CSM Load Balancer Help

[anthony.baker]

Hey,

Just a quick question....

Does anyone know a) if it's possible and b) how to have two servers off the CSM but instead of load-balancing between them make them a failover pair i.e. if server A goes down server B will take over - done using the same VIP?? It's needed because the application on the servers can't do load-balancing yet but can work in a failover way.

I'm reading the book trying to work it out but if someone has done this before that would be great!

Thanks

Anthony

[Jon Marshall]

Hi Anthony

You don't say which version of software you are running but one way to do this is to place each server into a different serverfarm and then use one of the serverfarms as the active serverfarm and the second serverfarm as the backup serverfarm.

Attached is a link to a configuration example for this.

http://www.cisco.com/en/US/docs/interfaces_modules/services_modules/csm/4.2.x/configuration/guide/cfgxpls.html#wp1008909

HTH

Jon

[anthony.baker]

Hey Jon,

Thanks for the response. I'm using CSM 4.6(6) and have given what you suggested a go but have run into problems.

When I disconnect the primary server I see that go out of service but that also knocks out the VIP and it never fails over to the second server. Am I missing something? I've attached the relevant parts of the config and would be greatful for any advice.

serverfarm FARM1

nat server

nat client WEB

real 10.2.250.10

inservice

probe HTTP

!

serverfarm FARM2

nat server

nat client WEB

real 10.2.250.11

inservice

probe HTTP

vserver WEBTRAFFIC

virtual 10.2.250.100 tcp www

vlan 250

serverfarm FARM1 backup FARM2

persistent rebalance

inservice

Cheers mate.

Anthony