3com 2226-SFP ユーザーズマニュアル

Configuring Port Settings

1000 Mbps connections are always full-duplex.
Half-duplex connections are only available for 10 Mbps
and 100 Mbps settings.

CAUTION: Before manually setting a port to
full-duplex, verify that the device connected to the port
is also manually set to the same speed and duplex
setting. If connecting link partners are left to
autonegotiate for a link manually set on this switch to
full-duplex, they will always negotiate to half-duplex,
resulting in a duplex mismatch. This can result in a
significant reduction in network performance. If you are
unsure of how to configure the speed/duplex setting,
simply enable autonegotiation for the port.

You cannot modify the speed/duplex settings of ports
that are members of a trunk or aggregated link.

Supported SFP transceivers only operate at 1000 Mbps
full-duplex. Inserting an SFP transceiver into a Gigabit
port only disables the corresponding RJ-45 port when
there is link on the SFP transceiver.

Disabling a port that is delivering power will not disable
the power being delivered to a connected device.

Link Aggregation

Link aggregation, also called “trunking”, refers to
bonding multiple ports into a single group to effectively
combine the bandwidth into a single connection or a
“trunk”. If you are connecting the Switch to another

switch or to an Internet backbone, you can aggregate
links on the Switch to increase throughput and prevent
packet loopback between switches.

For link aggregation to work, the trunks must be
configured on both ends (switches).

Four tabs are available on the Port Link Aggregation
page:

■

Summary

■

Create

■

Modify

■

Remove

Guidelines for Creating Trunks

■

Any port on the Switch can be used for creating a
trunk.

■

The Switch supports a maximum of four trunks.

■

Each trunk may contain up to eight members.

■

A port may only be a member of one trunk at any
one time.

■

All ports in a trunk must be configured in an
identical manner, including communication mode
(that is, speed, duplex mode and flow control).

■

Both 10/100 and Gigabit ports cannot be combined
as members in a single trunk.