Aruba Central licenses switches in different classes from the Aruba switch portfolio. Here is the current class mapping for each switch type:

The deadline for support on ClearPass 6.9.x and 6.10.x is coming up in May - 31st May 2024 to be precise. Many people are looking at their options for upgrade and may be confused. 

Part of the confusion comes from the need to install ClearPass as a new appliance. The operating system underlying the ClearPass platform is changing from 6.11 onwards and requires a fresh appliance install rather than an upgrade as many ClearPass administrators are used to. There has been plenty of warning of this change but now there is less than a month to complete the task while remaining supported. 

Another confusion occurs if you are looking at the Software Updates dashboard within ClearPass Policy Manager. In my virtual appliance running 6.10.8 I can see an "Upgrade" for 6.12.0 with the option to download. 

You won't receive a warning about not being able to upgrade from a version below 6.11.x until you have downloaded this upgrade and clicked install.

Even then the option to proceed is presented in this popup. Don't bother.

ClearPass Policy Manager backups containing configuration data from the following versions can be restored in 6.11:

• Any 6.10.x version (6.10.0 through the latest 6.10 cumulative patch update)
• Latest cumulative patch update in the 6.9.x release train (for example, at the time of the 6.11.0 release, 6.9.12)

If you will be moving to ClearPass 6.11 from a version that is older than the latest 6.9.x patch, you will first need to follow the appropriate upgrade and update paths to bring it to one of the above versions. See the "Upgrade and Update Information" chapter in the latest Release Notes for your ClearPass version.

Direct upgrades to 6.12.0 are only supported from 6.11.x or any hotfix applied to it, with some caveats noted here: 
https://www.arubanetworks.com/techdocs/ClearPass/6.12/Installation-Guide/Content/UpgradeUpdate/Up-VersionConsiderations.htm