Configuring quality of service 347Nortel WLAN—Security Switch 2300 Series Configuration GuideMapping from 802.1p, WMM user priority to CoS is static. Also, mapping from CoS to access category (AC) on the APsis 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 modeWSS Software supports Layer 2 and Layer 3 classification and marking of traffic, to help provide end-to-end QoSthroughout 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. WMMQoS 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 bydefault.Table 2: WMM Priority MappingsCoS WMM UserPriority 802.1p IP ToS IP Precedence DSCP AP ForwardingQueue0 0 0 0 0 0 Best Effort1 1 1 0x20 1 8 Background2 2 2 0x40 2 16 Background3 3 3 0x60 3 24 Best Effort4 4 4 0x80 4 32 Video5 5 5 0xa0 5 406 6 6 0xc0 6 48 Voice7 7 7 0xe0 7 56Table 3: CoS-to-AP-Forwarding-Queue MappingsCoS AP Forwarding Queue(Access Category)1 or 2 Background0 or 3 Best Effort4 or 5 Video6 or 7 Voice
