Overview

OSPFv3 and OSPFv2 have the following in common:

• 32-bit router ID and area ID.

• Hello, Database Description (DD), Link State Request (LSR), Link State Update (LSU), Link State Acknowledgment (LSAck).

• Mechanisms for finding neighbors and establishing adjacencies.

• Mechanisms for advertising and aging LSAs.

OSPFv3 and OSPFv2 have the following differences:

• OSPFv3 runs on a per-link basis. OSPFv2 runs on a per-IP-subnet basis.

• OSPFv3 supports running multiple processes on an interface, but OSPFv2 does not support.

• OSPFv3 identifies neighbors by router ID. OSPFv2 identifies neighbors by IP address.