From: Michael Permoda (mpermoda@hotmail.com)
Date: Tue Dec 02 2008 - 22:34:43 ARST
Lora,
Following up on what Vijay said below, if you could provide more details about
what you want to accomplish and the problems that you are having. I am in the
process of implementing a sticky server farm at the company I work for but
have not had any problems with it so far.
Thanks,
Mike P.
CCIE #22108> Date: Tue, 2 Dec 2008 15:39:31 +0000> From:
vijay.ramcharan@verizonbusiness.com> Subject: RE: ACE with sticky serverfarm>
To: lganeva@mobiltel.bg> CC: ccielab@groupstudy.com> > I don't believe that
you have defined your problem and the desired goal> appropriately. > > You
stated that you "need a fallback to default round robin in case> server
becomes unavailable". > > So one of your real servers fails which is a member
of a serverfarm.> Naturally since this is a sticky session I assume that you
have a reason> for it to be sticky (shopping cart for example). > Therefore
you may want to have the client/user reconnect to a different> real server and
start all over again with whatever they were doing when> the real server
failed. > In that case, I would look into the "failaction purge" command. > >
Options: > a) Purge existing connections going to that real server > b) Let
the LB make the decision which by your own admission appears to> be that it
sends the connections over to the next available server(s) > c) ...fill in
what other options may be applicable in your situation > > Really though, I
think you need to determine what the LB "should" do in> your server failure
scenario and then find the appropriate knobs to turn> to achieve the desired
goal. > > Vijay Ramcharan > > -----Original Message-----> From:
nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of> Lora
Ganeva> Sent: December 02, 2008 04:00> To: Thomas Fowles> Cc:
ccielab@groupstudy.com> Subject: RE: ACE with sticky serverfarm> > Hi Thomas,>
> > > Thanks a lot. I am pretty sure that my question will be not answer in>
the> official cisco site. I have configured the stickness, it is working but>
in an> unpredictable manner - when server fails, connections (that have to be>
sticky)> are for some reason forwarded to the next server in the serverfarm.>
> > > BR<> > Lora> > > > From: Thomas Fowles [mailto:tfowles@gmail.com]> Sent:
02 dEKEMWRI 2008 G. 02:53> To: Lora Ganeva> Cc: ccielab@groupstudy.com>
Subject: Re: ACE with sticky serverfarm> > > > This link might be helpful to
you:> >
http://www.cisco.com/en/US/docs/app_ntwk_services/data_center_app_servic>
es/ac> e_appliances/vA1_7_/configuration/slb/guide/classlb.html#wpxref39283> >
Basically, you configure two serverfarms, a primary and a backup. When> all>
servers in the primary are gone, you fail back to the sorry serverfarm,> and
it> looks like you can specify a different predictor (lb-algorithm) for each>
serverfarm if you wish (ie leastconn & round-robin). I'm not sure that> you>
can make the primary sticky and not the backup.> > HTH,> > Thomas Fowles>
CCIE#18762> > > > On Mon, Dec 1, 2008 at 6:28 AM, Lora Ganeva
<lganeva@mobiltel.bg> wrote:> > Hi experts,> > > > If anyone has in depth
experience with ACE please let me know. I am> facing a big problem with sticky
serverfarm that need a fallback to> default round robin in case server becomes
unavailable.> > > > 10x in advance,> > Lora> > > Blogs and organic groups at
http://www.ccie.net> >
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