User's Manual

11-3
Cisco 3200 Series Wireless MIC Software Configuration Guide
OL-7734-02
Chapter 11 Configuring QoS in a Wireless Environment
Configuring QoS
QoS on the wireless LAN focuses on downstream prioritization from the WMIC. These are the effects
of QoS on network traffic:
• The radio downstream flow is traffic transmitted out the WMIC radio to another bridge. This traffic
is the main focus for QoS on a wireless LAN.
• The radio upstream flow is traffic received on the WMIC radio from another bridge. QoS for
wireless LAN does not affect this traffic.
• The Ethernet downstream flow is traffic sent from a switch or a router to the Ethernet port on the
WMIC. If QoS is enabled on the switch or router, the switch or router might prioritize and rate-limit
traffic to the WMIC.
• The Ethernet upstream flow is traffic sent from the WMIC Ethernet port to a switch or router on the
wired LAN. The WMIC does not prioritize traffic that it sends to the wired LAN based on traffic
classification.
Precedence of QoS Settings
When you enable QoS, the WMIC queues packets based on the Layer 2 class of service value for each
packet. The WMIC applies QoS policies in this order:
1. Packets already classified—When the WMIC receives packets from a QoS-enabled switch or router
that has already classified the packets with non-zero 802.1Q/P user_priority values, the WMIC uses
that classification and does not apply other QoS policy rules to the packets. An existing
classification takes precedence over all other policies on the WMIC.
Note The WMIC always acts on tagged 802.1P packets that it receives over the radio interface, even if a QoS
policy has not been configured.
2. Policies you create on the WMIC—QoS Policies that you create and apply to VLANs or to the
WMIC interfaces are second in precedence after previously classified packets.
3. Default classification for all packets on VLAN—If you set a default classification for all packets on
a VLAN, that policy is third in the precedence list.
Configuring QoS
QoS is disabled by default. This section describes how to configure QoS on your WMIC. It contains this
configuration information:
• Configuration Guidelines, page 11-4
• Configuring QoS Using the Web-Browser Interface, page 11-4
• Adjusting Radio Access Category Definitions, page 11-7