Users Guide

tx o Enter the keywords tx off so that ow control frames are not sent from this port to
the connected device when a higher rate of trac is received.
pause-threshold Enter the buer threshold limit for generating PAUSE frames.
resume-oset Enter the oset value for generating PAUSE frames to resume trac.
negotiate (Optional) Enter the keyword negotiate to enable the pause-negotiation with the
egress port of the peer device. If the negotiate command is not used, 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 ow control frames on
the interface. The range is from 0 to 65535.
Defaults rx o tx o
Command Modes INTERFACE
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
9.11(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 S6100–ON.
9.8(2.0) Introduced on the S3100 series.
9.8(1.0) Introduced on the Z9100–ON.
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.
9.2(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 ow 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 trac at a higher rate than it can process, the frames are stored in the port buer. As a
result, buer usage increases. When the buer usage reaches the value specied in the “pause-threshold”
argument, the port sends PAUSE frame to the connected link partner to stop sending the trac. Eventually this
Interfaces 667