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VLAN Terms
13-6 VLAN Operation and Network Applications
Default VLAN The VLAN to which all ports are assigned upon initialization.
The Default VLAN has a VLAN ID of 1 and cannot be deleted or
renamed.
Forwarding List A list of the ports on a particular device that are eligible to
transmit frames for a selected VLAN.
Port VLAN List A per port list of all eligible VLANs whose frames can be
forwarded out one specific port and the frame format (tagged or
untagged) of transmissions for that port. The Port VLAN List
specifies what VLANs are associated with a single port for frame
transmission purposes.
Filtering Database A database structure within the switch that keeps track of the
associations between MAC addresses, VLANs, and interface
(port) numbers. The Filtering Database is referred to when a
switch makes a forwarding decision on a frame.
1Q Connection
(previously referred to as a
1Q Trunk)
A connection between 802.1Q switches that passes only traffic
with a VLAN Tag Header inserted in each frame. All VLANs in
the port’s Port VLAN List are configured to transmit all frames
as tagged frames. The port will drop all incoming frames that do
not have a VLAN tag.
1D Connection This is a reference to a connection from a switch that passes only
untagged traffic. By default, a port designated to pass only
untagged frames has all VLANs on its Port VLAN List and is
configured to transmit all frames as untagged frames.
NOTE: The user cannot configure an interface to
receive only untagged frames.
Per VLAN Spanning Tree
Protocol (PVSTP)
A protocol used to create a separate Spanning Tree topology for
each VLAN configured in a switch.
Quick Convergence STP
(QCSTP)
A protocol that is compatible with PVSTP and provides
automatic topology changes at 1/10th the speed of PVSTP.
QCSTP is also backwards compatible with IEEE 802.1D.
Table 13-1 VLAN Terms and Definitions (Continued)
VLAN Term Definition