6 IS-IS route information. Summary prefixes

can enhance performance by reducing the size of the Link State database, reducing the amount of

data a router needs to send to its neighbors, and reducing the CPU cycles used for IPv6 IS-IS.

When you configure a summary prefix, the prefix applies only to Level-2 routes by default. You can

specify Level-1 only, Level-2 only, or Level-1 and Level-2 when you configure the prefix.

For example, to configure a summary prefix of 2001:db8::/32 to be advertised to Level-1 routes

only, enter the following command at the IPv6 IS-IS unicast address family configuration level:

Brocade(config-isis-router-ipv6u)# summary-prefix 2001:db8::/32 level-1

Syntax: [no] summary-prefix ipv6-prefix/prefix-length [level-1 | level-1-2 | level-2-only]

The ipv6-prefix/prefix-length parameter specifies the aggregate address. You must specify the

ipv6-prefix parameter in hexadecimal using 16-bit values between colons as documented in RFC

2373. You must specify the prefix-length parameter as a decimal value. A slash mark (/) must

follow the ipv6-prefix parameter and precede the prefix-length parameter.

The level-1 | level-1-2 | level-2-only parameter specifies the route types to which the aggregate

route applies. The default is level-2-only.

Redistributing routes into IPv6 IS-IS

To redistribute routes into IPv6 IS-IS, you can perform the following configuration tasks:

• Change the default redistribution metric (optional).

• Configure the redistribution of a particular route type into IPv6 IS-IS (mandatory).

The device can redistribute routes from the following route sources into IPv6 IS-IS:

• BGP4+.

• RIPng.

• OSPFv3.

• Static IPv6 routes.

• IPv6 routes learned from directly connected networks.

The device can also can redistribute Level-1 IPv6 IS-IS routes into Level-2 IPv6 IS-IS routes, and

Level-2 IPv6 IS-IS routes into Level-1 IPv6 IS-IS routes.

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