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
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