Re-enabling OSPFv2 compatibility with RFC 1583

OSPFv2 is compatible with RFC 1583 and maintains a single best route to an autonomous system (AS) boundary router in the OSPF routing table. Disabling this compatibility causes the OSPF routing table to maintain multiple intra-AS paths, which helps prevent routing loops. You can re-enable OSPFv2 compatibility with RFC 1583 if it has been disabled.
  1. Enter the configure terminal command to access global configuration mode. 
    device# configure terminal
  2. Enter the ip router ospf command to enter OSPF router configuration mode and enable OSPFv2 on the device. 
    device(config)# router ospf
  3. Enter the rfc1583-compatibility command to re-enable OSPFv2 compatibility with RFC 1583. 
    device(config-ospf-router)# rfc1583-compatibility

The following example re-enables OSPFv2 compatibility with RFC 1583. 

device# configure terminal
device(config)# router ospf 
device(config-ospf-router)# rfc1583-compatibility
Parent topic: OSPFv2