Forum Discussion

Stefan_Klotz_85's avatar
Stefan_Klotz_85
Icon for Cirrus rankCirrus
Dec 11, 2014

Standby LB becomes Active during HA software update

Normally a software update within the same major release and especially just a Hotfix update is a very easy and less critical task without any downtime. We are using the following steps:   relice...
application delivery
LTM
JG's avatar
JG
Icon for Cumulonimbus rankCumulonimbus
Dec 16, 2014

With v11.*, force-offline the standby device before applying a hotfix release to it. The offline state will then persist across reboot. I have tried this.

 

With v10.*, I remember F5 recommends to start the upgrade with the device with the numerically highest mgmt IP address before applying a hotfix release. I'd unplug the network of the data plane if I was not sure - especially in a major upgrade when I might have to rebuild device trust.

 

With v11., the device with the highest mgmt address will be automatically selected as the active device, if the standby device does not have the persistent force-offline state carried across reboot. This behavior is totally different from v10..