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Not sure how controller manages Campus AP?
For data traffic AP establish s x SSID tunnels + 1 tunnel for keepalives.
Is there a PAPI session between AP and Controller?How AP detect that the controller is unreachable?
PAPI or GRE Keepalives ???
http://community.arubanetworks.com/t5/Controller-Based-WLANs/What-is-the-purpose-of-configurable-AP-heartbeat-Outline-the/ta-p/187214
Thanks CJ.
So, these heartbeats are encapsulated over GRE tunnel?