Virtual LANs (VLANs) 5-9
■AutoSelect — The port uses AutoSelect VLAN
Mode. For more information about AutoSe-
lect VLAN Mode, refer to “Using AutoSelect
VLAN Mode” on page 5-3. For information
about how to configure VLANs using AutoSe-
lect VLAN Mode, refer to “Setting Up VLANs
Using AutoSel ect VLAN Mode” on page 5-11.
VLAN Membership This field displays the ID of
the VLAN(s) to which the port belongs.
Port ID 1 / 2 / 3 / ... 24 / 25 / 26 (3C16900A)
1 / 2 / 3 /... 12 / 13 / 14 (3C16901A) This field dis-
plays the ID of the port currently selected in the list-
box.
VLAN ID 1 / 2 / 3 / ... 16 If the port specified in the
Port ID field uses Port VLAN Mode, this field allows
you to enter the ID of the VLAN to which the port is
to be assigned. If the port uses AutoSelect VLAN
Mode, you cannot specify the VLAN ID. By default,
all ports use Port VLAN Mode and belong to the
Default VLAN (VLAN 1). This field is not displayed if
the port is a VLT port.
If you are using AutoSelect VLAN Mode, you cannot
use VLAN 15. Also, if you are using the Spanning
Tree Protocol, you cannot use VLAN 16. In these
cases, the relevant VLANs are used internally by the
Switch and are therefore not available.
Backbone Port Ye s / No If the port specified in the
Port ID field uses Port VLAN Mode, this field allows
you to specify whether the port is a backbone port.
If the port uses AutoSelect VLAN Mode or is the
standby port of a resilient link pair, you cannot spec-
ify that it is a backbone port.
Each VLAN can have one backbone port. By default,
all ports belong to the Default VLAN (VLAN 1);
because of this, an unconfigured Switch unit can
only have one backbone port.
If you specify that an ATM OC-3c Module port is a
backbone port, the port becomes a backbone port
for all the VLANs on which it is active. It cannot be
the backbone port for one VLAN and a standard
port for another.
If you fit a Plug-in Module into a Switch with no
specified backbone ports, the Module automatically
becomes the backbone port for the Default VLAN
when you power up or initialize the Switch. If a
Switch has no Plug-in Module, but you fit a Trans-
ceiver Module, this becomes the backbone port for
the Default VLAN when you power up or initialize
the Switch.
APPLY This button applies any changes to the VLAN
database.
ATM LEC Setup If the port is an ATM OC-3c
Module port, this button allows you access the
VLAN LEC Setup screen for extending your VLANs
into an ATM network. For more information, refer
to the “SuperStack II Switch ATM OC-3c Module
User Guide”.