CLI Reference Guide

650 QoS Commands
When ETS is operational on a switch, this command overrides the ETS
assignments and assigns minimum bandwidth constraints across traffic class
groups. This allows the administrator to ensure that the frame scheduler does
not completely starve lower priority groups when strict priority is enabled on a
high numbered TCG. Specifically, assigning a minimum bandwidth to a
lower numbered TCG, even when strict priority is enabled on a higher
numbered TCG, will alter the normal scheduler behavior and cause the
scheduler to process frames from the lower numbered TCG to conform to the
min-bandwidth constraint.
Example
The following example displays how to specify the minimum transmission
bandwidth guarantee for cos-queues 0 through 6.
console(config)#cos-queue min-bandwidth 5 5 10 10 0 0 0
cos-queue random-detect
Use the cos-queue random-detect command in Global Configuration or
Interface Configuration mode to enable WRED queue management policy
on an interface CoS queue. Use the no form of the command to disable
WRED policy for a CoS queue on an interface.
Syntax
cos-queue {random-detect queue-id1 [ queue-id2 .. queue-idn ]}
no cos-queue {random-detect
queue-id1 [ queue-id2 .. queue-idn ]}
• queue-id —An integer indicating the queue-id which is to be enabled for
WRED. Range 0-6. Up to 7 queues may be simultaneously specified.
Default Configuration
WRED queue management policy is disabled by default. Tail-drop queue
management policy is enabled by default. The threshold for invoking tail-
drop behavior when WRED is disabled is approximately 1/2 of the remaining
free packet buffer in the switch.
2CSNXXX_SWUM200.book Page 650 Tuesday, December 10, 2013 1:22 PM