Users Guide
Usage Information You can configure up to a maximum of four lossless (PFC) queues. By configuring four lossless queues, you can
configure four different priorities and assign a particular priority to each application that your network is used to
process. For example, you can assign a higher priority for time-sensitive applications and a lower priority for other
services, such as file transfers. You can configure the amount of buffer space for each priority and the pause or
resume thresholds for the buffer. This method of configuration enables you to manage and administer the
behavior of lossless queues.
Example for
Configuration Mode
Dell(conf)# dcb-policy buffer-threshold stack-unit all stack-ports all test
Example for
Interface Mode
Dell(conf-if-te-1/1)#dcb-policy buffer-threshold test
service-class buffer shared-threshold-weight
Create a service class and associate the threshold weight of the shared buffer with each of the queues per port in the egress direction.
Syntax
[no] Service-class buffer shared-threshold-weight {[queue0 number] || [queue1
number] || [queue2 number] || [queue3 number] || [queue4 number] || [queue5
number] || [queue6 number] || [queue7 number]}
Parameters
buffer Define the shared buffer settings
shared-threshold-
weight
Specify the weight of a queue for the shared buffer space
queue 0 to queue 7 To apply the shared-threshold weight, specify the queue number
number Enter a weight for the queue on the shared buffer as a number in the range of 1 to 11.
Default The default threshold weight on the shared buffer for each queue is 9. Therefore, each queue can consume up to
66.67 percent of available shared buffer by default.
Command Modes INTERFACE mode
Command History
Version Description
9.9(0.0) Introduced on the M I/O Aggregator and the FN I/O Aggregator.
Usage Information You can configure all the data queues. You can configure queues 0-7.
The following table describes the mapping between the threshold weight of the shared buffer on the queue. It also
shows the percentage of the available shared buffer used by the queues for each of the corresponding threshold
weights of the shared buffer:
shared-
threshold-
weight on the
queue
Description heading
0 No dynamic sharing; shared buffer = 0.
1 0.77%
2 1.54%
3 3.03%
4 5.88%
Data Center Bridging (DCB) 107