Quality of Service (QoS): Managing Bandwidth More Effectively
Preparation for Configuring QoS
Configuring a Policy When There Are Not Enough Rules Available On
a Target Port. Attempting to configure a QoS policy on the switch, on a
VLAN, or on selected ports when there are not enough rules available on one
or more ports that are subject to the command results in the following:
■ The policy is not configured on any ports subject to the command.
■ The CLI displays the following message:
Unable to add this QoS rule. Maximum number (120)
already reached.
Adding a Port to a QoS-Configured VLAN Without Enough Rules
Available on the Port. 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 the port has 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 this message in the Event Log:
cos: Vlan 1 QoS not configured on all new ports.
Some QoS resources exceeded
Troubleshooting a Shortage of Per-Port Rule Resources on
the 3400cl/6400cl Switches
The lack of available rules is caused by existing QoS, ACL, and (if configured)
Rate-Limiting configurations consuming the available rules on one or more
ports. Do the following to enable configuration of the desired policy:
1. Use the show qos resources command to identify the port(s) on which
there are insufficient rule resources. For example, figure
8-3 includes
ports that can be the source of problems due to rule consumption by
policies configured earlier:
8-18
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