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IS-IS Network Design Solutions by Scott Sturgess, Abe Martey

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Flooding and Link-State Database Synchronization

Link-state routing protocols, such as IS-IS and the OSPF Protocol, operate on the premise that all nodes in an area obtain the same description or view of the area through the exchange of link-state information (LSPs in the case of IS-IS). The LSPs, which are stored in the Link-State database, are then fed as input to the route calculation algorithm (SPF algorithm), to determine the shortest path to any node in the area. A consistent view of the area's topology allows all routers in the area to independently calculate optimal and loop-free routes to all destinations within the area. Each IS-IS router assembles information about its immediate surrounding, such as its own SysID and those of neighbors, ...

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