3Com 3CBLSF50 User Guide - Page 63

Link Aggregation, Guidelines for Creating Trunks

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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 Configuring Port Settings 63 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.

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Configuring Port Settings
63
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.