Comparing OSPF for IPv4 and IPv6

As you might expect, OSPFv3—the version of OSPF that supports IPv6—works a lot like OSPFv2, which supports IPv4. The next few pages work through some of the terminology, concepts, similarities, and differences in how OSPF works for IPv6 versus IPv4.

OSPF Routing Protocol Versions and Protocols

First, when most engineers refer to “OSPF,” they most likely refer to OSPF as used with IPv4, and specifically, OSPF version 2 (OSPFv2). Once, there was an OSPF version 1, but OSPF version 2 (OSPFv2) followed soon afterward. When OSPF became widely used as an IPv4 routing protocol, back in the early to mid 1990s, everyone used OSPFv2 and not OSPFv1. So, even in the early days of OSPF, there was no need for people to talk ...

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