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
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.
—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
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.