Quality of Service (QoS): Managing Bandwidth More Effectively

Preparation for Configuring QoS

Configuring a Policy When There Are Not Enough Rules Available.

Attempting to configure a QoS policy on the switch or a VLAN when there are not enough rules available results in the following:

The policy is not configured.

The CLI displays a message similar to the following:

Unable to add this QoS rule. Maximum number (max-num) already reached.

Adding a Port to a QoS-Configured VLAN Without Enough Rules

Available. When you add a port to an existing, QoS-configured VLAN, the switch attempts to apply the VLAN’s QoS configuration to the port. If there are insufficient rule resources to add the VLAN’s QoS configuration:

The port is added to the VLAN.

The QoS classifiers configured on the VLAN are not added to the port, which means that the port does not honor the QoS policies configured for the VLAN.

The switch generates an Event Log message similar to the following:

cos: Vlan 1 QoS not configured on all new ports. Some QoS resources exceeded

Troubleshooting a Shortage of Rule Resources

The lack of available rules is caused by existing QoS configurations consuming the available rules. Do the following to enable configuration of the desired policy:

1.Use the show qos resources command to determine rule and resource usage.

ProCurve(config)# show qos resources

QoS Resource Usage

 

 

 

 

 

 

 

 

The interface/Vlan feature

 

 

Rules Rules

Resources Resources

used 2 rules out of a total of

Feature

 

127 total rules available for

 

Used

 

Maximum Used

 

 

Required

these features.

interface/Vlan-----------------

-----2

-------127

---------

1

--------1

The dev-pri/L4 port feature

used 2 rules out of a total of

type-of-service

0

64

0

1

125 rules available for these

dev-pri/L4-port

2

128

1

1

features.

2 of 3 QoS resources used

Figure 6-3. Example of Inspecting Available Rule Resources

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