Qos Support - Foundry Networks IronPoint 200 User Manual

Quality of Service (QoS) allows you to specify which data packets have greater precedence when
traffic is buffered in the access point due to congestion. Data packets received on an interface can be
mapped to IEEE 802.1p priority levels based on the source or destination MAC address, or the
Ethernet protocol type. At the transmit wireless interface, data packets with a high priority are
transmitted before those of a lower priority.
The priority levels recommended in the IEEE 802.1p standard for various network applications are
shown in the following table.
Priority Level
1
2
0 (default)
3
4
5
6
7
Note the following points about the access point's QoS support:
• When traffic classification is based on the source or destination MAC address, a table of MAC
addresses mapped to 802.1p priority levels must be entered in the QOS Classifications section.
Up to 10 MAC addresses can be specified.
• When traffic classification is based on the frame's priority tag, the MAC address and Ethernet type
classification tables are not used. Up to 10 Ethernet protocol types can be specified.
• If traffic received on the Ethernet interface needs to be classified based on the tagged priority of
frames, VLAN support must be enabled (see "Enabling VLAN Support" on page 22-2). If VLAN
support is not enabled, the tags are stripped as frames are received on the Ethernet interface.
• Data packets received on the Ethernet interface are based directly on the 802.1p or VLAN tag. If
no tag exists (such as when VLAN support is disabled), priority levels are mapped to the data
based on the configured classification parameters or assigned the default priority level (zero).
December 2006
Traffic Type
Background
(Spare)
Best Effort
Excellent Effort
Controlled Load
Video, less than 100 milliseconds latency and jitter
Voice, less than 10 milliseconds latency and jitter
Network Control
© 2006 Foundry Networks, Inc.
Chapter 24

QoS Support

24-1