Concept Guide

show ha oversubscription statistics
show ha oversubscription statistics
Description
This command displays statistics for the High Availability extended controller capacity feature
Syntax
No parameters.
Usage Guidelines
Starting with ArubaOS 6.4.0.0, acontroller acting as a standby controller can oversubscribe to standby APs by
up to four times that controller's rated AP capacity, as long as the tunnels consumed the standby APs do not
exceed the maximum tunnel capacity for that standby controller.
Feature Requirements
All controllers using this feature must be deployed in a master-local topology where centralized licensing is
enabled on the active and standby controllers. If centralized licensing is disabled, the standby AP
oversubscription feature are disabled also. Standby controller oversubscription and the high availability state
synchronization features are mutually incompatible cannot be be enabled simultaneously. If your deployment
uses the state synchronization feature, you must disable it before you enable standby controller
oversubscription.
Standby Controller Capacity
The following table describes the AP oversubscription capacity maximum supported tunnels and for controllers
that support this feature.
Controller Model
Standby AP
Capacity
Maximum Tun-
nels Sup-
ported
W-7210 4x rated APcapacity 16384 tunnels
W-7220 4x rated APcapacity 32768 tunnels
W-7240 4x rated APcapacity 65536 tunnels
To determine the number of standby tunnels consumed by APs on each active controller, multiply the number
of APs on the active controllers by the number of BSSIDs per AP. As an example, consider a deployment with
four active W-7210controllers that each have 512 APs with 8 BSSIDs. The APs on each active controller
consume (512 * 8) tunnels, for a combined total of 16,384 tunnels. A single W-7210controller using the
standby controller oversubscription feature can act as the standby controller for all four active controllers in
this example, because this topology is within 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.
Dell Networking W-Series ArubaOS 6.5.x | Reference Guide show ha oversubscription statistics | 1512