TP-Link T3700G-28TQ T3700G-28TQ V1 UG - Page 180
Work Flow Diagram
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5) After two routers have finished the synchronization of link state database, a complete adjacency relation will be established. 6) When the intra-area routers have an identical link state database, each of them will calculate a loop-free topology through SPF algorithm with itself as the root thus to describe the shortest forward path to every network node it knows, and create a routing table according to the topology of shortest forward path and provide a basis for data forwarding. 7) After the establishment of routing table, if the network remains stable, the neighbors would discover and maintain their neighbor relationships by sending out Hello packets at regular intervals. And the adjacent routers would recalculate the routing table by periodical LSA update in order to maintain valid entries in the routing table. 8) Any new routers joining the network will accept the current DR/BDR and synchronize the link state database with them until a complete adjacency relation is established. During synchronizing the link state database, DR/BDR will obtain LSA from the newly-joint routers and then flood this LSA to the adjacent routers who then will flood it to the other ports till the entire network. 1. Work Flow Diagram The diagram below takes two routers for example to introduce in the Ethernet module the detailed steps of two routers from failure state to complete adjacency state and the relevant packet types involved in the process. Note: To facilitate the description the diagram below shows the LSA synchronization after the DD exchange, while in reality these two processes are simultaneous. 169