Viewing And Changing Cos Mappings; Viewing Cos Mappings; Changing A Dscp-To-Cos Mapping - Nortel 2350 Reference Manual

Note.
You cannot delete the ACE at the bottom of the list. This ACE is added to the ACL
automatically and cannot be deleted. The ACE at the bottom denies all traffic that does not
match other ACEs in the ACL.

Viewing and Changing CoS Mappings

WSS Software supports Layer 2 and Layer 3 classification and marking of traffic, to help provide end-to-end QoS
throughout the network. QoS support 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. WSSs and APs each provide QoS:
• WSSs classify and mark traffic based on 802.1p tag value (for tagged traffic) or Differentiated Services Code Point
(DSCP) value.
• APs 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 AP forwards the user traffic to the WSS.
APs place traffic from a WSS 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.
WSS Software 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 WSS Software QoS works, see the 'Configuring Quality of Service' chapter in the
Nortel WLAN Security Switch 2300 Series Configuration

Viewing CoS Mappings

1
Select the Configuration tool bar option.
2
In the Organizer panel, click the plus sign next to the WSS.
3
Click the plus sign next to System.
4
Select QoS.
The QoS mappings appear in the Content panel. The DSCP to CoS table lists the internal CoS values to
which WSS Software maps DSCP values during classification of ingress traffic. The CoS to DSCP table
lists the DSCP values to which WSS Software maps internal CoS values during marking of egress traffic.

Changing a DSCP-to-CoS Mapping

To change the mapping between a DSCP value in an ingress packet and its internal CoS value:
Guide.)
Nortel WLAN—Management Software 2300 Series Reference Guide
Configuring WSS System Parameters 217