IS-IS Over NBMA Networks
The behavior of link-state protocols is different when handling non-broadcast multiaccess networks. In this situation, a difference always exists between physical and logical topology. For broadcast networks, for example, a pseudonode is created and is flooded with the ID set to the ID of the DIS. The broadcast model will also be successful in the frame or ATM cloud, as long as all the virtual circuits are operating properly. When a PVC breaks down, forwarding and routing is blackholed.
A router that loses its virtual circuit to the DIS will try to become the DIS. Other routers will send the ID of the actual DIS to this router. The router that has lost its virtual circuit to the DIS cannot send packets because the ...
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