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 |