OSPFv2 vs OSPFv3

Difference between OSPFv2 and OSPFv3

Below table summarizes the differences between OSPFv2 and OSPFv3:

PARAMETER	OSPFv2	OSPFv3
Routed Protocol Support	IPV4	IPV6
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	No	Yes
Authentication	Plain text and MD5	IPv6 authentication
Subnets	•Runs on subnets •Nodes from different subnets can’t communicate	•Runs on links not subnets •Nodes from different subnets can communicate
IP Unicast Routing	IPv4 unicast Routing is enabled by default	IPv6 unicast Routing is not enabled by default. “IPv6 Unicast-routing” global configuration command must be configured.
Flooding Scope	No flooding scope	Flooding scope is present
Header Size	24 Bytes	16 Bytes
LSAs	7	9
Interface ID	IPv4 Address	Link Local Address
Instances per Link	1	Multiple
Source: ipwithease.com