Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure QoS for Outbound Traffic
C o m b i n i n g
P o l i c y Ty p e sAssigning a DSCP Policy Based on TCP or UDP Port Number
This option assigns a previously configured DSCP policy (codepoint and 802.1p priority) to (IPv4) TCP or UDP packets having the specified port number. That is, the switch:
1.Selects an incoming IP packet if the TCP or UDP port number (or range) it carries matches the port number specified in the TCP or UDP classifier (as shown in figure
2.Overwrites
3.Assigns the 802.1p priority for that new DSCP codepoint, as configured automatically or by the user in the QoS
4.Forwards the packet through the appropriate outbound port queue.
On switches covered in this guide, “mixing” ToS DSCP policies and 802.1p priorities is not recommended. Refer to the Note on page
For more on DSCP, refer to “Terminology” on page
Classifiers. This procedure creates a DSCP policy for IPv4 packets carrying the selected UDP or TCP
1.Identify the TCP or UDP
2.Determine the DSCP policy for packets carrying the selected TCP or UDP port number.
a.Determine the DSCP you want to assign to the selected packets. (This codepoint will be used to overwrite
b.Determine the 802.1p priority you want to assign to the DSCP.
3.Configure the DSCP policy by using qos