If it is a WMM device (and WMM is Allowed or Required on the SSID,) then the SSID will use the values as mentioned by Phil. By default, Windows (XP, Vista, Win7) does not set DSCP or ToS values, and does not set the corresponding 802.11e UP values. So, in that case, IPC traffic would all be 0. If it is configured to do be able to mark those values (DSCP gets mapped to UP on the basis of the 3 most significant digits - i.e. DSCP AF41 -> UP 4, DSCP EF -> UP 5,) then the wired side DSCP comes into play. There are a lot of factors that come into play with this.
I would actually recommend looking at using H-REAP if the IPC VLAN can be locally switched. You could do more granular QoS policies on the wired side for each VLAN in that case. And, note that H-REAP will mark both CoS and DSCP values. Jason Boyers - CCIE #26024 (Wireless) Technical Instructor - IPexpert, Inc. Mailto: *[email protected] * On Wed, Mar 23, 2011 at 11:20 AM, Phil Priest <[email protected]>wrote: > Hello Brian, > > > > That’s a good question. Upstream wireless QoS on an LWAPP AP uses the > 802.11e UP value and the QoS profile defined to calculate the LWAPP DSCP > value, the actual IP packet DSCP value does not come into play really and > will depend on your switch cos-dscp maps as we trust CoS on the WLC > interface. > > Does the softphone set a 802.11e UP value for its traffic?? I guess there > is nothing to stop Windows setting any 802.11e UP value. > > > > Regards > > > > Phil > > > > > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Brian Schultz > *Sent:* 23 March 2011 14:39 > *To:* [email protected] > *Subject:* [CCIE Wireless] QoS for SoftPhone behind LAP > > > > I've read through some of the recent posts regarding best practices for QoS > configurations in wireless environments. One area I am not clear on is if > there is a best practice to prioritize softphone (CIPC) traffic over a > wireless connection. In the QoS SRND, there is a section for an untrusted > PC + SoftPhone with Scavenger-Class QoS Model where you utilize a > service-policy to police softphone traffic. But there isn't a separate > section differentiating when this same traffic is connected via a wireless > access point. > > For a LAP connection, we would typically use 'mls qos trust dscp' on the > switchport. But with this configured, is it possible that we are trusting > all markings from a wireless connected laptop, even if the nic has > deliberately or inadvertently changed it's markings? > > Thanks, > Brian > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > >
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