What are the advantages of TSPEC signaling in ArubaOS?

Aruba Employee
Aruba Employee

Product and Software: This article applies to all Aruba controllers and ArubaOS versions.

Traffic Specification (TSPEC) is defined only to carry the maximum packet size parameter (M) to avoid fragmentation. No other parameters are defined. Network nodes that receive these PATH messages interpret the service type to indicate that the application is requesting no specific service type or quantifiable resources. Instead, network nodes manage the traffic flow based on the requesting user, the requesting application, and the type of application sub-flow.


This mechanism offers significant advantages over a pure diffserv network. At the very least, it informs each network node that would be affected by the traffic flow (and which is interested in intercepting the signaling). This feature is applicable for all ArubaOS.


TSPEC in ArubaOS

A WMM client can send a TSPEC signaling request to the AP before sending traffic of a specific AC type, such as voice. You can configure the Mobility Controller so that the TSPEC signaling request from a client is ignored if the underlying voice call is not active; this feature is disabled by default.


If you enable this feature, you can also configure the number of seconds that a client must wait to start the call after sending the TSPEC request (the default is one second).


A Voice license must be installed on the controller.


You enable TSPEC signaling enforcement in the VoIP Call Admission Control profile.


Use the CLI to configure TSPEC signaling enforcement:

wlan voip-cac-profile <profile>


wmm-tspec-enforcement-period <seconds>


Use the WebUI to configure TSPEC signaling enforcement:

1) Navigate to the Configuration > AP Configuration page. Select either AP Group or AP Specific.

  • If you select AP Group, click Edit for the AP group name for which you want to configure TSPEC signaling enforcement.
  • If you select AP Specific, select the name of the AP for which you want to configure TSPEC signaling enforcement.

2) In the Profiles list, select QoS.

3) Select the VoIP Call Admission Control profile.

4) Scroll down to select the VoIP TSPEC Enforcement check box.

5) You can optionally change the VoIP TSPEC Enforcement Period value.

6) Click Apply.

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Last update:
‎07-05-2014 06:53 AM
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