Quality of Service (QoS): Managing Bandwidth More Effectively

Using QoS Classifiers To Configure Quality of Service for Outbound Traffic

Assigning a Priority Based on TCP or UDP Port Number

This option assigns an 802.1p priority to outbound TCP or UDP packets as described below.

Syntax: qos < udp-port tcp-port > < tcp or udp port number > priority < 0 - 7 >

Configures an 802.1p priority for outbound packets having the specified TCP or UDP application port number. This priority determines the packet’s queue in the outbound port to which it is sent. If the packet leaves the switch in a tagged VLAN, it carries the 802.1p priority with it to the next downstream device. (Default: Disabled)

no qos < udp-port tcp-port > < tcp-udp port number >

Deletes the specified UDP or TCP port number as a QoS classifier.

show qos tcp-udp-port-priority

Displays a listing of all TCP and UDP QoS classifiers currently in the running-config file.

For example, configure and list 802.1p priority for the following UDP and TCP port prioritization:

TCP/UDP Port

802.1p Priority

802.1p Priority

 

for TCP

for UDP

 

 

 

TCP Port 23 (Telnet)

7

7

 

 

UDP Port 23 (Telnet)

7

7

 

 

TCP Port 80 (World

2

2

 

 

Wide Web HTTP)

 

 

UDP Port 80 (World

1

1

 

 

Wide Web HTTP)

15-15