Users Guide

Version Description
9.3(0.0) Introduced on the S4810, S4820T, S6000, and MXL platforms.
Usage Information
You must apply this buer policy at the interface level for the attributes to be applicable in conjunction with the
DCB input policy.
For each QoS policy buer, you can specify the shared buer threshold limit, the ingress buer size, buer limit for
pausing the acceptance of packets, and the buer oset limit for resuming the acceptance of received packets.
When PFC detects congestion on a queue for a specied priority, it sends a pause frame for the 802.1p priority
trac to the transmitting device.
You can use set up both the administrative and peer-related PFC priorities. For example, you can congure the
intended buer conguration for all 8 priorities. If you congure the number of lossless queues as 4 and if the
administrator-congured priorities congured within the DCB input policy is applied, then the conguration 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 eective for buer conguration. This method of conguration
provides an easy and exible technique to accommodate both administratively-congured and peer-congured
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 buer-threshold (Interface Conguration)
Assign the DCB policy to the DCB buer threshold prole on interfaces. This setting takes precedence over the global buer-threshold
setting.
Syntax
dcb-policy buffer-threshold profile-name
Parameters
buer-threshold Congure the prole name for the DCB buer threshold
prole-name Enter the name of the prole, which can be a string of up to 32 characters in length.
Default None
Command Modes INTERFACE mode
Command History
This guide is platform-specic. 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.
9.3(0.0) Introduced on the S4810, S4820T, and S6000 platforms.
Usage Information You can congure up to a maximum of four lossless (PFC) queues. By conguring four lossless queues, you can
congure four dierent priorities and assign a particular priority to each application that your network is used to
502 Data Center Bridging (DCB)