O'Reilly logo

IS-IS: Deployment in IP Networks by Alvaro Retana, Russ White

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Link State Protocol Concepts

There are two fundamental ways of propagating information through a network: Each router can advertise the destinations it can reach, either devices or networks, to each of its directly connected neighbors, or each router can advertise the state of each of its connections to other devices or to networks to every other router on the network.

Note

When a router or intermediate system advertises a destination as reachable, it means that the router is either connected to the network, or that it knows a valid, loop-free path to reach the destination. How advertisements occur, and how advertisements are used, relate to the actual design of the routing protocol, its packet formats, and its algorithms.

Using Figure 1-9

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required