Cisco 6509 Supervisor failover - How long?

[jonathanaxford]

Hi All,

Just a quick question...

How long would you expect a failover from one Supervisor card to the Slave supervisor card to take?

We have a Cisco 6509 with the following:

5 2 Supervisor Engine 720 (Active) WS-SUP720-3B

6 2 Supervisor Engine 720 (Hot) WS-SUP720-3B

When the Active card was 'pulled' by an engineer, the switch rebooted and took a good 5 minutes or so to come back online.

I would have expected a much quicker failover myself...

Anything we need to check or are missing?

Many thanks

Jonathan

[jonathanaxford]

Hi,

By the looks of it, the 6509 is not configured for NSF. I will get this implemented before we run the test again to see if it has an effect.

Many thanks

[paul.matthews]

Don't forget to make sure you look at the neighboring routers...

I would be tempted to plan the NSF config, but do a test first to try to see where delays are.

SSO should be sub second, but thene there are potential SPT issues, and then OSPF itself.

I always like to know *why* something did not work, instead of just seeing it go away IYSWIM...

P.

[jonathanaxford]

Definately, I will get to the bottom of this. I also like to ensure that i understand everything so it can't bite me again next time!

I will schedule in NSF config, and also plan for the next down time and failover of the cards so i can make some exact timings and see what is going on.

Thanks for all your help on this one.

Cheers

Jonathan