3com 3C16491 Manuel D’Utilisation
56
C
HAPTER
4: C
ONFIGURING
THE
S
WITCH
1000 Mbps connections are always full-duplex.
Half-duplex connections are only available for
10 Mbps and 100 Mbps settings.
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.
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.
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 disables the
corresponding RJ-45 port, even if no fiber cable
is inserted.
1000 Mbps full-duplex. Inserting an SFP
transceiver into a gigabit port disables the
corresponding RJ-45 port, even if no fiber cable
is inserted.
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.
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).
be configured on both ends (switches).
Guidelines for Creating Trunks
■
Any port on the Switch can be used for
creating a trunk.
creating a trunk.
■
This switch supports a maximum of four
trunks.
trunks.
■
Each trunk may contain up to four
members.
members.
■
A port may only be a member of one trunk
at any one time.
at any one time.