OSPFv3 which is covered in RFC 5340 is a IPv6 link-state interior routing protocol which originates from OSPFv2. OSPFv3 is not backward compatible with OSPFv2 which supports only IPv4 addressing.
General information
OSPFv2 - protocol number 89, all routers multicast 224.0.0.5, DRs multicast on 224.0.06
OSPFv3 - next header value 89, all routers multicast FF02::5, DRs multicast on FF02::6
Here are few things in common:
- both utilise Shortest Path First algorithm
- five messages types: Hello, Database Description, LSDR, LSDU, LSAck
- link-state advertisement
- flooding
- DR election
- areas
- timers and metrics are also the same
Differences between OSPFv2 and OSPFv3:
- changes in LSAs
- OSPFv3 utilise per link processing (per subnet), OSPFv2 per interface processing
- in OSPFv3 all neighbours are identified by Router ID whereas in OSPFv2 on Broadcast networks and NBMA links neighbours are identified by interface ID.
- OSPFv3 adds link-local flooding scope
- OSPFv3 use link-local addresses as a source and destination.
Monday, 9 March 2020
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