Technical data

More QoS Rule Examples

Configuring Call Admission Control and Load Balancing with the CLI

To help shape a global Quality of Service for calls and traffic, Call Admission Control

(CAC) and client load balancing can be set per AP or BSSID.

CAC commands can set threshold levels for the number of new SIP connections (calls)

that can exist per AP or BSSID to ensure a global amount of bandwidth is available.

The result is that existing calls maintain a consistent level of service, even if new

calls have to be temporarily denied. When CAC is enabled, as the set call level

threshold is neared for the AP or BSSID, the admin can configure actions to occur such

as having the system send a 486_BusyHere response, a modified INVITE message to

the ipPathfinder, or alternatively, sending a 802.11 De-authentication message the

originator of the call. If an existing call moves to another AP without sufficient band-

width, the call is classified as Pending/Best-effort until the needed resources are

available.

Enabling client load balancing implements round-robin load balancing of client asso-

ciations for an AP or BSSID. When the maximum number of stations are associated,

new stations are allowed to join in a round-robin fashion.

The following commands enable CAC and limits the number of calls per AP to 12:

controller (config)# qosvars cac-deauth on

controller (config)# qosvars calls-per-ap 12

The following commands enable client load balancing overflow protection and sets

the maximum number of stations per AP to 15:

controller (config)# qosvars load-balance-overflow on

controller (config)# qosvars max-stations-per-ap 15

The following commands limits the number of calls per BSSID to 14 and sets the

maximum number of stations per BSSID to 30:

controller (config)# qosvars calls-per-bssid 14

controller (config)# qosvars max-stations-per-bssid 30

Note:

A unique CAC value can be configured for an ESSID, that affects only

only that ESSID. Setting CAC at the ESSID level takes precedence over the

global settings described in this section. To configure CAC for an ESSID, see

“Configuring CAC for an ESSID AP with the CLI” on page 60.