ACS 5.x - different version between Primary and Secondary?

[rolandgentile]

This may be a stupid question, but can one register a secondary ACS running version 5.6 to a primary currently running 5.3 without issue?

[Karsten Iwen]

The ACS doesn't support interoperability between versions. You first have to upgrade your primary server to 5.6, then you join your secondary server.

[mohanak]

You can configure and deploy ACS instances so that one ACS instance becomes the primary instance and the other ACS instances can be registered to the primary as secondary instances. An ACS instance represents ACS software that runs on a network.

An ACS deployment may consist of a single instance, or multiple instances deployed in a distributed manner, where all instances in a system are managed centrally. All instances in a system will have an identical configuration.