KB.15.15

Example 153 Viewing the VLANs available for QoS prioritization

802.1p priorities are assigned to packets received in VLANs 1, 20, 30, and 40:

Enter the following commands to mark VLAN packets that match the specified VLAN IDs with an

802.1p priority:

HP Switch(config)#: vlan 1 qos priority 2

HP Switch(config)#: vlan 20 qos priority 5

HP Switch(config)#: vlan 30 qos priority 5

HP Switch(config)#: vlan 40 qos priority 7

HP Switch(config)#: show qos vlan

VLAN priorities

VLAN ID Apply rule | DSCP Priority

------- ------------+ ------ -------------

1 Priority | 2

20 Priority | 5

30 Priority | 5

40 Priority | 7

Example 154 Returning a QoS-prioritized VLAN to "No-override" status

If later it is necessary to remove VLAN 20 from QoS prioritization, enter the following command:

Assigning a DSCP policy for a global VLAN-ID classifier

This global QoS packet-marking option assigns a previously configured DSCP policy (codepoint

and 802.1p priority) to outbound IP packets having the specified VLAN-ID (VID). The switch:

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 for matching packets.

3. Assigns the 802.1p priority associated with the new DSCP.

210 Quality of Service: Managing bandwidth effectively