OSPFv三RoutingProtocol文件材料.ppt

Cisco Network Academy. All rights reserved.. CCNP+ BSCI v3.0 Cisco Network Academy. All rights reserved.. CCNP+ BSCI v3.0 Implementing IPv6 OSPFv3 Routing Protocols IPv6 Routing Protocols IPv6 routing types Static RIPng (RFC 2080) OSPFv3 (RFC 2740) IS-IS for IPv6 MP-BGP4 (RFC 2545/2858) EIGRP for IPv6 The ipv6 unicast-routing command is required to enable IPv6 before any routing protocol configured. OSPFv3—Similarities with OSPFv2 Neighbor discovery and adjacency formation mechanism are identical. RFC-compliant NBMA and point-to-multipoint topology modes are supported. Also supports other modes from Cisco, such as point-to-point and broadcast, including the interface. LSA flooding and aging mechanisms are identical. Enhanced Routing Protocol SupportDifferences from OSPFv2 OSPF packet type OSPFv3 has the same five packet types, but some fields have been changed. All OSPFv3 packets have a 16-byte header vs. the 24-byte header in OSPFv2. OSPFv3 Differences from OSPFv2 OSPFv3 protocol processing is per link, not per subnet IPv6 connects interfaces to links. Multiple IPv6 subnets can be assigned to a single link. Two nodes can talk directly over a single link, even though they do not share a common subnet. The terms “network” and “subnet” are being replaced with “link.” An OSPF interface now connects to a link instead of to a subnet. OSPFv3 Differences from OSPFv2 (Cont.) Multiple OSPFv3 protocol instances can now run over a single link This structure allows separate autonomous systems, each running OSPF, to use a common link. A single link could belong to multiple areas. Instance ID is a new field that is used to allow multiple