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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 52 Configuring QoS
Configuring QoS on the Switch
• Configuring the Receive-Queue Size Ratio, page 52-67
• Configuring the Transmit-Queue Size Ratio, page 52-67
• Mapping the CoS Values to the Drop Thresholds, page 52-67
• Configuring the DSCP Value Maps, page 52-73
• Displaying QoS Information, page 52-76
• Displaying the QoS Statistics, page 52-77
• Reverting to the QoS Defaults, page 52-79
• Disabling QoS, page 52-79
• Configuring COPS Support, page 52-79
• Configuring RSVP Support, page 52-85
• Configuring QoS Statistics Data Export, page 52-89
Note Some QoS show commands support the config and runtime keywords. Use the runtime keyword to
display the QoS values that are currently programmed into the hardware. When you disable QoS, the
display with the runtime keyword is “QoS is disabled.” Use the config keyword to display the values
from the commands that have been entered but which may not currently be programmed into the
hardware (for example, the locally configured QoS values that are currently not used because COPS has
been selected as the QoS policy source or the QoS values that are configured when QoS is disabled).
Enabling QoS
To enable QoS, perform this task in privileged mode:
This example shows how to enable QoS:
Console> (enable) set qos enable
QoS is enabled.
Console> (enable)
Enabling DSCP Rewrite
Note Only PFC3 supports the configuration commands in this section.
To enable DSCP rewrite, which uses the DSCP value from marking and policing as the egress DSCP
value, perform this task in privileged mode:
Task Command
Enable QoS on the switch. set qos {enable | disable}
Task Command
Enable DSCP rewrite on the switch. set qos dscp-rewrite enable
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