Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

Gustavo_Lazarte's avatar
Gustavo_Lazarte
Icon for Nimbostratus rankNimbostratus
Sep 08, 2009

Load balancer bigip fail

Hello,     earlier we tried to remove our primary BIG-IP 9.1.2 Build 40.6 to replace falied fans. We failed to the backup F5 and the sites were up and running. As soon as we turned off the...
config
design
hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Sep 08, 2009
I'm guessing you'll need to open a case with F5 Support and give them full details of your network architecture and configuration. They'll probably ask for more information on why you thought the backup F5 seemed to be in standby. I don't think there is a way to keep a unit in standby if its peer unit is either powered off or not active.

 

 

Aaron