ISE posture agent using CallHomeList in multi-cluster env

[clandrai]

Dear community,

This is an organisation with 3 separate ISE clusters where users travel between locations, posture agents will rely upon the CallHomeList in the ISEpostureCFG.XML profile for the Policy Server Discovery (because some sites don't support URL redirection)..

If CallHomeList includes PSNs from all 3 clusters in order to have a single posture XML file globally, what would be the impact?  How would the solution behave when a discovery request is sent towards a PSN of another cluster that doesn't have the session?

Side-question: what's the maximum size of the CallHomeList field in ISEpostureCFG.xml?

Thanks!

Cheers,

Chris

[hslai]

See Probe 1 Step 14 @ ISE Posture Style Comparison for Pre and Post 2.2

The data type of CallHomeList is String so potentially of length 2^31 - 1. I am able to put a text string > 700 characters.