HP 6120XG HP ProCurve Series 6120 Blade Switches Advanced Traffic Management G - Page 237
Note On Changing a Priority Setting, No-override, Cannot modify DSCP Policy <
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Quality of Service (QoS): Managing Bandwidth More Effectively Differentiated Services Codepoint (DSCP) Mapping Effect of "No-override". In the QoS Type-of-Service differentiated services mode, a No-override assignment for the codepoint of an outbound packet means that QoS is effectively disabled for such packets. That is, QoS does not affect the packet queuing priority or VLAN tagging. In this case, the packets are handled as follows (as long as no other QoS feature creates priority assignments for them): 802.1Q Status Received and Forwarded on a tagged port member of a VLAN. Received on an Untagged port member of a VLAN; Forwarded on a tagged port member of a VLAN. Forwarded on an Untagged port member of a VLAN. Outbound 802.1p Priority Unchanged 0 (zero)-"normal" None Note On Changing a Priority Setting If a QoS classifier is using a policy (codepoint and associated priority) in the DSCP Policy table, you must delete or change this usage before you can change the priority setting on the codepoint. Otherwise the switch blocks the change and displays this message: Cannot modify DSCP Policy < codepoint > - in use by other qos rules. In this case, use show qos < classifier > to identify the specific classifiers using the policy you want to change; that is: show qos device-priority show qos port-priority show qos tcp-udp-port-priority show qos vlan-priority show qos type-of-service For example, suppose that the 000001 (dscp 1) codepoint has a priority of 6, and several classifiers use the 000001 codepoint to assign a priority to their respective types of traffic. If you wanted to change the priority of codepoint 000001 you would do the following: 1. Identify which QoS classifiers use the codepoint. 2. Change the classifier configurations by assigning them to a different DSCP policy, or to an 802.1p priority, or to No-override. 3. Reconfigure the desired priority for the 000001 (dscp 1) codepoint. 4. Either reassign the classifiers to the 00001 (dscp 1) codepoint policy or leave them as they were after step 2, above. 5-57