3com 2226 PLUS Guida Utente
Configuring VLANs
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Click Apply to save your settings.
To configure another port, click Port Configuration on
the menu again, and then click the port number that
you want to configure.
the menu again, and then click the port number that
you want to configure.
Speed/Duplex for 1000 Mbps Connections
You cannot preset the speed to 1000Mbps.
To run a
port at 1000Mbps, you must enable autonegotiation
for the port. When autonegotiation is enabled, the
Switch will automatically connect at 1000Mbps, pro-
viding the connected device also supports this speed.
for the port. When autonegotiation is enabled, the
Switch will automatically connect at 1000Mbps, pro-
viding the connected device also supports this speed.
1000Mbps connections are always full-duplex.
Half-duplex connections are only available for
10Mbps and 100Mbps settings.
Half-duplex connections are only available for
10Mbps and 100Mbps 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 set-
ting, 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 set-
ting, simply enable autonegotiation for the port.
You cannot modify the speed/duplex settings of ports
that are members of a trunk or aggregated link.
that are members of a trunk or aggregated link.
Supported SFP transceivers only operate at 1000Mbps
full-duplex. Inserting an SFP transceiver into a gigabit
port disables the corresponding RJ-45 port, even if no
fiber cable is inserted.
full-duplex. Inserting an SFP transceiver into a gigabit
port disables the corresponding RJ-45 port, even if no
fiber cable is inserted.
Configuring VLANs
You can use the Switch to create VLANs to organize
any group of ports into separate broadcast domains.
VLANs confine broadcast traffic to the originating
group and help eliminate broadcast storms in large
networks. This also provides for a more secure and
cleaner network environment.
any group of ports into separate broadcast domains.
VLANs confine broadcast traffic to the originating
group and help eliminate broadcast storms in large
networks. This also provides for a more secure and
cleaner network environment.
You can create up to 64 VLANs, add specific ports to
a chosen VLAN (so that the port can only communi-
cate with other ports on the VLAN), or configure a
port make it a member of all VLANs.
a chosen VLAN (so that the port can only communi-
cate with other ports on the VLAN), or configure a
port make it a member of all VLANs.
Speed Duplex
Sets the preferred speed and duplex mode
for the port. This option is only available
when autonegotiation for the port is dis-
abled. Available speed and duplex modes
include:
for the port. This option is only available
when autonegotiation for the port is dis-
abled. Available speed and duplex modes
include:
■
10Mbps Half
■
10Mbps Full
■
100Mbps Half
■
100Mbps Full
■
1000Mbps Full (for ports 25 and 26
only) – See
only) – See
on
.
Flow Control
When enabled, controls packet flow so
that a sending device does not transmit
more packets than a receiving device can
process.
that a sending device does not transmit
more packets than a receiving device can
process.
If flow control is disabled, packets may be
dropped under certain periods of high traf-
fic loads.
dropped under certain periods of high traf-
fic loads.
By default, flow control is enabled.
Option
Description