3D Connexion OL-6415-03 manual Configuration Guidelines, Precedence of QoS Settings

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Chapter 7 Configuring QoS on an Access Point

Configuration Guidelines

Figure 7-1 Upstream and Downstream Traffic Flow

 

Radio

 

Ethernet

 

downstream

 

downstream

Client

Radio

Access

Ethernet

upstream

point

upstream

device

 

 

 

Wired

LAN

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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 7-2shows the precedence of QoS filters. Precedence number zero is the highest.

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.

 

 

 

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.

Cisco Wireless Router and HWIC Configuration Guide

 

OL-6415-03

7-3

 

 

 

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Contents Understanding QoS for Wireless LANs QoS for Wireless LANs Versus QoS on Wired LANsRecommended Reading CoS Value Dscp Value Impact of QoS on a Wireless LANPrecedence Filter Type Configuration GuidelinesPrecedence of QoS Settings Element for Wireless Phones settingMapping IP Precedence Examples Voip Phone SupportPriority Fixed slottime Number CWmin CWmax Cisco Wireless IP Phone 7920 SupportAdjusting Radio Access Categories Radio Interface Transmit QueuesQoS on Vlan Access Control ListsEthernet Interface Transmit Queue 802.1Q Untagged Voice PacketsACL Range Location Applying Access Control ListsInstall Ethernet Type or SAP Acess Control List Enable 802.11 Phone SupportInstall IP Acess Control List Install MAC address Acess Control ListPolicy Map Keyword for Set COS Value Configure Contention Windows Values To Traffic ClassesApply Layer 2 Acess Control List To Packet Received/Sent Class Map Keyword for VlanOL-6415-03

OL-6415-03 specifications

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