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CCNP Routing and Switching ROUTE 300-101: Official Cert Guide by Kevin Wallace

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LSA Type 1: Router LSA

ImageLesson 2: Type 1 LSA: Router

An LSA type 1, called a Router LSA, identifies an OSPF router based on its OSPF router ID (RID). Each router creates a Type 1 LSA for itself and floods the LSA throughout the same area. To flood the LSA, the originating router sends the Type 1 LSA to its neighbors inside the same area, who in turn send it to their other neighbors inside the same area, until all routers in the area have a copy of the LSA.

Besides the RID of the router, this LSA also lists information about the attached links. In particular, the Type 1 LSA lists

For each interface on which no designated router (DR) has been elected, ...

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