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Quality of Service (QoS): Managing Bandwidth More Effectively
Preparation for Configuring QoS
Planning and Monitoring Rule Usage
The following two CLI commands are useful for planning and monitoring rule
usage in a QoS configuration.
Managing QoS Resource Consumption
Extensive QoS configurations can either fully subscribe the resources
available or leave an insufficient number of rules available for configuring
another QoS policy of that type. Problems with an insufficient number of rules
available can occur in the following QoS scenarios:
■ Attempting to configure a policy when there are an insufficient number
of rules available for a particular type
■ Attempting to configure a policy when an additional resource is required
and five QoS resources have already been used
■ Attempting to add a port to a QoS-configured VLAN where the policy
already on the VLAN requires more rule resources than are available.
The policy will not be configured on any ports subject to the command. The
CLI displays a message similar to the following:
Unable to add this QoS rule. Maximum number 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 types 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.
Syntax qos resources help
Provides a quick reference on how QoS uses rule resources for
each configuration option.
Syntax show qos resources
Shows the maximum number of rules available for each type,
the number of resources required by each type, and the
resources that have been used so far. This command is useful
for verifying rule availability as you proceed with configuring
QoS.
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