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JUNOS Cookbook by Aviva Garrett

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11.1. Configuring IS-IS

Problem

You want to configure IS-IS on a JUNOS router.

Solution

There are three steps to setting up IS-IS. First, define the interfaces on which IS-IS will run and the levels to which the interfaces will be attached:

	[edit protocols isis]
	aviva@RouterG# set interface fe-0/0/1
	aviva@RouterG# set interface fe-1/0/0 level 2 disable
	aviva@RouterG# set interface  
lo0.0

Second, enable the ISO protocol family on the interfaces:

	[edit interfaces]
	aviva@RouterG# set fe-0/0/1 unit 0 family iso
	aviva@RouterG# set fe-1/0/0 unit 0 family iso

Finally, configure a NET on the lo0 interface:

	[edit interfaces]
	aviva@RouterG# set lo0 unit 0 family iso address 49.0020.1921.6801.9001.00

Discussion

The basic setup to get IS-IS up and running on your router is straightforward. Enable the protocol on all router interfaces that will participate in the IS-IS domain and specify the level at which they should run. This recipe configures the IS-IS on the router topology shown in Figure 11-1. Here, because interface fe-0/0/1 is a border node between areas 20 and 30, you need to specify only the interface name because, by default, all IS-IS interfaces are both Level 1 and Level 2 interfaces.

The other interface, fe-1/0/0, is only in area 20, so it is a Level 1 router. For this interface, you disable Level 2 operation.

IS-IS network topology with one area

Figure 11-1. IS-IS network topology with one area

In addition to the network ...

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