3com 2816 Guida Utente
Configuring VLANs
33
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.
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.
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.
Advanced Port Configuration
Use the Advanced Port Configuration tab to set the
Switch’s broadcast storm control and threshold limits.
A broadcast storm is an incorrect packet sent out on a
network that causes most hosts to respond all at once,
typically with wrong answers that start the process over
again. Broadcast storms use substantial network
bandwidth and may cause network time-outs.
network that causes most hosts to respond all at once,
typically with wrong answers that start the process over
again. Broadcast storms use substantial network
bandwidth and may cause network time-outs.
Advanced settings include:
■
Broadcast Storm Control – Enables and disables
broadcast storm control
broadcast storm control
■
Packet Rate Threshold – Sets the broadcast storm
threshold. Available options include 500,1000,1500,
5000, 10000, and 15000 bytes per packet.
threshold. Available options include 500,1000,1500,
5000, 10000, and 15000 bytes per packet.
Figure 13 Advanced Port Configuration Page
Default Port Settings
If you do not configure the Switch’s port settings, the
ports will use the following default settings:
ports will use the following default settings:
■
All ports are enabled
■
Autonegotiation is enabled
■
Flow control is enabled
■
All ports are set to priority Standard
Configuring VLANs
A virtual LAN (VLAN) is a collection of network nodes
that share the same collision domain, regardless of their
physical location or connection point in the network. A
that share the same collision domain, regardless of their
physical location or connection point in the network. A