Non-WMM traffic doesn't have a UP value (which you all know.) That means that it comes in on the default queue on the AP radio. The default queue gets mapped to DSCP 0 at the wired side of the AP (even for 7920 phone.)
When going from the wired side, the traffic follows whatever L2/L3 markings have been assigned (if it was EF, it it will remain EF, depending on the 802.1p settings of the QoS Profile) until it gets to the AP. At the AP, since it is a non-WMM device, it will be mapped to the default queue, without a UP value. Hope that clears things up (a bit.) Jason Boyers - CCIE #26024 (Wireless) Technical Instructor - IPexpert, Inc. Mailto: *[email protected]* On Thu, Mar 10, 2011 at 3:02 AM, Phil Priest <[email protected]> wrote: > Alvin, > > I had the same query, and I am still somewhat unclear on the answer. > > If WMM traffic comes into the AP from the client with a UP value of 6 or > 7 and CAC and you have voice CAC enabled in Platimum, then it would be > mapped to CoS value of 5 based on the 802.1p value specified in the > platinum class. > Any WMM traffic coming in with a value of 6 or 7 without CAC would not > be accepted as CAC is mandatory on the voice class. Any WMM traffic > coming in with 4 or 5 without CAC would be accepted as there is no CAC > on the video class. > I am unclear however what would happen with a "non WMM" client as stated > in the question, as I understood that if its non WMM it would not come > in with a UP value. What happens to traffic that comes in without any UP > value, is it mapped to 0?? Or does it take the value of the class > defined on the controller profile?? > > Regards > > Phil > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > [email protected] > Sent: 10 March 2011 04:46 > To: [email protected] > Subject: [CCIE Wireless] 5.6 - WLC Qos > > Hi all, > > The 2nd portion of the question where ssid Guest2 is to allow WMM and > non-WMM devices to connect. If a non-WMM device connects, it should not > be able to use greater than AC Video. (not sure what this really means. > quite vague) The DSG shows, the Guest2 WLAN to be configured with the > platinum profile with dot1p of 6 (default). Correct me if I'm wrong, but > if a non-WMM client gets associated with that WLAN, won't the LWAP > upstream packet (to WLC)be mapped with DSCP associated with the QoS > profile which is EF? Then later down the chain, the cos of the client's > outgoing traffic from the WLC to LAN will be given a COS of 5? > > OR, is this question talking about the different wireless > queueing/contention mechanism related to WMM and the 4 ACs, where > non-wmm will be subjected to DCF instead of EDCF? > > Any input is greatly appreciated. > > Alvin B. > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, > please visit www.ipexpert.com >
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