Command Line Reference Guide

Open Shortest Path First (OSPFv2 and OSPFv3) | 957

Open Shortest Path First (OSPFv2 and

OSPFv3)

Overview

Open Shortest Path First version 2 for IPv4 is supported on platforms c e s

Open Shortest Path First version 3 (OSPFv3) for IPv6 is supported on platforms c e

OSPF is an Interior Gateway Protocol (IGP), which means that it distributes routing information

between routers in a single Autonomous System (AS). OSPF is also a link-state protocol in which all

routers contain forwarding tables derived from information about their links to their neighbors.

The fundamental mechanisms of OSPF (flooding, DR election, area support, SPF calculations, etc.) are

the same for OSPFv2 and OSPFv3. OSPFv3 runs on a per-link basis instead of on a per-IP-subnet

basis.

This chapter is divided into 2 sections. There is no overlap between the two sets of commands. You

cannot use an OSPFv2 command in the IPv6 OSPFv3 mode.

• OSPFv2 Commands

• OSPFv3 Commands

Note: The C-Series supports OSPFv3 with FTOS version 7.8.1.0 and later.

Note: FTOS version 7.8.1.0 introduces Multi-Process OSPF on IPv4 (OSPFv2) only. It is not supported

on OSPFv3 (IPv6).

Note that the CLI now requires that the Process ID be included when entering the

ROUTER-OSPF mode. Each command entered applies to the specified OSPFv2

process only.