CSM-S connections under Redundancy

MARTIN FUNKE · ‎08-09-2005

We have installed two redundant Catalyst 6506E with CSM-S modules.

Now I can see that CSM-S #1 is active and CSM-S #2 is standby. Nevertheless I can see with "show mod csm 3 vserver" that there are a number of connections on the vservers on CSM-S #2, while there are no connections on the CSM-S #1.

Can anyone explain this behavior?

Thank you.

Martin Funke.

robert.breen.hbp2 · ‎08-09-2005

You probably have 'replicate csrp' configured on 1 or more Vservers. If that is true, the connections you are seeing are the result of session replication - i.e. the primary CSM telling the standby CSM what load balancing decisions he has made. In the event of a primary CSM failure, your standby CSM has all of the replicated sessions ready to go.

MARTIN FUNKE · ‎08-09-2005

Yes, I have configured 'replicate csrp'. But why do I not see the connections on the active CSM?

I would expect to see the same number of connections on both CSMs.

robert.breen.hbp2 · ‎08-09-2005

Hmm. What type of vservers are showing connections on the standby but not on the active? Are they Layer3 vserver, ICMP, UDP, etc? Do your vserver idle timers match on the active and standby configurations?

Gilles Dufour · ‎08-09-2005

Martin,

do you use predictor forward ?

Do you have connections open directly to the real server ?

Can we get a copy of your config and the 'sho mod csm X conn det' and 'sho mod csm x vser' on both standby and active CSM.

Thanks,

Gilles.

MARTIN FUNKE · ‎08-14-2005

May I send you the config and the requested show commands directly to you email-account? You can contact me under m.funke@itknetwork.com

Thank you.

Martin Funke.

Gilles Dufour · ‎08-15-2005

sure - gdufour@cisco.com