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

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Settings That Must Match for OSPF Neighborship

After an OSPF router has discovered a potential neighbor by receiving a Hello from the other router, the local router considers the router that sent the Hello as a potential neighbor. The local router must examine the contents of the received Hello, plus a few other factors, compare those settings to its own, and check for agreement, and only then can that other router be considered an OSPF neighbor.

For reference, the following list details the items seen in OSPF Hello messages. Note that some fields might not be present in a Hello, depending on the conditions in the network.

Image OSPF router ID

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