3com WX2200 3CRWX220095A User Manual

Configuring and Managing Ports

Configuring Port

Operating

Parameters

Autonegotiation is enabled by default on a WX switch’s 10/100 Ethernet
ports and gigabit Ethernet ports.

You can configure the following port operating parameters:

Speed

Autonegotiation

Port state

PoE state

All ports on the WX4400 switches support full-duplex operating mode
only. They do not support half-duplex operation. Ports on the WX1200
switch support half-duplex and full-duplex operation.

3Com recommends that you do not configure the mode of a WX port so
that one side of the link is set to autonegotiation while the other side is
set to full-duplex. Although MSS allows this configuration, it can result in
slow throughput on the link. The slow throughput occurs because the
side that is configured for autonegotiation falls back to half-duplex. A
stream of large packets sent to a WX port in such a configuration can
cause forwarding on the link to stop.

You also can toggle a port’s administrative state and PoE setting off and
back on to reset the port.

10/100 Ports—Autonegotiation and Port Speed

WX 10/100 Ethernet ports use autonegotiation by default to determine
the appropriate port speed.

To explicitly set the port speed of a 10/100 port, use the following
command:

set port speed port-list {10 | 100 | auto}

If you explicitly set the port speed (by selecting an option other than
auto) of a 10/100 Ethernet port, the operating mode is set to full-duplex.

MSS allows the port speed of a gigabit port to be set to auto. However,
this setting is invalid. If you set the port speed of a gigabit port to auto,
the link will stop working.