topic Hi Greg,No problem. Happy to in Application Networking

Cisco ACE back up real server failover

lwlim8888 — Sun, 25 May 2014 12:51:16 GMT

Hi,

I'd like to find out if its possible with this scenario. When a real server had failed, and the assigned backup-server is then serving the traffic, but when the failed real server came back online, I want the backup server to continue serving traffic and not the recovered real server.

I have not found a way to achieve this and want to confirm it's possibility.

Thank you

Hi,This is the default

Kanwaljeet Singh — Sun, 25 May 2014 15:28:44 GMT

Hi,

This is the default behavior. The existing connections will continue with the backup server and only "NEW" connections would be sent to the other real which has come back "operational". If you don't want any connections at all on the "operational" real server, then there is no way possible. You will have to make changes manually.

Regards,

Kanwal

Hi Kanwal, Thank you for your

lwlim8888 — Mon, 26 May 2014 01:58:38 GMT

Hi Kanwal,

Thank you for your reply.

Actually I want the back up real server to continue serving for new and existing traffic, and not the real server that have recovered from failure. Is this possible?

Regards

Hi,It's possible but manual

Kanwaljeet Singh — Mon, 26 May 2014 02:13:29 GMT

Hi,

It's possible but manual intervention is required. So when real server goes down and backup takes over, you can make the down server as the backup one and this backup one as the regular one. But if you leave everything as it is, then as per the default behavior(which cannot be changed), the backup server will server the traffic as long as regular real is down, once that comes up, new connections would be sent to it and existing connections would be continued to be served by backup real.

Regards,

Kanwal

Hi Kanwal,Thank you again for

lwlim8888 — Mon, 26 May 2014 02:21:38 GMT

Hi Kanwal,

Thank you again for your reply, that cleared my doubt.

Regards

There's a limit of 3 chained

axfalk — Tue, 27 May 2014 18:49:12 GMT

There's a limit of 3 chained backup servers in A5(1.0) and I can't find any documentation on the limit on the number of chained backup servers in A5(2.1), which is what we're running.

Does anyone happen to know what that limit is?

thanks.

Greg

Hi Greg,The limit should be

Kanwaljeet Singh — Tue, 27 May 2014 19:26:05 GMT

Hi Greg,

The limit should be same. If nothing is reflected in release notes regarding the change, then it should be same.

Regards,

Kanwal

Thanks for the response. We

axfalk — Tue, 27 May 2014 20:26:29 GMT

Thanks for the response. We have only one backup server that we're planning on using in conjunction with the 3 rservers that are currently part of the serverfarm, as per the following:

serverfarm host SV

predictor leastconns

probe SERVER_80

rserver SERVER01 80

backup-rserver BACKUP

inservice

rserver SERVER02 80

backup-rserver BACKUP

inservice

rserver SERVER03 80

backup-rserver BACKUP

inservice

rserver SERVER04 80

backup-rserver BACKUP

inservice

rserver backup-rserver BACKUP

inservice standby

Does the 3 backup server limit apply to this as well?

thanks again..

_ Greg

Hi Greg,serverfarm host R1

Kanwaljeet Singh — Tue, 27 May 2014 20:42:53 GMT

Hi Greg,

serverfarm host R1
rserver R1
    backup-rserver R1B
rserver R1B
    inservice standby
rserver R2
    backup-rserver R1B
    inservice
rserver R3
    backup-rserver R1B
    inservice
rserver R4
    backup-rserver R1B
    inservice
rserver R5
    backup-rserver R1B
    inservice

It doesn't seem that limit applies the way you want to configure. As you can see above i added the same rserver as backup rserver for more than 3 reals. So the limit should be not more than 3 DIFFERENT BACKUP rservers.

Regards,

Kanwal

appreciate the response..

axfalk — Tue, 27 May 2014 21:03:56 GMT

appreciate the response...thnx a lot...

Greg

Hi Greg,No problem. Happy to

Kanwaljeet Singh — Wed, 28 May 2014 12:38:23 GMT

Hi Greg,

No problem. Happy to help!

Regards,

Kanwal