3Com 1000 User Manual page 57

IFM is not available on a port which has full duplex
enabled:
If the Duplex Mode field in this screen is set to
Full Duplex, the Intelligent Flow Management
field is not displayed
In all other cases where the port has full duplex
enabled, IFM has no effect
Security Enable / Disable When Security is enabled,
the port enters single address learning mode. The
Switch removes all addresses currently stored in the
Switch Database against the port. The Switch then
learns the source address from the first packet it
receives on the port since Security was enabled.
Once the first address is learnt, no other endstation
is permitted to access the network through the port.
If an endstation with a different address attempts to
transmit packets onto the network through the
port, the port is automatically disabled and a trap is
generated. The port remains disabled until it is
enabled from the Port Setup screen or via SNMP
management.
A more comprehensive set of security features is
available through SNMP network management.
Security is not available on backbone ports. If the
port has been defined as a backbone port, the
Security field is not displayed.
Setting Up the Switch Ports
Disable Interactive Access Yes / No This field
allows you to disable the Interactive Access feature
of PACE (Priority Access Control Enabled) on the
current port. You should disable Interactive Access
on a port if:
The port is connected to a repeater
The port is connected to a device with Interac-
tive Access enabled
For more information about the Interactive Access
feature, refer to "Setting Up the Switch Unit"
page 4-9.
VLT Mode Enable / Disable This field allows you to
specify whether the port is a VLT (Virtual LAN Trunk)
port. A Virtual LAN Trunk (or VLT) is a
Switch-to-Switch link which carries traffic for all the
VLANs on each Switch. To create a VLT, the ports on
both ends of the link must be VLT ports. For more
information about VLTs, refer to
Switch" on page 5-3.
If the port uses AutoSelect VLAN Mode (refer to
the VLAN Configuration Mode field), you cannot
specify that the port is a VLT port.
4-13
on
"VLANs and the