Table of Contents


OSPFv3 provides support for the OSPF routing protocol within an IPv6 network. As such, it provides support for IPv6 addresses and prefixes. It retains most of the structure and functions in OSPFv2 (for IPv4) with some minor changes. The following are some of the additions and changes to OSPFv3:
  • Support for multiple instances per link
    —With OSPFv3, you can run multiple instances of the OSPF protocol over a single link. This is accomplished by assigning an OSPFv3 instance ID number. An interface that is assigned to an instance ID drops packets that contain a different ID.
  • Protocol Processing Per-link
    —OSPFv3 operates per-link instead of per-IP-subnet as on OSPFv2.
  • Changes to Addressing
    —IPv6 addresses are not present in OSPFv3 packets, except for LSA payloads within link state update packets. Neighboring routers are identified by the Router ID.
  • Authentication Changes
    —OSPFv3 doesn't include any authentication capabilities. Configuring OSPFv3 on a firewall requires an authentication profile that specifies Encapsulating Security Payload (ESP) or IPv6 Authentication Header (AH).The re-keying procedure specified in RFC 4552 is not supported in this release.
  • Support for multiple instances per-link
    —Each instance corresponds to an instance ID contained in the OSPFv3 packet header.
  • New LSA Types
    —OSPFv3 supports two new LSA types: Link LSA and Intra Area Prefix LSA.
All additional changes are described in detail in RFC 5340.

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