Impact of QoS on a Wireless LAN

Chapter 7 Configuring QoS on an Access Point

Understanding QoS for Wireless LANs

•Does not construct internal DSCP values; it only supports mapping by assigning IP DSCP, precedence, or protocol values to Layer 2 CoS values. Table 7-1lists the class of service (CoS) values as they map to DSCP values.

Table 7-1	CoS Values Mapped to DSCP Values

CoS Value		DSCP Value

1		10

2		18

3		26

4		34

5		46

6		48

7		56

•Carries out Enhanced DCF (EDCF)-like queuing on the radio egress port only.

•Support only 802.1Q/P tagged packets. Access points do not support ISL.

•Support only Cisco Modular QoS CLI (MQC) policy-map set cos action.

•Prioritize the traffic from voice clients (such as Symbol phones) over traffic from other clients when the QoS Element for Wireless Phones feature is enabled.

To contrast the wireless LAN QoS implementation with the QoS implementation on other Cisco network devices, see the Cisco IOS Quality of Service Solutions Configuration Guide at this URL:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fqos_c/index.htm

Wireless LAN QoS features are a subset of the proposed 802.11e draft. QoS on wireless LANs provides prioritization of traffic from the access point over the WLAN based on traffic classification.

Just as in other media, you might not notice the effects of QoS on a lightly loaded wireless LAN. The benefits of QoS become more obvious as the load on the wireless LAN increases, keeping the latency, jitter, and loss for selected traffic types within an acceptable range.

QoS on the wireless LAN focuses on downstream prioritization from the access point:

•The radio downstream flow is traffic transmitted out the access point radio to a wireless client device. This traffic is the main focus for QoS on a wireless LAN.

•The radio upstream flow is traffic transmitted out the wireless client device to the access point. QoS for wireless LANs does not affect this traffic.

•The Ethernet downstream flow is traffic sent from a switch or a router to the Ethernet port on the access point. If QoS is enabled on the switch or router, the switch or router might prioritize and rate-limit traffic to the access point.

•The Ethernet upstream flow is traffic sent from the access point Ethernet port to a switch or router on the wired LAN. The access point does not prioritize traffic that it sends to the wired LAN based on traffic classification.

Figure 7-1shows the upstream and downstream traffic flow.

Cisco Wireless Router and HWIC Configuration Guide

7-2	OL-6415-03

OL-6415-03 specifications

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CoS Value

DSCP Value