User`s manual

209
DWS-1008 User’s Manual
D-Link Systems, Inc.
Wi-Fi Multimedia
QoS on a DWL-8220AP
DWL-8220AP access points use forwarding queues to prioritize trafc to wireless clients.
When the AP receives a packet from a DWS-1008 switch, the AP places the packet into one
of four forwarding queues. The AP’s queue selection is based on the IP ToS setting in the
tunnel header of the encapsulated data packet received from the switch. The AP has the
following forwarding queues, listed from lowest priority to highest priority:
• Background
• Best effort
• Video
• Voice
The table below shows how WMM priority information is mapped across the network. When
WMM is enabled in MSS, D-Link switches and APs perform these mappings automatically.
WMM Priority Mappings
IP
Precedence
IP ToS DSCP 802.1p CoS
AP
Forwarding
Queue
0 0 0 0 0 0
3 3 0x60 24 3 3
1 1 0x20 8 1 1 Best Effort
2 2 0x40 16 2 2
4 4 0x80 32 4 4 Video
5 5 0xa0 40 5 5
6 6 0xc0 48 6 6 Voice
7 7 0xe0 56 7 7
Disabling or Reenabling WMM
WMM is enabled by default on all radio proles. To disable the feature on a radio prole,
use the following command:
set radio-prole name wmm {enable | disable}
When WMM is disabled, AP forwarding prioritization is optimized for SVP instead of WMM,
and the AP does not tag packets it sends to the switch.
If you plan to use SVP or another non-WMM type of prioritization, you must congure ACLs
to tag the packets.
Displaying WMM Information
You can display the WMM state for a radio prole. You also can display statistics for AP
forwarding queues.