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:
â– The policy is not configured on any ports subject to the command.
â– 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:
â– 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.
â– 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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