Service Manual

Buffer threshold parameters:
pfc priority 0 buffer-size 40
pfc priority 3 buffer-size 50
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(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. 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.
512 Data Center Bridging (DCB)