Users Guide

Network Administration: Port Settings 163
FILE LOCATION: C:\Users\gina\Desktop\Checkout_new\Dell Astute\User
Guide\Dell_Astute_Network_Admin_PortSettings.fm
DELL CONFIDENTIAL – PRELIMINARY 8/9/16 - FOR PROOF ONLY
Flow Control
The device supports 802.3x flow control for ports configured to Full Duplex
mode. By default, this feature is enabled on all ports, and it can be disabled
per port.
Flow control creates a lossless link with no packet loss. The flow control
mechanism enables the receiving side to signal to the transmitting side that
transmission must temporarily be halted to prevent buffer overflow. This
signaling is done by sending PAUSE frames. The ports that receive pause
frames stops transmitting traffic.
Flow control on the device works in Receive-Only mode, meaning that the
interfaces with enabled flow control receive PAUSE frames, but do not send
them.
When flow control is enabled, the system buffers are allocated per port so
that if the buffers of one port are consumed, other ports will still have their
free buffers.
Back Pressure
The device supports back pressure for BaseT copper ports configured to Half
Duplex mode. By default, this feature is disabled, and it can be enabled per
port. The back-pressure mechanism prevents the sender from transmitting
additional traffic temporarily. The receiver may occupy a link so it becomes
unavailable for additional traffic.
Back Pressure is supported on all SKUs except for X4012.
Port Default Settings
Table 10-1 describes the port default settings.
Table 10-1. Port Default Settings
Function Default Setting
Port speed and mode 1G ports default speed: 1G
10G port default speed: 10G
Port forwarding state Enabled
Port tagging All ports are members of VLAN 1 as untagged
Flow Control Enabled
Back Pressure Disabled