HP ProCurve Series 6120 Blade Switches Advanced Traffic Management Guide

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Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure Quality of Service for Outbound Traffic
Figure 5-17. Configuring and Displaying QoS Priorities on VLANs
If you then decided to remove VLAN_22 from QoS prioritization:
Figure 5-18. Returning a QoS-Prioritized VLAN to “No-override” Status
Assigning a DSCP Policy Based on VLAN-ID (VID)
This option assigns a previously configured DSCP policy (codepoint and
802.1p priority) to outbound IP packets having the specified VLAN-ID (VID).
The switch performs the following:
1. Selects an incoming IP packet on the basis of the VLAN-ID it carries.
2. Overwrites the packet’s DSCP with the DSCP configured in the switch for
such packets.
3. Assigns the 802.1p priority configured in the switch for the new DSCP.
(Refer to “Differentiated Services Codepoint (DSCP) Mapping” on page
5-51.)
4. Forwards the packet through the appropriate outbound port queue.
ProCurve(config)# vlan 1 qos dscp 9
ProCurve(config)# vlan 22 qos dscp 8
ProCurve(config)# show qos vlan-priority
VLAN priorities
VLAN ID Apply rule | DSCP Priority
------- ----------- + ------ -----------
1 DSCP | 9 7
22 DSCP | 8 6
ProCurve(config)# no vlan 22 qos
ProCurve(config)# show qos vlan
VLAN priorities
VLAN ID Apply rule | DSCP Priority
------- ----------- + ------ -----------
1 DSCP | 9 7
22 No-override | No-override
In this instance, No- override
indicates that VLAN 22 is not
prioritized by QoS.