Users Guide

Table Of Contents
pause-negotiation is disabled. 40-gigabit Ethernet interfaces do not support pause-
negotiation
monitor Enter the keyword monitor then the session-ID to enable mirror flow control
frames on the interface. The range is from 0 to 65535.
Defaults rx on tx off
Command Modes INTERFACE
Command
History
This guide is platform-specific. For command information about other platforms, see the relevant Dell
EMC Networking OS Command Line Reference Guide.
Version Description
9.11(0.0) Added support for monitor session.
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S3148.
9.10(0.0) Introduced on the S6100ON.
9.8(2.0) Introduced on the S3100 series.
9.8(1.0) Introduced on the Z9100ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.6.0.0 Added support for the negotiate feature on the S4810 and S4820T.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
8.1.1.0 Introduced on the E-Series.
6.5.1.9 and
7.4.1.0
Introduced on the E-Series.
7.8.1.0 Introduced on the C-Series and S-Series with the thresholds option.
Usage
Information
The globally assigned 48-bit multicast address 01-80-C2-00-00-01 is used to send and receive pause
frames. To allow full-duplex flow control, stations implementing the pause operation instruct the MAC to
enable the reception of frames with a destination address equal to this multicast address.
When a port receives traffic at a higher rate than it can process, the frames are stored in the port
buffer. As a result, buffer usage increases. When the buffer usage reaches the value specified in the
pause-threshold argument, the port sends PAUSE frame to the connected link partner to stop sending
the traffic. Eventually this reduces the buffer usage. When the buffer usage drops by the value specified
in the resume-threshold, the port again sends a PAUSE frame with 0 as wait-time. This results in
resume of the paused traffic flow.
Important Points to Remember
Do not enable tx pause when buffer carving is enabled. For information and assistance, consult Dell
EMC Networking TAC.
The only configuration applicable to half duplex ports is rx off tx off. The following error is
returned:
Cant configure flowcontrol when half duplex is configure, config ignored
Half duplex cannot be configured when the flow control configuration is on (default is rx on tx
on). The following error is returned:
Interfaces 681