Dishwasher User Manual

7-3
Cisco Wireless Router and HWIC Configuration Guide
OL-6415-03
Chapter 7 Configuring QoS on an Access Point
Configuration Guidelines
Figure 7-1 Upstream and Downstream Traffic Flow
Precedence of QoS Settings
When you enable QoS, the access point queues packets based on the CoS value for each packet. If a
packet matches one of the filter types based on its current precedence, the packet is classified based on
the matching filter and no other filters are applied.
Table 7-2 shows the precedence of QoS filters. Precedence number zero is the highest.
Configuration Guidelines
Before configuring QoS on an access point, you should be aware of this information:
• Be familiar with the traffic on your wireless LAN. If you know the applications used by wireless
client devices, the sensitivity of applications to delay, and the amount of traffic associated with the
applications, configuring QoS improves performance.
• QoS does not create additional bandwidth on a wireless LAN; it helps control the allocation of
bandwidth. If there is enough of bandwidth on your wireless LAN, it might not be necessary to
configure QoS.
An access point is essentially a Layer 2 transparent bridge between wired and wireless networks.
Typically, bandwidth on wireless side constrains the the wired side. For example, 802.11b offers 6 Mbps
half duplex and 100baseT offers 100 Mbps full duplex.
Radio
downstream
Ethernet
downstream
Wired
LAN
Ethernet
upstream
Radio
upstream
Client
device
Access
point
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Table 7-2 Precedence of QoS Filters
Precedence Filter Type
0 Dynamicly created VoIP client filter. Traffic from voice clients takes
priority over other traffic regardless of other policy settings. This setting
takes precedence over all other policies, second only to previously
assigned packet classifications.
1 User configured class-map match clause (except match any). QoS Policies
configured for and that apply to VLANs or to the access point interfaces
are third in precedence after previously classified packets and the QoS
Element for Wireless Phones setting
2 User configured class-map match any clause (match VLAN). If a default
classification for all packets on a VLAN is set, that policy is fourth in the
precedence list.