Lync ALG is an implementation of a full-fledged ALG for Microsoft Lync software. Microsoft Lync provides enterprise users with the ability to make voice and video calls to each other and also enables applications like ‘Desktop Sharing’ and ‘File Transfer’. The proposed ALG for Lync will allow Aruba to provide value-added services like QoS, Call Admission Control, Call Quality metrics and Prioritization for the various Lync applications. This solution also provides a dedicated visibility and debugging framework to fine-tune and troubleshoot Lync traffic flow on Aruba networks.
Feature Notes : Lync ALG feature is supported from AOS 6.3.
Environment : Microsoft Lync deployed by customer. Lync applications need to be prioritized are Voice, Video, file transfer and desktop sharing.
Network Topology : Lync clients <----> AP <--> Controller <----> Lync Server (with LNE plugin)
Configuration Steps :
Lync ALG has to be enabled globally in the firewall settings.(Abilash-Lab-Cont-master-6.4) (config) #no firewall disable-stateful-sips-processing(Abilash-Lab-Cont-master-6.4) (config) #show firewall | include SIPSStateful SIPS Processing Enabled(Abilash-Lab-Cont-master-6.4) (config) #web-server(Abilash-Lab-Cont-master-6.4) (Web Server Configuration) #?
(Abilash-Lab-Cont-master-6.4) (Web Server Configuration) #web-lync-listen-port http 15000WARNING: Disable 'classify-media' CLI in access-list for better performance.(Abilash-Lab-Cont-master-6.4) (Web Server Configuration) #exit
Once the applications get invoked, the Lync server shares the session-related information with the Lync Plugin, which, in turn, passes on this information to the controller through HTTP/ HTTPS based XML communication.
(Abilash-Lab-Cont-master-6.4) #show firewall | include StatefStateful SIP Processing EnabledStateful H.323 Processing EnabledStateful SCCP Processing EnabledStateful VOCERA Processing EnabledStateful UA Processing EnabledStateful SIPS Processing Enabled(Abilash-Lab-Cont-master-6.4) #
There are a set of troubleshooting commands that have been introduced for analysing LYNC issues.(Abilash-Lab-Cont-master-6.4) #show app lync ?
Also refer to Lync SDN API Configuration guide on Aruba web site which provides configuration best practices, step-by-step Lync specific configurations and additional troubleshooting details -
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