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Software Requirements
Software Requirements
QoS requires supervisor engine software release 5.2 or later releases.
Use the show port capabilities command to determine the specific QoS support for a module.
QoS Default Configuration
Table 14-1
Table 14-1 QoS Default Configuration
Feature
QoS global enable state
Switch CoS value
Transmit queue drop threshold
percentages
CoS value-to-drop threshold mapping Transmit queue drop threshold 1: CoS 0–7
CoS value-to-transmit queue mapping Transmit queue 1: CoS 0–7
1. Non-user-configurable
Configuring QoS
These sections describe how to configure QoS:
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Because entering some QoS commands disables and then reenables ports (which can cause spanning tree
Note
topology changes), enter QoS commands only when necessary.
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
14-4
shows the QoS default configuration.
Enabling QoS Globally, page 14-5
Configuring the Default CoS Value for the Switch, page 14-5
Reverting to the Default Switch CoS Value, page 14-5
Mapping CoS Values to Transmit Queues and Drop Thresholds, page 14-6
Reverting to the Default CoS-to-Transmit Queue and Drop Threshold Mapping, page 14-6
Displaying QoS Information, page 14-7
Reverting to QoS Defaults, page 14-7
Disabling QoS, page 14-7
Default Value
Disabled
0
1
Threshold 1:100%
Transmit queue 2: None configured
Chapter 14
Configuring QoS
1.
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Troubleshooting
