While OSPFv3 was originally designed to carry only IPv6 routing information, the protocol has been extended to add support for other address families through work within the IETF (RFC 5838). These extensions within SR OS allow separate OSPFv3 instances to be used for IPv6 or IPv4 routing information.
To configure an OSPFv3 instance to distribute IPv4 routing information, a specific OSPFv3 instance must be configured using an instance ID within the range specified by the RFC. For unicast IPv4, the range is 64 to 95.
The following shows the basic configuration steps needed to create the OSPFv3 (ospf3) instance to carry IPv4 routing information. When the instance is created, the OSPFv3 instance can be configured as needed for the associated network areas, interfaces, and other protocol attributes as you would for OSPFv2.
Example:
config
router
ospf3 64 10.20.1.3