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7-4
Cisco Wireless Router and HWIC Configuration Guide
OL-6415-03
Chapter 7 Configuring QoS on an Access Point
Configuration Guidelines
In addition, a Cisco access point uses Access Control Lists for forwarding or blocking packets on
selective basis, as designated by the user for the purpose of:
• Providing QoS for Voice-over-IP (VoIP) phones.
• Mapping IP precedence values into 802.1P/Q Class of Service (CoS) values for downlink traffic.
• Providing Layer 2 and Layer 3 Access Control List features to the bridging path and access point
host receive path.
802.11 VOIP Phone Support
The Symbol element is advertised by the access point. This helps a Symbol phone to make an association
decision if there are multiple access points serving the area. The current packet rate is the calculation of
average means of number of packets transmitted per second for the past 8 seconds.
After the normal 802.11 association process, a Symbol phone sends a proprietary Symbol 802.11 phone
registration message (WNMP) to the access point to complete the association.
The Symbol phone does not associate to an access point if the advertised packet rate is above the
threshold of the access point. The Symbol phone uses its Symbol Element as optional information. Basic
operation does not require an access point to send Symbol Elements.
Mapping IP Precedence Examples
The QoS examples in this section show the mapping of IP precedence.
Matching IP Precedence
class-map match-any ip_pres_5
match ip precedence 5
policy-map priority_queue
class ip_pres_5
set cos 5
interface Dot11Radio 0/2/0
ip address 30.5.0.105 255.255.0.0
service-policy output priority_queue
Matching IP DSCP
class-map match-any ip_dscp_40_47
match ip dscp ef
!
policy-map priority_queue
class ip_dscp_40_47
set cos 5
!
interface Dot11Radio 0/2/0
no ip address
service-policy output priority_queue