Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure Quality of Service for Outbound Traffic
Note As mentioned in table 8-6, the 3400cl/6400cl switches do not include the layer
3 protocol classifier. However, you can still apply a QoS priority to non-IP
Layer 3 protocol traffic by grouping such traffic into separate VLANs, as
desired, and then assigning a priority based on VLAN membership.
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.
Note UDP/TCP QoS applications are supported only for IPv4 packets only. For more
information on packet-type restrictions, refer to ‘‘Details of Packet Criteria
and Restrictions for QoS Support’’, on page 8-70.
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
8-24
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