64 IPV6 OSPFV 3 CONFIGURATIONWhen configuring OSPF, go to these sections for information you are interested in:■ “Introduction to OSPFv3” on page 1049■ “IPv6 OSPFv3 Configuration Task List” on page 1051■ “Configuring OSPFv3 Basic Functions” on page 1052■ “Configuring OSPFv3 Area Parameters” on page 1053■ “Configuring OSPFv3 Routing Information Management” on page 1054■ “Tuning and Optimizing an OSPFv3 Network” on page 1056■ “Displaying and Maintaining OSPFv3” on page 1059■ “OSPFv3 Configuration Examples” on page 1059■ “Troubleshooting OSPFv3 Configuration” on page 1066Introduction toOSPFv3OSPFv3 Overview OSPFv3 is OSPF (Open Shortest Path First) version 3 for short, supporting IPv6 andcompliant with RFC2740 (OSPF for IPv6).Identical parts between OSPFv3 and OSPFv2:■ 32 bits router ID and area ID■ Packets: Hello, DD (Data Description), LSR (Link State Request), LSU (Link StateUpdate), LSAck (Link State Acknowledgment)■ Mechanisms for finding neighbors and establishing adjacencies■ Mechanisms for LSA flooding and agingDifferences between OSPFv3 and OSPFv2:■ OSPFv3 now runs on a per-link basis, instead of on a per-IP-subnet basis.■ OSPFv3 supports multiple instances per link.■ OSPFv3 identifies neighbors by Router ID, while OSPFv2 by IP address.OSPFv3 Packets OSPFv3 has also five types of packets: hello, DD, LSR, LSU, and LSAck.The five packets have the same packet header, which different from the OSPFv2packet header is only 16 bytes in length, has no authentication field, but is addedwith an Instance ID field to support multi-instance per link.
