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Configuring quality of service 347
Nortel WLAN—Security Switch 2300 Series Configuration Guide
Mapping from 802.1p, WMM user priority to CoS is static. Also, mapping from CoS to access category (AC) on the APs
is static.
Table 4 shows how WMM priority information is mapped across the network.
Table 5 lists the default mappings between internal CoS values on an AP and the forwarding queues.
To display CoS mappings and queue usage statistics on an AP, see “Displaying AP forwarding queue statistics”
(page 364).
QoS mode
WSS Software supports Layer 2 and Layer 3 classification and marking of traffic, to help provide end-to-end QoS
throughout the network. The following modes of QoS are supported:
• Wi-Fi Multimedia (WMM)—Provides wireless QoS for time-sensitive applications such as voice and video. WMM
QoS is enabled by default and does not require any configuration.
• SpectraLink Voice Priority (SVP)—Provides optimized forwarding of SVP voice traffic. SVP QoS is disabled by
default.
Table 2: WMM Priority Mappings
CoS
WMM User
Priority
802.1p IP ToS IP Precedence DSCP
AP Forwarding
Queue
0 0 0 0 0 0 Best Effort
1 1 1 0x20 1 8 Background
2 2 2 0x40 2 16 Background
3 3 3 0x60 3 24 Best Effort
4 4 4 0x80 4 32 Video
5 5 5 0xa0 5 40
6 6 6 0xc0 6 48 Voice
77 7 0xe0 7 56
Table 3: CoS-to-AP-Forwarding-Queue Mappings
CoS
AP Forwarding Queue
(Access Category)
1 or 2 Background
0 or 3 Best Effort
4 or 5 Video
6 or 7 Voice