Command Reference Guide

148 ● duplex 3Com Router 5000 Family and Router 6000 Family
Command Reference
duplex
Purpose Use the duplex command to set the operating mode of the Ethernet interface.
Use the undo duplex command to restore the default operating mode of the
Ethernet interface.
Syntax duplex { full | half | negotiation }
undo duplex
Parameters full
Sets the Ethernet interface to work in full duplex.
half
Sets the Ethernet interface to work in half duplex.
negotiation
Sets the Ethernet interface to work in auto-negotiation
mode.
Default By default, the Ethernet interface is working in auto-negotiation mode.
Example Set the Ethernet interface to work in full duplex.
[3Com -Ethernet0/0/0] duplex full
View This command can be used in the following views:
■ Ethernet Interface view
Description Connected to a hub, the Ethernet interface on a router must be specified to work in
half-duplex mode. Connected to a network device supporting full-duplex, a LAN
Switch for example, it must be specified to work in full-duplex mode, however.
Note that FE and GE electrical interfaces can support both full-duplex and half-duplex,
whereas FE and GE optical interfaces can only work in full-duplex mode.
Before setting the Ethernet interface to work in auto-negotiation mode, you must
make sure that the connected remote end has been working in auto-negotiation
mode. If this cannot be guaranteed, the two parties are recommended to use the
forced setting for the consistency in operating mode.
Related Commands ■ speed
■ display interface