(AVC) Is there Any way to prioritize traffic from wireless client (laptop in my case) to AP

Question

Is there any way to prioritize traffic from wireless client (laptop in my case) to AP …. if i explain the issue in a broad way there is no congestion going on in wired network. When multiple users connect to real presence and all share the same AP. they get real-time output over the call BUT if someone start file-transfer over the same AP the real presence call voice/video get stuck.
I applied the AVC feature on WLC but as i tested, i think prioritization from my laptop to AP will not happen and the situation remains same.
Please share if there is any way to prioritize traffic from wireless client (Laptop) to AP only ?

Answer 1

Hi Vinod,
Here is the AVC & QoS interaction for upstream & downstream traffic. For downstream it is important you have configured your WLAN with correct QoS profile & 802.1p values as that play a role even though you marking traffic using AVC.
Upstream1. Packet comes with or without inner DSCP from wireless side (wireless client).2. AP will add DSCP in the CAPWAP header that is configured on WLAN (QoS based config).3. WLC will remove CAPWAP header.4. AVC module on the controller will overwrite the DSCP to the configured marked value in the AVC profile and send it out.Downstream 1. Packet comes from switch with or without inner DSCP wired side value.2. AVC module will overwrite the inner DSCP value.3. Controller will compare WLAN QoS configuration (as per 802.1p value that is actually 802.11e) with inner DSCP value that NBAR had overwritten. WLC will choose the lesser value and put it into CAPWAP header for DSCP.4. WLC will send out the packet to AP with QoS WLAN setting on the outer CAPWAP and AVC inner DSCP setting.5. AP strips the CAPWAP header and sends the packet on air with AVC DSCP setting; if AVC was not applied to an application then that application will adopt the QoS setting of the WLAN.
I am not sure which controller software version you are running. From AVC perspective, it is good if you could install latest NBAR protocol pack (4.1 for WLC 7.5.x code or 6.3 for WLC 7.6.x code) on your controller.
Here is the 7.5.x AVC deployment guide which should help you on this
http://www.cisco.com/en/US/docs/wireless/controller/technotes/7.5/AVC_dg7point5.html
Like others mentioned, it is very little you can do with respect to upstream direction as AVC kicks in only when traffic hits WLC & not at the AP level.
HTH
Rasika
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