After the adjacencies are established, the routers might begin sending out LSAs. As the term flooding implies, the advertisements are sent to every neighbor. In turn, each received LSA is copied and forwarded to every neighbor except the one that sent the LSA. This process is the source of one of link state’s advantages over distance vector. LSAs are forwarded almost immediately, whereas distance vector protocols based on the Bellman-Ford algorithm must run its algorithm and update its route table before routing updates, even the triggered ones, can be forwarded. As a result, link state protocols converge much faster than distance vector protocols converge when the topology changes.
Link State advantage over distance vector
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