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Catalyst 6500 Series Switch Command Reference—Release7.6
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Chapter2 Catalyst 6500 Series Switch and ROM Monitor Commands
set qos txq-ratio
set qos txq-ratio
To set the amount of packet buffer memory allocated to high-priority traf f i c and lo w-prio rity traffic, use
the set qos txq-ratio command.
set qos txq-ratio port_type queue1_val queue2_val... queueN_val
Syntax Description
Defaults The default for 2q2t is 80:20 if you enable QoS and 100:0 if you disable QoS. The default for 1p2q2t is
70:15:15 if you enable QoS and 100:0:0 if you disable QoS.
Command Types Switch command.
Command Modes Privileged.
Usage Guidelines
Caution Use caution when using this command. When entering the set qos txq-ratio command, all ports go
through a link up and down condition.
The values set in hardware will be close approximations of the values provided. For example, even if
you specify 0 percent, the actual value programmed will not necessarily be 0.
The txq ratio is determined by the traffic mix in the network. Because high-priority traf fic is typically a
smaller fraction of the traffic and because the high-priority queue g et s more service, you should set the
high-priority queue lower than the low-priority queue.
The strict-priority queue requires no configuration.
For the strict-priority queue on 1p2q1t egress ports, the minimum valid value i s 5 pe rc ent.
port_type Port type; valid values are 2q2t, 1p2q2t, and 1p2q1t.
queue1_val Percentage of low-priority traffic; valid values are from 1 to 99 and must
total 100 with the queue2_val value.
queue2_val Percentage of high-priority traffic; valid values are from 1 to 99 and mu st
total 100 with the queue1_val value.
queueN_val Percentage of strict-priority traffic; valid values are from 1 to 99 and must
total 100.