
Chapter 14 • IPv6 Routing 253
14.3.1 DIFFERENCES FROM OSPF FOR IPV4
RFC 2740, “OSPF for IPv6,” provides the specification for adapting OSPF to
use with IPv6. For the most part, OSPF for IPv6 uses the same mechanisms
used in OSPF for IPv4 (defined in RFC 2328, “OSPF Version 2”). Aswith any
IP routing protocol, OSPF was modified for use with IPv6 to accommodate
128-bit (rather than 32-bit) addresses; other changes were required as well.
These differences are spelled out in RFC 2740 and include the following.
Link versus subnet processing Under IPv6, link means “a communica-
tion facility or medium over which nodes can communicate at the
link layer” (RFC