CCNP Routing and Switching ROUTE 300-101 Official Cert Guide

LSA Type 1: Router LSA

Lesson 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, ...