3Com SuperStack II Switch 3000 10/100, User Manual

Page: 55 / 150

Setting Up the Switch Ports 4-13
IFM should be disabled if the port is connected to a
repeated segment where the traffic is mainly local to
that segment.
IFM is not available on a port that has full duplex
enabled:
■
If the Speed/Duplex Mode field is set to 10Mbps
Full Duplex or 100Mbps Full Duplex, the Intelli-
gent Flow Management field is not displayed
■
In all other cases where the port has full duplex
enabled, IFM has no effect
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” on
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 “VLANs and the
Switch 3000 10/100” 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.
Speed/Duplex Mode Unit Default / Auto Negoti-
ated / 10Mbps Half Duplex / 10Mbps Full Duplex /
100Mbps Half Duplex / 100Mbps Full Duplex
This field allows you to specify the speed and
Duplex Mode of the port. The port speed can be
10Mbps or 100Mbps; the Duplex Mode can be full
or half duplex:
■
Full duplex allows frames to be transmitted and
received simultaneously and, in effect, doubles
the potential throughput of a link. In addition,
full duplex also supports 100BASE-FX cable runs
of up to 2km (6562ft). Full duplex is used for
point-to-point links between the Switch and
another device with full duplex support.
■
Half duplex is used if the port connects to a
shared Ethernet LAN segment, or if the device at
the other end of a point-to-point link does not
support full duplex.
The Speed/Duplex Mode field has the following set-
tings:
■
Unit Default — The speed and Duplex Mode of
the port is defined by the Speed/Duplex Mode
field in the Unit Setup screen. This is the default
setting.
■
Auto Negotiated — The speed and Duplex Mode
of the link is automatically detected, and the
speed and Duplex Mode of the port is set accord-
ingly.