Administrator Guide

Usage Information
Configure the maximum buffer available for PFC traffic. You can choose to increase or decrease the buffer size that is
allocated in the system by default. However, if you modify the PFC buffer size lower than the previously configured
size, the system determines whether this reduction in size is valid without disrupting the existing configuration. In such
a scenario, disable and re-enable DCB.
The lossless queue limit per port is validated based on the dcb pfc-queues command. PFC queue configuration
identifies the maximum number of queues a port can support. Although the queue limit per port is a baseline when
dynamic buffering is enabled, the limit per port for queues depends on the availability of the buffer.
Example
DellEMC(conf)#dcb pfc-total-buffer-size 2800
DellEMC(conf)#
DellEMC#show dcb
DCB Status: Enabled, PFC Queue Count: 2
Total Buffer: Total available buffer excluding the buffer pre-allocated
for guaranteed services like global headroom, queue's min
guaranteed buffer and CPU queues.
PFC Total Buffer: Maximum buffer available for lossless queues.
PFC Shared Buffer: Buffer used by ingress priority groups for shared usage.
PFC Headroom Buffer: Buffer used by ingress priority group for shared headroom usage.
PFC Available Buffer: Current buffer available for new lossless queues to be
Provisioned.
stack-unit Total Buffer PFC Total Buffer PFC Shared Buffer PFC Headroom Buffer PFC Available Buffer
PP (KB) (KB) (KB) (KB) (KB)
-----------------------------------------------------------------------------------------------------
1 0.0 3399 2800 1040 1040 711
1 0.1 3399 2800 1040 1040 720
1 0.2 3399 2800 1040 1040 711
1 0.3 3399 2800 1040 1040 720
DellEMC#
DellEMC(conf)#dcb pfc-total-buffer-size 2000
% Error: Total buffer size should not be less than the buffer consumed already
in the system
DellEMC(conf)#
show running-config dcb-buffer-threshold
Displays the DCB buffer threshold details in the running configuration.
Syntax
show running—config dcb-buffer-threshold
Command Modes
EXEC
EXEC Privilege
Command History
This guide is platform-specific. For command information about other platforms, see the relevant Dell EMC
Networking OS Command Line Reference Guide.
Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S6100-ON.
9.8(1.0) Introduced on the Z9100–ON.
9.7(0.0) Introduced on the S6000-ON and Z9500.
9.3(0.0) Introduced on the S6000 platform.
Usage Information
The following table describes the output fields displayed for the show running-config dcb-buffer-
threshold command:
Data Center Bridging (DCB) 513