OSPFv2 and OSPFv3 comparison
The following table examines details of the OSPF routing protocol by comparing OSPFv2 and OSPFv3:
| OSPFv2 | OSPFv3 |
|---|---|
| OSPFv2 supports only IPv4 | Supports both IPv4 and IPv6 |
| Header size 24 bytes. | Header size of 16 bytes. |
| Uses seven types of LSAs | Uses nine types of LSAs |
| Only one instance of OSPF can function per link | OSPFv3 instance IDs allow for multiple OSPF instances per link, as well as multiple address families |
| No link-local flooding scope | Addition of a link-local flooding scope for IPv6 |
| Operates on subnets rather than links | Operates on links rather than subnets |
| Needs network mask for adjacency formation | Doesn’t need network mask for adjacency formation |
| MD5 Hashing is used for Authentication | IPSec is used for Authentication |
| Nodes from different subnets can’t communicate | Nodes from different subnets can communicate |
The network command is used to specify participating subnets and interfaces | Interface commands are used to enable routing and neighbor adjacencies |