Users Guide

88 Switch Feature Overview
Back Pressure Support
On half-duplex links, a receiver may prevent buffer overflows by jamming the
link so that it is unavailable for additional traffic. On full-duplex links, a
receiver may send a PAUSE frame indicating that the transmitter should
cease transmission of frames for a specified period.
When flow control is enabled, the Dell EMC Networking N-Series switches
will observe received PAUSE frames or jamming signals, but will not issue
them when congested.
Auto-negotiation
Auto-negotiation allows the switch to advertise modes of operation. The
auto-negotiation function provides the means to exchange information
between two switches that share a point-to-point link segment and to
automatically configure both switches to take maximum advantage of their
transmission capabilities.
Dell EMC Networking N-Series switches enhance auto-negotiation by
providing configuration of port advertisement. Port advertisement allows the
system administrator to configure the port speeds that are advertised.
For information about configuring auto-negotiation, see "Port
Characteristics" on page 631.
Storm Control
When Layer-2 frames are processed, broadcast, unknown unicast, and
multicast frames are flooded to all ports on the relevant virtual local area
network (VLAN). The flooding occupies bandwidth and loads all nodes
connected on all ports. Storm control limits the amount of broadcast,
unknown unicast, and multicast frames accepted and forwarded by the
switch.
For information about configuring Broadcast Storm Control settings, see
"Port-Based Traffic Control" on page 907.
NOTE: Dell EMC Networking N2000/N2100-ON/N3000E-ON/N3100-ON Series
switches do not support half-duplex operation.