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Differences between OSPFv3 and OSPFv2

The version of OSPF for IPv6 is OSPFv3. The previous version of OSPF which supports IPv4 is OSPFv2. OSPFv3 is based on OSPFv2. Following table lists the main differences between OSPFv2 and OSPFv3.

Protocol Feature OSPFv2 OSPFv3
Distance Vector / Link State Link State Link State
Routed Protocol Supported IPv4 IPv6
VLSM Support Yes Yes
Router ID 32 bit Binary ID 32 bit Binary ID
Metric Value Cost (Based on Bandwidth) Cost (Based on Bandwidth)
How DR and BDR are elected Based on highest priority value and then highest RID
Based on highest priority value and then highest RID
OSPF multicast all routers IP address 224.0.0.5 FF02::5
OSPF DR and BDR multicast IP address 224.0.0.6 FF02::6
Support for multiple OSPF instances per interface
Not available Available
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