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OSPF Complete Implementation by John T. Moy

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7. Originating LSAs

In this chapter, we examine how the OSPF implementation originates LSAs. These may be new LSAs or new instances of LSAs whose contents must change. But before we discuss the process of originating LSAs, we should enumerate the reasons for (re)originating an LSA.

1. A local change in router state may require that the router (re)originate one or more LSAs. For example, if one of the router’s interfaces changes state (see Section 8.4), the router may need to reoriginate its router-LSA. If one of the router’s neighbors changes state (Section 8.1), the router may need to (re)originate both its router-LSA and the network-LSA for the associated IP subnet. Changes in routing table entries may cause the (re)origination of summary-LSAs, ...

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