Terms and Definitions
Fixed Switch Configuration Guide 9-15
Forwarding List A list of the ports on a particular device that are eligible to transmit frames for a
selected VLAN.
GARP Multicast
Registration
Protocol (GMRP)
A GARP application that functions in a similar fashion as GVRP, except that GMRP
registers multicast addresses on ports to control the flooding of multicast frames.
GARP VLAN
Registration
Protocol (GVRP)
A GARP application used to dynamically create VLANs across a switched network.
Generic Attribute
Registration
Protocol (GARP)
GARP is a protocol used to propagate state information throughout a switched
network.
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.
Tag Header (VLAN
Tag)
Four bytes of data inserted in a frame that identifies the VLAN/frame classification.
The Tag Header is inserted into the frame directly after the Source MAC address
field. Twelve bits of the Tag Header represent the VLAN ID. The remaining bits are
other control information.
Tagged Frame A data frame that contains a Tag Header. A VLAN aware device can add the Tag
Header to any frame it transmits.
Untagged Frame A data frame that does not have a Tag Header.
VLAN ID A unique number (between 1 and 4094) that identifies a particular VLAN.
VLAN Name A 32-character alphanumeric name associated with a VLAN ID. The VLAN Name is
intended to make user-defined VLANs easier to identify and remember.
Table 9-3 VLAN Terms and Definitions (continued)
Term Definition
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