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OSPF and IS-IS: Choosing an IGP for Large-Scale Networks by Jeff Doyle

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4.6. Interface Databases

There are two databases in which an OSPF or IS-IS router stores information about its immediate environment: the interface and the neighbor database. The OSPF or IS-IS interface database records all the router interfaces on which the protocol is enabled and the interface parameters relevant to the protocol. The neighbor database likewise records all known neighbors and neighbor parameters, mostly based on the information from received Hello messages.

This section examines interface databases for OSPF and IS-IS. IS-IS neighbor databases could also be examined in this chapter, because IS-IS neighbors are adjacent after bidirectional communication is established. But OSPF neighbors are not fully adjacent until after database ...

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