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Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure Quality of Service for Outbound Traffic
QoS UDP/TCP Priority
QoS Classifier Precedence: 1
When you use UDP or TCP and a layer 4 Application port number as a QoS
classifier, traffic carrying the specified UDP/TCP port number(s) is marked
with the UDP/TCP classifier’s configured priority level, without regard for any
other QoS classifiers in the switch.
Options for Assigning Priority. Priority control options for TCP or UDP
packets carrying a specified TCP or UDP port number include:
802.1p priority
DSCP policy (Assigning a new DSCP and an associated 802.1p priority;
inbound packets must be IPv4.)
For a given TCP or UDP port number, you can use only one of the above
options at a time. However, for different port numbers, you can use different
options.
TCP/UDP Port Number Ranges.
There are three ranges:
Well-Known Ports: 0 - 1023
Registered Ports: 1024 - 49151
Dynamic and/or Private Ports: 49152 - 65535
For more information, including a listing of UDP/TCP port numbers,
go to the Internet Assigned Numbers Authority (IANA) website at:
http://www.iana.org
Then click on:
Protocol Number Assignment Services
P (Under “Directory of General Assigned Numbers” heading)
Port Numbers
15-14