Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure QoS for Outbound Traffic
vlan-priority
Displays the current VLAN priority configuration.
Refer to figure 6-23 on page 6-48.
port-priority
Displays the current source-port priority
configuration. Refer to figure 6-28 on page 6-53.
No Override
By default, the IP ToS, VLAN-ID, and (source) port show outputs automatically
list No-override for priority options that have not been configured. This means
that if you do not configure a priority for a specific option, QoS does not
prioritize packets to which that option applies, resulting in the No override
state. In this case, IP packets received through a VLAN-tagged port receive
whatever 802.1p priority they carry in the 802.1Q tag in the packet’s header.
VLAN-tagged packets received through an untagged port are handled in the
switch with “normal” priority. For example, figure 6-5 below shows a qos
VLAN priority output in a switch where nondefault priorities exist for VLANs
22 and 33, while VLAN 1 remains in the default configuration.
This output shows that
VLAN 1 is in the default
state, while VLANs 22 and
33 have been configured
for 802.1p and DSCP Policy
priorities respectively.
Figure 6-5. Example of the Show QoS Output for VLAN Priority
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.
The UDP/TCP QoS option uses two rules per entry on all ports in the switch.
Note UDP/TCP Qos applications do not support IPV4 packets with IP options.
6-21
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