How a Parallel Upgrade Works

You do not have to migrate an existing r6.x environment to 12.51. Rather, you can configure a parallel 12.51 environment with an existing deployment.

The following figure illustrates a simple parallel upgrade and details:

An r6.x environment that continues to protect existing resources.
An r6.x Policy Server User Interface that is used to manage CA SiteMinder® objects in the r6.x policy store.
An 12.51 environment that protects new resources.
An 12.51 Administrative UI that is used to manage CA SiteMinder® objects in the 12.51 policy store.
A common r6.x key store. The common key store enables single sign-on between both environments.
Note: Although not illustrated, you can enable single sign–on between both environments using multiple key stores.