Users Guide

Version Description
9.7(0.0) Introduced on the S6000-ON and Z9500.
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
dcb-policy buffer-threshold (Interface
Configuration)
Assign the DCB policy to the DCB buffer threshold profile on interfaces. This setting takes precedence over the global buffer-
threshold setting.
Syntax
dcb-policy buffer-threshold profile-name
Parameters
buffer-threshold Configure the profile name for the DCB buffer threshold
profile-name Enter the name of the profile, which can be a string of up to 32 characters in
length.
Default None
Command Modes INTERFACE mode
Command History
This guide is platform-specific. For command information about other platforms, see the relevant Dell
Networking OS Command Line Reference Guide.
Version Description
9.8(1.0) Introduced on the Z9100–ON.
9.7(0.0) Introduced on the S6000-ON and Z9500.
Data Center Bridging (DCB) 511