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configuring the preference statement for the IS-IS level. The numbers following the<br />

brackets indicate how long the routing table has known about the route. The metric<br />

value is the cost to this address. The default IS-IS metric is 10. For example, in the<br />

route to 10.0.24.0, the metric is 20 because that network is two hops away.<br />

The inet.0 table also contains a route to 192.168.19.1/32, which is this router’s loopback<br />

address. This route appears in the routing table because you configured IS-IS on<br />

the router’s loopback interface, lo0.0.<br />

The ISO address family creates a separate routing table, iso.0, which is for the ISO<br />

routes to the NET destinations. Here, this table contains one route, to the Level 2<br />

neighbor, which is the only NET destination in the network.<br />

You can also see just the routes learned by IS-IS:<br />

aviva@RouterG> show route protocol isis<br />

inet.0: 11 destinations, 11 routes (11 active, 0 holddown, 0 hidden)<br />

+ = Active Route, - = Last Active, * = Both<br />

10.0.24.0/24 *[IS-IS/18] 22:58:48, metric 20<br />

> to 10.0.1.1 via fe-0/0/1.0<br />

192.168.18.1/32 *[IS-IS/18] 22:58:48, metric 10<br />

> to 10.0.1.1 via fe-0/0/1.0<br />

See Also<br />

Recipe 9.1<br />

11.4 Configuring IS-IS for IPv6<br />

Problem<br />

You want to use IS-IS on an IPv6 network.<br />

Solution<br />

The IS-IS configuration for an IPv6 network is the same as for IPv4. Configure the<br />

interfaces, enable ISO on the IS-IS interfaces, and configure a NET on lo0:<br />

[edit protocols isis]<br />

aviva@RouterG# set interface fe-0/0/1<br />

aviva@RouterG# set interface fe-1/0/1<br />

aviva@RouterG# set interface lo0.0<br />

[edit interfaces]<br />

aviva@RouterG# set fe-0/0/1 unit 0 family iso<br />

aviva@RouterG# set fe-1/0/1 unit 0 family iso<br />

aviva@RouterG# set lo0 unit 0 family iso address 49.0020.1921.6801.9001.00<br />

This is the Title of the Book, eMatter Edition<br />

Copyright © 2008 O’Reilly & Associates, Inc. All rights reserved.<br />

Configuring IS-IS for IPv6 | 361

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