Users Guide

Version Description
9.7(0.0) Introduced on the S6000-ON.
9.3(0.0) Introduced on the S4810, S4820T, and S6000 platforms.
Usage Information
For each priority, you can specify the shared buffer threshold limit, the ingress buffer
size, buffer limit for pausing the acceptance of packets, and the buffer offset limit for
resuming the acceptance of received packets. When PFC detects congestion on a
queue for a specified priority, it sends a pause frame for the 802.1p priority traffic to the
transmitting device.
You can use the priority command to set up both the administrative and peer-
related PFC priorities. For example, you can configure the intended buffer configuration
for all eight priorities. If you configure the number of lossless queues as 4 and if the
administrator-configured priorities configured within the DCB input policy is applied,
then the configuration for those priorities are pre-designed. However, if the peer-
provided priorities are applied, although a DCB input policy is present, the peer-
provided priorities become effective for buffer configuration. This method of
configuration provides an easy and flexible technique to accommodate both
administratively-configured and peer-configured priorities.
Example
Dell(conf-dcb-buffer-thr)# priority 0 buffer-size 52 pause-
threshold 16 resume-offset 10 shared-threshold-weight 7
qos-policy-buffer
Create a QoS policy buffer and enter the configuration mode to configure the no-drop queues, ingress buffer
size, buffer limit for pausing, and buffer offset limit for resuming.
Syntax
qos-policy-buffer queue queue-num pause no-drop queue buffer-size
size pause-threshold threshold-value resume-offset threshold-value
shared-threshold-weight size
Parameters
policy-name Name of the QoS policy buffer that is applied to an interface for
this setting to be effective in conjunction with the DCB input
policy. You can specify the shared buffer threshold limit, the
ingress buffer size, buffer limit for pausing the acceptance of
packets, and the buffer offset limit for resuming the acceptance
of received packets. This method of configuration enables
different peer-provided and administrative priorities to be set up
because the intended queue is directly configured instead of
determining the priority to queue mapping for local and remote
parameters.
queue 0 to queue
7
Specify the queue number to which the QoS policy buffer
parameters apply
Data Center Bridging (DCB) 645