Reference Guide

dot1p Value in the
Incoming Frame
Description heading
0 0
1 0
2 0
3 1
4 2
5 3
6 3
7 3
pfc priority
Configure the CoS traffic to be stopped for the specified delay.
S4820T
Syntax
pfc priority priority-range
To delete the pfc priority configuration, use the no pfc priority command.
Parameters
priority-range Enter the 802.1p values of the frames to be paused. Separate the
priority values with a comma; specify a priority range with a dash; for
example, pfc priority 1,3,5-7. The range is from 0 to 7.
Defaults none
Command Modes DCB INPUT POLICY
Command History
This guide is platform-specific. For command information about other platforms, refer to the
relevant FTOS Command Line Reference Guide .
The following is a list of the FTOS version history for this command.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.12.0 Introduced on the S4810.
Version 8.3.16.0 Introduced on the MXL 10/40GbE Switch IO Module.
Usage
Information
You can enable any number of 802.1p priorities for PFC. Queues to which PFC priority traffic is
mapped are lossless by default. Traffic may be interrupted due to an interface flap (going down
and coming up) when you reconfigure the lossless queues for no-drop priorities in a PFC input
policy and reapply the policy to an interface.
The maximum number of lossless queues supported on the switch is two.
A PFC peer must support the configured priority traffic (as DCBX detects) to apply PFC.
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