Terminology - 3Com corebuilder 3500 Implementation Manual

The following terms apply to VLANs:

Terminology

Default VLAN — The predefined port-based VLAN interface on your
system that always uses VID 1, the protocol type unspecified, and the
name Default. The default VLAN also initially includes all of the bridge
ports without any tagging, but you can modify the bridge ports and
tag status of the default VLAN. If you maintain the default VLAN and
you install a new module, the system adds all ports that are associated
with the new module to the default VLAN. See "The Default VLAN"
for more detailed information.
VLAN origin — Whether the VLAN was created in one of the
following ways:
VLAN mode — A system-wide mode that determines whether data
with a unicast MAC address can be forwarded between configured
VLANs (allOpen). In allClosed mode, each VLAN has its own address
table and data cannot be forwarded between VLANs (although data
can still be routed between VLANs). The default VLAN mode is
allOpen. See "VLAN allOpen or allClosed Mode" for more
information.
Ignore STP mode — A per-VLAN mode that determines whether the
system ignores the blocking Spanning Tree Protocol (STP) mode for the
ports of a designated VLAN. (One instance of STP runs on the system,
but you can disable it for each VLAN.) Ignore STP mode is only
available in allClosed mode; it is disabled by default. It allows the user
to select (for each VLAN) which VLANs ignore STP blocked ports. This
mode is typically used for VLANs that have router interfaces that
choose to ignore the STP state. It allows routing (or bridging) over a
port that is blocked by STP. See "Ignore STP Mode" later in this
chapter for more information.
Statically — The VLAN display shows an origin of static if you
define the VLAN.
Dynamically — The VLAN display shows an origin of GVRP if the
system learned the VLAN dynamically through GVRP.
Router — The VLAN display shows an origin of router if you have
defined a router port IP interface on a single bridge port. When
you define a router port IP interface, you must place the system in
allClosed mode. This removes any allOpen VLANs and re-creates
the default VLAN. See Chapter 11 for more information on
defining router port IP interfaces.
Key Concepts 161