DELL 8132 ユーザーズマニュアル

QoS Commands

The maximum number of queues supported per interface is seven. It is 

recommended that the operator avoid the use of queue 5-7 in order to avoid 

conflicts with inter- and intra-network control traffic. 
In order to better accommodate bursty traffic, it is recommended that the 

sum of the configured min-bandwidths be much less than 100%. Configuring 

the minimum bandwidths such that they sum to 100% effectively locks the 

scheduler such that bandwidth sharing by lower priority queues cannot be 

accommodated under congestion conditions.
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. 

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

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.

cos-queue {random-detect 

queue-id1 [queue-id2..queue-idn]}

2CSPC4.X8100-SWUM102.book  Page 650  Friday, March 15, 2013  8:56 AM