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I have some WAPs bilding their GRE tunnels to the wrong controller. Where should I start troubleshooting?
Also, is VRRP still used in the newer controllers or has that been upgraded/replaced?
The controller APs terminate on is defined in the AP System Profile that is assigned to the AP Group that the AP belongs to. Start here and see what IP is defined.
For redundancy, you can still use VRRP; or you can use the newer fast failover redundancy features. Refererence the following for details:
http://www.arubanetworks.com/techdocs/ArubaOS_6.4.4.x_WebHelp/Web_Help_Index.htm#ArubaFrameStyles/VRRP/HighAvOverView.htm