Service Manual

Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.9(0.0) Introduced on the MXL 10/40GbE Switch IO Module.
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.
d.
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.
dcb-buffer-threshold
Configure the profile name for the DCB buffer threshold.
Syntax
dcb buffer—threshold profile-name
Parameters
profile-name Enter the name of the profile, which can be a string of up to 32 characters in length.
Default None
Command Modes CONFIGURATION mode
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.3(0.0) Introduced on the MXL platform.
Usage Information When you enter the profile name, you enter the DCB buffer threshold configuration mode. You can specify the
shared buffer threshold limit, the ingress buffer size, buffer limit for pausing the acceptance of packets, and the
buffer offset limit for resuming the acceptance of received packets.
Example
Dell(conf)#dcb buffer—threshold test
Example of
commands in dcb
buffer—
threshold mode
qos-policy-buffer queue queue-num pause no-drop queue buffer-size size pause-
threshold threshold-value resume-offset threshold-value shared-threshold-weight
size
Dell(conf)# qos-policy-buffer test
Dell(conf-qos-policy-buffer)#queue 0 pause no-drop buffer-size
390 Data Center Bridging (DCB)