Netgear XCM8810 Chassis User Manual - Page 688

25. OSPFv3 25 This chapter includes the following sections: • Overview on page 688 • Route Redistribution on page 693 • OSPFv3 Configuration Example on page 694 Note: OSPFv3 is available on platforms with an Advanced Edge or Core license. See Appendix A, XCM8800 Software Licenses for information about OSPFv3 licensing. Overview Open Shortest Path First (OSPF) is a link state protocol that distributes routing information between routers belonging to a single IP domain; the IP domain is also known as an autonomous system (AS). In a link-state routing protocol, each router maintains a database describing the topology of the AS. Each participating router has an identical database for an area maintained from the perspective of that router. From the link state database (LSDB), each router constructs a tree of shortest paths, using itself as the root. The shortest path tree provides the route to each destination in the AS. When several equal-cost routes to a destination exist, traffic can be distributed among them. The cost of a route is described by a single metric. OSPFv3 supports IPv6, and uses commands only slightly modified from that used to support IPv4. OSPFv3 has retained the use of the 4-byte, dotted decimal numbers for router IDs, LSA IDs, and area IDs. OSPFv3 is an interior gateway protocol (IGP), as is the other common IGP for IPv6, RIPng. OSPFv3 and RIPng are compared in Chapter 23, RIPng. Chapter 25. OSPFv3 | 688