Suggestions and precautions for upgrading Virtual Load Balancer

11.5 to 11.6 is a relatively minor code upgrade and you shouldn't see any serious issues in terms of configuration incompatibility. However, it is good to remove any unused configuration elements like iRules or profiles that are not being utilized.

Save configuration & license on the box and off the box.

Perhaps you can take a look at the manual on software upgrade:

• Manual: BIG-IP Systems: Upgrading 11.x Software

Also, you may need to re-activate the license prior to version upgrade:

• K7727: License activation may be required prior to a software upgrade for the BIG-IP or Enterprise Manager system