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Catalyst 6500 Series Switch Command Reference—Release8.1
78-15474-01
Chapter2 Catalyst 6500 Series Switch and ROM Monitor Commands set qos rxq-ratio
set qos rxq-ratio
To set the amount of packet buffer memory allocated to high-priority incoming traffic and low-priority
incoming traffic, use the set qos rxq-ratio command.
set qos rxq-ratio port_type queue1_val queue2_val... queueN_val
Syntax Description
Defaults The default is 80:20 (queue 1 and queue 2) if you enable QoS and 100:0 (queue 1 and queue 2) 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 rxq-ratio command, all ports go
through a link up and link down condition.
The values set in hardware are close approximations of the values p ro vided . F or e xam ple, if you sp ecif y
0 percent, the actual value programmed is not necessar ily 0.
The rxq ratio is determined by the traffic mix in the network. High-priority traffic is typically a smaller
fraction of the traffic. Because the high-priority queue gets 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 1p1q8t ingress ports, the minimum valid value is 3 per cent.
port_type Port type; valid value is 1p1q0t and 1p1q8t.
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 with the queue1_val and queue1 _val values.