Qos Basic Service Set (Qbss); Wired Qos - Cisco 8861 Deployment Manual

Without proper classification, voice packets will be treated as best effort, which will defeat the purpose of TSPEC and QoS in
general.
TCP and UDP port information will be used to set the UP (User Priority) value.
The previous method of classification depends upon preservation of DSCP value throughout the network, where the DSCP
value maps to a particular queue (BE, BK, VI, VO).
However, the DSCP values are not always preserved as this can be viewed as a security risk.
Using port based QoS policies is inadequate for CAPWAP based wireless LAN solutions as all data packets use the same UDP
port (CAPWAP = UDP 5246) and the access point uses the outside QoS marking to determine which queue the packets should
be placed in.
With TCLAS, DSCP preservation is not a requirement.
Call Admission Control must be enabled on the access point in order to enable TCLAS.
TCLAS will be negotiated within the ADDTS packets, which are used to request bandwidth in order to place or receive a call.

QoS Basic Service Set (QBSS)

There are three different versions of QoS Basic Service Set (QBSS) that the Cisco IP Phone 8861 and 8865 support.
The first version from Cisco was on a 0-100 scale and was not based on clear channel assessment (CCA), so it does not account
for channel utilization, but only the 802.11 traffic traversing that individual access point's radio. So it does not account for
other 802.11 energy or interferers using the same frequencies.
QBSS is also a part of 802.11e, which is on a 0-255 scale and is CCA based. So this gives a true representation on how busy
the channel is. The max threshold is also defined on the client side, which is set to 105.
The second version from Cisco is based on the 802.11e version, but allows the default max threshold of 105 to be optionally
configured.
Each version of QBSS can be optionally be configured on the access point.

Wired QoS

Configure QoS settings and policies for the necessary network devices.
Configuring Cisco Switch Ports for WLAN Devices
Configure the Cisco Wireless LAN Controller and Cisco Access Point switch ports as well as any uplink switch ports.
If utilizing Cisco IOS Switches, use the following switch port configurations.
Enable COS trust for Cisco Wireless LAN Controller
mls qos
!
interface X
mls qos trust cos
Enable DSCP trust for Cisco Access Points
Cisco IP Phone 8861 and 8865 Wireless LAN Deployment Guide
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