WIFITECHBLOG

It has been difficult for me to locate good QoS references in the past...  So at some point, I put together the following cheat sheet which will hopefully help others as well.  It's based on my interpretation of the current Cisco best practices, and since I do not work directly for Cisco - it's a bit of conjecture on my part.  Still, it seems to line up well and has not yet steered me wrong.

So, without further ado:

Cisco AVVID 802.1p UP-Based Traffic Type	Cisco AVVID IP DSCP	Cisco AVVID 802.1p UP	IEEE 802.11e UP (WMM AC)	Notes
Network Control	-	7	-	Reserved for network control only
Inter-Network Control	54	6	7 (AC_VO)	CAPWAP control WLC: Platinum QoS profile
Voice	46 (EF)	5	6 (AC_VO)	WLC: Platinum QoS profile
Video	32 (CS4)	4	5 (AC_VI)	WLC: Gold QoS profile
Voice Control	24 (CS3)	3	4 (AC_VI)	WLC: Gold QoS profile
Best Effort	0 (BE)	0	3 (AC_BE)	WLC: Silver QoS profile
			0 (AC_BE)
Background (Cisco AVVID Gold Background)	16 (CS2)	2	2 (AC_BK)	WLC: Bronze QoS profile
Background (Cisco AVVID Silver Background)	8 (CS1)	1	1 (AC_BK)	WLC: Bronze QoS profile

There are a number of settings one must configure via CLI to get voice QoS working on an AAP.  This is my attempt at putting all of them in a single post...  I can already see the edits coming:

!
dot11 ssid
 admit traffic
//Enables call admission control on the SSID.
!
dot11 arp-cache optional
//Best practices.  Reduces WLAN overhead by allowing AP to respond to ARP for known clients
dot11 priority-map avvid
//Forces the AP to translate from 802.11e to 802.1p
dot11 phone [dot11e]
//Configures the QBSS IE for 7920 or 802.11e (i.e. 7921, etc)
!
!
interface Dot11Radio0
 ssid
 !
 speed basic-12.0 18.0 24.0
//Best practice datarates for 802.11a/g/n; for 802.11b use basic-11.0
 dot11 qos class voice local
    admission-control
    admit-traffic narrowband max-channel 70 roam-channel 6
//sets AP CAC to allow 64% of bandwidth to voice + 6% roaming = 70%
 !
 dot11 qos class voice cell
    admission-control
//Allows the AP to factor in client QBSS readings for CAC
!
!
class-map voice
 match ip dscp ef
class-map video
 match ip dscp cs4
class-map voicecontrol
 match ip dscp cs3
//Create class maps to identify traffic
!
policy-map QoS
 class voice
  set cos 6
 class video
  set cos 5
 class voicecontrol
  set cos 4
//Create a policy map to tag traffic
!
int d0.20
 service-policy input QoS
 servicy-policy output QoS
//Tag the traffic as it traverses your wireless interface
!
int f0.20
 service-policy input QoS
 service-policy output QoS
//Tag the traffic as it traverses your wired interface
!

It is important to ensure that your traffic is tagged on both the wired and wireless interfaces because the traffic could be coming off another SSID on the AP (int d0.10 for example).
I guess that's about it.  Not nearly as daunting when you get them all down in one place ;)