Service Manual

Version Description
9.3(0.0) Introduced on the S6000, S4810, and S4820T.
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. For example, if you
modify the total buffer 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 configuration 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
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
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.
show running-config dcb-buffer-threshold
Displays the DCB buffer threshold details in the running configuration.
Syntax
show running—config buffer-threshold
Command Modes
EXEC
EXEC Privilege
Command
History
Version Description
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:
Field Description
Field Description
Profile name Name of the DCB buffer threshold profile
Priority The priority of the queue for which the buffer space settings apply
buffer-size Ingress buffer size
pause-threshold-
value
Buffer limit at which the port sends the pause to peer in KB.
resume-
threshold-value
Buffer offset limit at which the port resumes the peer in KB.
Example
Dell#show run buffer-threshold
!
dcb-buffer-threshold test1
pfc priority 0 buffer-size 40
Data Center Bridging (DCB) 479