topic Re: ACE 4710 Long Timeout in Application Networking

ACE 4710 Long Timeout

magordon — Wed, 12 Jan 2011 18:36:53 GMT

I have a redundant set of ACE4710's and if a user is connected to a particular host behind the LB's and I take that host manually out of service via the LB the client is unable to reconnect to one of the oter servers serving the same application for some time (approx 2-5 minutes). Is there a way to expidite this so as soon as a host is taken online the other hosts will take up future connections from the client?

Thank you in advance,

Matt

Re: ACE 4710 Long Timeout

Dan-Ciprian Cicioiu — Wed, 12 Jan 2011 18:42:14 GMT

Hi Matt,

If you use the sticky connection , and you do not set a action when a rserver fails you have a problem.

If your case is the one described by me , then the solution is setting on serverfarm config : failaction purge.

Dan

Re: ACE 4710 Long Timeout

magordon — Wed, 12 Jan 2011 19:01:50 GMT

Dan,

I am using sticky connections, and I do have "failaction purge" set. It still seems to take a bit before the client can reconnect...

I attached the config for that context, slightly modified for some security purposes...

Thank you,

Matt

Re: ACE 4710 Long Timeout

Dan-Ciprian Cicioiu — Wed, 12 Jan 2011 19:31:59 GMT

Matt ,

Correct me if i am wrong : the problem is that when you switch a rserver to outofservice, the client(s) connected to this rserver cannot connect for 2-3 minutes?

Are stoping the application on that server or do you gracefull shutdown from the ace ?

After taking the rserver outofservice can you check the sticky connections : sh sticky database rserver $rserver $port serverfarm $server-farm

Also can you see any connection to the server : sh conn rserver $rserver?

Dan

Re: ACE 4710 Long Timeout

Dan-Ciprian Cicioiu — Wed, 12 Jan 2011 20:01:59 GMT

Also ,

From : http://www.cisco.com/en/US/docs/interfaces_modules/services_modules/ace/v3.00_A1/configuration/slb/guide/rsfarms.html#wp999576

The no inservice command instructs the ACE to do the following:

•Tear down existing non-TCP connections to the server

•Allow existing TCP connections to complete before taking the server out of service

•Disallow any new connections to the server

Dan

Re: ACE 4710 Long Timeout

magordon — Fri, 21 Jan 2011 20:56:23 GMT

Dan,

I see no entries in the sticky database. I am using the ACE to set a client side session cookie, which I can see in the browser, but it does not log an entry in the sticky table... I see approperate connetions when I do a sho conn though...

Thank you for your help so far,

Matt