Users Guide

Command History
This guide is platform-specic. For command information about other platforms, see the relevant Dell Networking
OS Command Line Reference Guide.
Version Description
9.7(0.0) Introduced on the S6000-ON and Z9500.
9.3(0.0) Introduced on the S6000 platform.
dcb pfc-total-buer-size
Congure the total buer size for PFC in kilobytes.
Syntax
dcb pfc-total—buffer—size buffer-size
Parameters
buer-size Enter a number in the range of 0 to 7787.
Default The default is 6592KB.
Command Modes CONFIGURATION mode
Command History
This guide is platform-specic. For command information about other platforms, see the relevant Dell Networking OS Command Line Reference
Guide.
Version Description
9.8(1.0) Introduced on the Z9100–ON.
9.8(0.0P5) Introduced on the S4048–ON.
9.7(0.0) Introduced on the S6000-ON.
9.6(0.0) Introduced on the S5000.
9.3(0.0) Introduced on the S6000, S4810, and S4820T.
Usage Information
Congure the maximum buer available for PFC trac. You can choose to increase or decrease the buer size that is allocated in the system by
default. However, if you modify the PFC buer size lower than the previously congured size, the system determines whether this reduction in
size is valid without disrupting the existing conguration. 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 conguration identies the maximum
number of queues a port can support. Although the queue limit per port is a baseline when dynamic buering is enabled, the limit per port for
queues depends on the availability of the buer.
Example
Dell(conf)#dcb pfc-total-buffer-size 2800
Dell(conf)#
Also, show dcb showing the total buffer can be added.
Dell#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.
Data Center Bridging (DCB) 511