Dell Networking S4810, Reference Manual

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dcb pfc-shared-buffer-size
Configure the maximum amount of shared buffer size for PFC packets in kilobytes. This utility is
supported on the S4810 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 -
Σ pfc 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.
Command
Modes CONFIGURATION mode
Command
History
Version 9.3(0.0) Introduced on the S4810, S4820T, and S6000 platforms.
Usage
Information Configure the maximum shared buffer available for PFC traffic. You can choose to
increase or decrease the shared buffer that is currently allocated in the system by
default. 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 validation is performed to determine whether following condition
is satisfied:
Shared-pfc-buffer-size <= (Total-pfc-buffer-size -
Σ
pfc 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 as follows:
Dell(conf)#dcb pfc-shared-buffer-size 2000
%ERROR: pfc shared buffer size configured cannot accommodate
existing buffer requirement in the system.
Example
Dell(conf)#dcb pfc-shared-buffer-size 5000
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Data Center Bridging (DCB)