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How is the link state database updated by default?

Asked by: Christine Brown 198 views IT September 15, 2018

How is the link state database updated by default?

1 Answers

  1. +7Votes  

    A few states that an OSPF router passes before it is completely contiguous:
    1.Down: This state has not exchanged information with other routers. First, the hello packet is sent out from its ospf interface, and the DR (if it is a broadcast network) and any other routers are not known. The hello packet is sent using the multicast address 224.0.0.5.
    2.Attempt: Only suitable for NBMA networks. In the NBMA network, the neighbors are manually specified. In this state, the router will use HelloInterval instead of PollInterval to send Hello packets.
    3.Init: Indicates in DeadInterval The Hello packet was received, but the 2-Way communication is still not established.
    4.two-way: Two-way session establishment, and RIDs appear in each other’s neighbor list. (If it is a broadcast network: for example: Ethernet. At this time, DR, BDR should be elected.)
    5.ExStart: Initial state of information exchange, in which the local router and neighbor will establish a Master/Slave relationship, and Determine the DD Sequence Number, the router ID is the master. 6.Exchange: The information exchange state, the local router and the neighbor exchange one or more DBD packets (also called DDP). The DBD contains summary information about the LSA entries in the LSDB).
    7.Loading: Information loading status: After receiving the DBD, compare the received information with the information in the LSDB. If there is an updated link state entry in the DBD, an LSR is sent to the other party to request a new LSA.
    8. Full: Completely adjacency state, the link state database between adjacent nodes is synchronized, and the neighbor link state request list is empty and the neighbor state is Loading.

    Ann Wood- September 16, 2018 |