Fast hello OSPF support between 6500 and Nexus 7000

[graham.moore]

I am replacing our 6500's with Nexus 7000's and have come across a problem when trying to create an OSPF connection between the 6500 and Nexus 7000.

The layer 3 interfaces on the 6500 use OSPF fast hellos for faster failover, using the following:

ip ospf dead-interval minimal hello-multiplier 4

However, on the Nexus 7000 side, there is not an equivalent command, only:

ip ospf dead-interval 1

I cannot confiure the hello-multiplier on the Nexus 7000 OSPF neighbor and these two values need to match to establish the OSPF adjacency.

I do not want to change the 'ip ospf dead-interval minimal hello-multiplier 4' command on the 6500, as this is our exsiting configuration on our production network and it will make a simplier cutover to leave it.

So, what is the equivalent on the Nexus 7000 to 'ip ospf dead-interval minimal hello-multiplier 4'?

Regards,

Graham

[dominic.caron]

Hi,

I dont think it's supported. If you put anything more agressive than the default 10 seconds hello, Cisco will no longer support ISSU on your 7000. Also, a too agressive timer will detect a failure of the supervisor engine without giving the system time to switchover to the other one.