Reference Guide

Example
Dell# show qos dcb-map dcbmap2
State :Complete
PfcMode:ON
--------------------
PG:0 TSA:ETS BW:50 PFC:OFF
Priorities:0 1 2 4 5 6 7
PG:1 TSA:ETS BW:50 PFC:ON
Priorities:3
Applying a DCB Map in a Switch Stack
Apply the same DCB map with PFC and ETS configuration to all stacked ports in a switch stack. You
cannot apply different DCB maps to different stacked switches. This functionality is supported on the
platform.
To remove all PFC and ETS settings applied to stacked ports from the DCB map and reset PFC and ETS to
their default settings, use the no dcb-map stack-unit all command.
Task Command Command Mode
Apply the specified DCB map on all
ports of the switch stack.
dcb-map stack-unit all
stack-ports all dcb-map-
name
CONFIGURATION
dcb pfc-shared-buffer-size
Configure the maximum amount of shared buffer size for PFC packets in kilobytes. This utility is
supported on the
S4820T platform.
You must configure the shared buffer size to be less than the total PFC buffer size. If the buffer size and
DCB buffer threshold settings are applied on one or more ports, a validaiton is performed to determine
whether following condition is satisfied: Shared-pfc-buffer-size <= (Total-pfc-buffer-size - Σpfc priority
<> buffer-size on each port, priority).
If the preceding condition is not satisfied by the shared PFC buffer size value, the configuration is not
saved and a system logging message is generated stating that the shared buffer size that you attempt to
specify cannot be configured because of the existing total buffer space on the system being lower than
the shared buffer size. You must either enter a smaller value for the shared buffer size or increase the
total buffer size appropriately by using the dcb pfc-total- buffer-size command.
Syntax
dcb pfc-shared—buffer—size KB
Parameters
KB Enter a number in the range of 0 to 7787.
Default The default is 1 KB for S6000 platforms.
576
Data Center Bridging (DCB)