HP ProCurve Series 6120 Blade Switches Advanced Traffic Management Guide

5-15
Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure Quality of Service for Outbound Traffic
■ IP packets received through a VLAN-tagged port are managed using the
802.1p priority they carry in the 802.1Q field in their headers.
■ VLAN-tagged packets received through an untagged port are handled by
the switch with “normal” priority.
For example, Figure 5-3 below shows the QoS configurations on the switch
that are configured with the VLAN ID classifier. Note that non-default 802.1p
priorities have been configured for VLAN IDs 22 and 33; packets received on
VLAN 1 are managed with the default settings, as described in the two bulleted
items above.
Figure 5-3. 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.
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 5-72.
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.)
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.