Cisco CCNA Routing and Switching ICND2 200-101 Official Cert Guide

Becoming Neighbors and Exchanging the LSDB

Configuring Neighbor Authentication

The whole point of using OSPFv2 is to learn IPv4 routes. To do that, OSPFv2 routers must become neighbors, and then exchange the LSAs in their link-state databases (LSDB). The next few pages work through some particulars of the OSPFv2 protocols and neighbor states.

Note

OSPF protocols work slightly differently on point-to-point links (simpler) versus Ethernet links (more complex). To keep the next examples simpler, for easier learning, the examples assume the rules for point-to-point links. Later, in the “Using Designated Routers on Ethernet” section, you’ll read about ...