Viewing and Changing CoS Mappings 231

Viewing and

MSS supports Layer 2 and Layer 3 classification and marking of traffic, to

Changing CoS

help provide end-to-end QoS throughout the network. QoS support

Mappings

includes support of Wi-Fi Multimedia (WMM), which provides wireless

 

QoS for time-sensitive applications such as voice and video.

 

QoS support is automatically enabled. WX switches and MAPs each

 

provide QoS:

 

„ WX switches classify and mark traffic based on 802.1p tag value (for

 

tagged traffic) or Differentiated Services Code Point (DSCP) value.

 

„ MAPs classify ingress traffic from wireless clients based on the service

 

type value in the 802.11 header, and mark the DSCP value in the IP

 

tunnel on which the MAP forwards the user traffic to the WX.

 

MAPs place traffic from a WX to a wireless client in a forwarding

 

queue based on the DSCP value in the tunnel carrying the traffic, then

 

forward the traffic based on the queue’s priority.

 

MSS performs classification on ingress to determine a packet’s CoS value.

 

This CoS value is used to mark the packet at the egress interface.

 

The classification and marking performed by the switch depend on

 

whether the ingress interface has an 802.1p or DSCP value other than 0,

 

and whether the egress interface is tagged or is an IP tunnel.

 

The mappings between DSCP and CoS values are configurable.

 

(For more information about how MSS QoS works, see the “Configuring

 

Quality of Service” chapter in the Wireless LAN Switch and Controller

 

Configuration Guide.)

Viewing CoS To view CoS mappings:

Mappings

1Select the Configuration tool bar option.

2In the Organizer panel, click the plus sign next to the WX switch.

3Click the plus sign next to System.

4Select QoS.

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3Com 3CRWXR10095A, 3CRWX120695A WXR100, WX4400 3CRWX440095A WX1200 manual Changing CoS, Mappings