Link state protocol
The link state protocol transmits the connection state between routers, and each router notifies other routers of the link state it knows. In this way, the routers in the network all know the topology of the entire network, and the route is obtained according to the SPF (Shortest Path First) algorithm.
The protocol structure based on the link state algorithm is complex and difficult to manage. However, because each router understands the topology of the entire network, there is no need to worry about the impact of routing loops. At the same time, it has a fast convergence speed and requires a small amount of information to be transmitted, which can save network bandwidth.
Typical protocols based on link state algorithms are OSPF and IS-IS.
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