ProCurve 2610-PWR Technical Information download pdf (Page 251)

Quality of Service (QoS): Managing Bandwidth More Effectively

Using QoS Classifiers To Configure QoS for Outbound Traffic

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 Outbound 802.1p

Priority

Received and Forwarded on a tagged port member of a VLAN. Unchanged

Received on an Untagged port member of a VLAN; Forwarded on a 0 (zero)—”normal”

tagged port member of a VLAN.

Forwarded on an Untagged port member of a VLAN. 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 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 codepoint.

4. Either reassign the classifiers to the 00001 codepoint policy or leave them

as they were after step 2, above.

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ProCurve 2610-PWR Technical Information Page 251