3Com SuperStack II Guide

Configuring the Current Switch 63
HD Flow Control
Enabled
/ Disabled
Allows you to enable or disable the Intelligent Flow Management flow
control that can be used when the port is operating in half duplex. Flow
control prevents any packet loss that may occur on congested ports.
The Half Duplex Flow Control listbox should be disabled if the port is
connected to multiple devices using a hub. If it is enabled, local traffic
between those multiple devices is inhibited.
802.1p Multicast Learning
Stack Default
/ Disabled
Allows you to specify whether the port uses IEEE 802.1p multicast
filtering (GMRP) to filter and forward multicasts automatically:
■
Stack Default
— The port takes the 802.1p multicast learning setting
from the Advanced Stack Setup page. For more information, see
“Configuring the Advanced Stack Settings”
on page 76.
■
Disabled
— The port does not use IEEE 802.1p multicast filtering. Use
this setting if the device at the other end of the link does not support
IEEE 802.1p.
For more information about IEEE 802.1p multicast filtering, see
“Multicast Filtering”
on page 189.
Untagged VLAN
Allows you to specify a single VLAN to which the port belongs. For more
information about VLANs, see “Virtual LANs (VLANs)”
on page 163.
If you want to move a port from the Default VLAN (VLAN 1) to another
VLAN, that VLAN must have information defined for it. If you select a
VLAN in the Untagged VLAN listbox that does not have information
defined for it (that is, one that has the description
Unassigned
) and you
then click the
Apply
button, the Create VLAN page is displayed allowing
you to enter information for that VLAN. Once you have entered the VLAN
information, the Port Setup page is re-displayed and the port is placed in
the VLAN. For information about the Create VLAN page, see
“Defining
VLAN Information”
on
page 84
.
If the port at the other end of the link supports VLT or 802.1Q tagging,
you can specify that the port belongs to multiple VLANs. To specify that
the port belongs to multiple VLANs using VLT tagging, set the VLT
Tagging listbox to
Enable
. To specify that the port belongs to multiple
VLANs using 802.1Q tagging, see
“Placing a Port in Multiple VLANs”
on
page 166
.

3Com SuperStack II Specifications

General

Brand	3Com
Model	SuperStack II
Category	Switch
Language	English