Service Manual

threshold-value Buffer limit at which the port sends the pause to peer in KB. Enter a number in the range
of 0 to 7787. The default is 10 KB.
resume-offset Buffer offset limit for resuming in KB
threshold-value Buffer offset limit at which the port resumes the peer in KB. Enter a number in the range
of 1 to 7787. The default is 10 KB.
shared-threshold-
weight
Buffer shared threshold weight
size Weightage of the priorities on the shared buffer size in the system. Enter a number in the
range of 0 to 9. The default shared threshold weight is 10.
Default The default size of the ingress buffer is 45 KB. The default buffer limit at which the port sends the pause to peer
and recommences the sending of packets to the peer is 10 KB. The default threshold weight of the shared buffer
space is 10.
Command Modes DCB-BUFFER-THRESHOLD 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 For each priority, 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. When
PFC detects congestion on a queue for a specified priority, it sends a pause frame for the 802.1p priority traffic to
the transmitting device.
You can use thepriority command to set up both the administrative and peer-related PFC priorities. For
example, you can configure the intended buffer configuration for all 8 priorities. If you configure the number of
lossless queues as 4 and if the administrator-configured priorities configured within the DCB input policy is applied,
then the configuration for those priorities are pre-designed. However, if the peer-provided priorities are applied,
although a DCB input policy is present, the peer-provided priorities become effective for buffer configuration. This
method of configuration provides an easy and flexible technique to accommodate both administratively-configured
and peer-configured priorities.
Example
Dell (conf-dcb-buffer-thr)#priority 0 buffer-size 52 pause-threshold 16 resume-
offset 10 shared-threshold-weight 7
pfc mode on
Enable the PFC configuration on the port so that the priorities are included in DCBX negotiation with peer PFC devices.
Syntax
pfc mode on
To disable the PFC configuration, use the no pfc mode on command.
Defaults PFC mode is on.
Command Modes DCB MAP
Command History
Version 9.2(0.0) Introduced on the M I/O Aggregator.
Version 8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
374 Data Center Bridging (DCB)