Some strange behavior on the F5 when one pool member is down

I assume your question is regarding LTM, correct? Which version? What is the status shape and color of the offline pool member?

What did you expect to happen?

When you connect to the virtual server it will send you to a server and possibly use persistence to keep you on that server. If that server goes down then it will send you to a different server. Obviously, health monitors take a period of time to detect issues but these can be modified depending on your required reaction time.

Can you post the config of your health monitor? I would guess the problem is the monitor is incorrectly configured. You should have a receive string configured in the monitor (something like 200 OK) if you want to mark the pool member down based on a 404 response. If the receive string is blank, any server response will result in the pool member being marked up, essentially the same as a tcp monitor.

Thanks guys for your reply. Here is the health monitor configuration: ltm monitor tcp /Common/TCP { defaults-from /Common/tcp destination : interval 15 ip-dscp 0 time-until-up 30 timeout 46 }

11.5.1 Build 5.0.147 - LTM version

Please correct me if anything is wrong with the configuration.

Thanks,
Thiyagu

Thanks a lot Guys for your reply.

Regards, Thiyagu