API Guide

size Size of the ingress buffer in KB. Enter a number in the range of 0 to 7787. The default is
45 KB.
pause-threshold Buffer limit for pause frames to be sent
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 C9010.
9.7(0.1) Introduced on the S3048-ON and S4048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.3(0.0) Introduced on the S4810, S4820T, S6000, and MXL platforms.
Usage Information
You must apply this buffer policy at the interface level for the attributes to be applicable in conjunction with the
DCB input policy.
For each QoS policy buffer, 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 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)# qos-policy-buffer test
Dell(conf-qos-policy-buffer)#queue 0 pause no-drop buffer-size 128000 pause-
threshold 103360 resume-threshold 83520
Dell(conf-qos-policy-buffer)# queue 4 pause no-drop buffer-size 128000
pause-threshold 103360 resume-threshold 83520
Data Center Bridging (DCB) 539