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Configuring QoS
Mapping CoS Values to Transmit Queues and Drop Thresholds
Use the set qos map command to associate CoS values to transmit queue drop thresholds.
The port_type is hardware-dependent. Use the show port capabilities command to determine the
port_type for your hardware. The port type is defined by the number of transmit queues and the number
of drop thresholds supported on the port. For example, the 2q1t port type supports two transmit queues
and one drop threshold.
The q# is the transmit queue number. The threshold# is the drop threshold number for the specified
queue.
The cos_list is the list of CoS values to map to the specified transmit queue and drop threshold. CoS
values must be specified in pairs (0–1, 2–3, 4–5, and 6–7).
To associate CoS values to a transmit queue and drop threshold, perform this task in privileged mode:
Task
Associate a CoS value to a transmit queue and
drop threshold.
This example shows how to map CoS values 4 through 7 to the second transmit queue and the first drop
threshold for that queue on a 2q1t port:
Console> (enable) set qos map 2q1t 2 1 cos 4-7
Qos tx priority queue and threshold mapped to cos successfully.
Console> (enable)
Reverting to the Default CoS-to-Transmit Queue and Drop Threshold Mapping
Use the clear qos map command to revert to the default CoS-to-transmit queue and drop threshold
mappings.
The port_type is hardware-dependent. Use the show port capabilities command to determine the
port_type for your hardware.
To revert to the default CoS-to-transmit queue and drop threshold mappings, perform this task in
privileged mode:
Task
Revert to default CoS-to-transmit queue and drop
threshold mappings.
This example shows how to return the CoS-to-transmit queue and drop threshold mappings to the default
values on 2q1t ports:
Console> (enable) clear qos map 2q1t
Qos map setting cleared.
Console> (enable)
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
14-6
Chapter 14
Command
set qos map port_type q# threshold# cos cos_list
Command
clear qos map port_type
Configuring QoS
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