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 KB
Parameters
KB 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(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. For example, if you modify the total
buer size as 4000 KB from the previous size of 5000 KB, an error message is displayed that this reduction
cannot be performed owing to existing system conguration because of queues that are being currently in
process.
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 5000
Dell(conf)# dcb pfc-total-buffer-size 4000
%ERROR: Total pfc buffer size configured cannot accommodate existing
buffer requirement in the system.
526
Data Center Bridging (DCB)