3Com Switch 4200G Configuration Guide

Configuring Ethernet Ports 69
Configuring Ethernet
Ports
Making Basic Port
Configuration
To use the optical interface on a combo port, install the SFP and issue the undo
shutdown command in the interface. The corresponding 10/100/1000BASE-T port
will automatically be shutdown.
The speed and mdi commands are not available on the combo port.
The mdi command is not available on the Ethernet ports of the expansion interface
card.
Setting the Ethernet
Port Broadcast
Suppression Ratio
You can use the broadcast-suppression commands to restrict the broadcast traffic
allowed to pass through a port. After that, if the broadcast traffic on the port exceeds
the value you set, the system will maintain an appropriate broadcast traffic ratio by
discarding the overflow traffic, so as to suppress broadcast storm, avoid network
congestion and ensure normal network services.
You can execute the broadcast-suppression command in system view or Ethernet
port view:
■ If you execute the command in system view, the command takes effect on all
ports.
Table 47 Make basic port configuration
Operation Command Remarks
Enter system view system-view —
Enter Ethernet port view interface interface-type
interface-number
—
Enable the Ethernet port undo shutdown By default, the port is
enabled.
Use the shutdown
command to disable the
port.
Allow jumbo frames to pass
through the Ethernet por
jumboframe enable Optional
The maximum ethernet
frame size supported is 9216
bytes.
Set the description of the
Ethernet port
description text By default, no description is
defined for an Ethernet port.
Set the duplex mode of the
Ethernet port
duplex { auto | full | half } The port defaults to auto
(autonegotiation) mode.
Set the rate of the Ethernet
port
speed { 10 | 100 | 1000 | auto } By default, the speed of the
port is set to auto mode.
Set the MDI attribute of the
Ethernet port
mdi { across | auto | normal }
Be default, the MDI attribute
of the port is set to auto
mode.