Configuring IS-IS on Broadcast Multiaccess Links
Even though IS-IS operation on broadcast links differs a little from IS-IS operation on point-to-point links, the basic configuration is not significantly different. With broadcast links, you also activate the IS-IS routing process and then enable IS-IS routing on the interfaces where adjacencies are to be formed. In the LAN configuration example shown Figure 9-3, three routers (RT1, RT2, and RT3) are interconnected over an Ethernet link. All routers are in the same area.
Figure 9-3. Ethernet LAN configuration example.
A significant difference between a point-to-point scenario and this example is ...
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