A Nokia CheckPoint Firewall was not receiving OSPF adjacency from a Cisco IOS 12.3 3640 Router. Apparently Cisco released a new feature in 12.3 (and 12.2T) that is ON by default... even though it is NEW. The feature is called, Link-Local Signalling (LLS). LLS confuses OSPF on the Nokia (even though it is RFC compliant) and is consequently rejected.

Cisco Command Reference

Cisco

Outline :

1. Add command statement to 12.3 router configuration.

• Add command statement...
  • Go to enable mode.
    • router1> enable
  • Go to configuration terminal
    • router1> config t
  • Enter the router ospf configuration
    • router1> router ospf 100
  • Disable capability for Link-Local Signalling (LLS)
    • router1> no capability lls
  • Exit from the configuration terminal
    • router1> end
  • Save the new configuration
    • router1> write mem