Dell W-7010 AOS 6.4.x CLI Reference Guide - Page 1503

this example, because this topology is within the the 4x rated AP capacity limit and maximum tunnel limit for the a W-7210 controller model. If the network administrator later changed all the APs in this deployment to support 10 BSSIDs, each active controller would use (512 * 10) tunnels, for a combined total of 20,480 tunnels on the four active controllers. The tunnels required by the APs on the active controllers would then exceed the maximum tunnel limit for the standby controller, so the standby controller can no longer support all APs on the active controllers. AP Failover If a standby controller reaches its AP oversubscription capacity or exceeds its maximum BSSID limit, the standby controller drops any subsequent standby AP connections. A dropped AP attempts to reconnect to the standby controller, but after it exceeds the maximum number of request retries, the AP informs the active controller that it is unable to connect to the standby controller. The active controller then prompts the AP to create a standby tunnel to another standby controller, if one is configured. If an active controller fails, the APs on the active controller fail over to the standby controller. Once the standby controller has reached its capacity for active APs,it terminates tunnels to any standby APs that controller can no longer serve. When these APs detect that there is no longer a heartbeat between the AP and the standby controller, they notify their active controller that they can no longer connect to the standby. The active controller then prompts the APs to establish standby tunnels to another standby controller, if one is configured. Examples The following command displays oversubscription statistics for APs and tunnels (host) #show ha oversubscription statistics Platform oversubscription factor : 4 APs Limits APs Number ---- ------ Platform Limit 512 Current Active 2 Current Standby 694 Active remaining 0 Standby remaining 1 Maximum allowed Standby 697 BSS Limits Tunnels ------Maximum BSS tunnels Average BSS/AP BSS tunnels in use BSS tunnels available Limits -----16384 23 16360 24 The output of this command includes the following parameters: Parameter Platform limit Current Active Current Standby Description Maximum number of APs supported by the controller platform. Number of active APs currently associated to the controller. Number of APs that are currently using the controller as a standby controller. 1503 | show ha oversubscription statistics Dell Networking W-Series ArubaOS 6.4.x | User Guide