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MULTILINK ML2400 ETHERNET COMMUNICATIONS SWITCH – INSTRUCTION MANUAL 11–1
Multilink ML2400
Ethernet Communications Switch
Chapter 11: VLAN Registration
over GARP
GE Consumer & Industrial
Multilin
VLAN Registration over GARP
11.1 Overview
11.1.1 Description
The Generic Attribute Registration Protocol (GARP) and VLAN registration over GARP is
called GVRP. GVRP is defined in the IEEE 802.1q and GARP in the IEEE 802.1p standards. To
utilize the capabilities of GVRP, GE Multilin recommends that the user become familiar with
the concepts and capabilities of IEEE 802.1q.
11.1.2 GVRP Concepts
GVRP makes it easy to propagate VLAN information across multiple switches. Without
GVRP, a network administrator has to go to each individual switch and enable the
necessary VLAN information or block specific VLANs so that the network integrity is
maintained. With GVRP, this process can be automated.
It is critical that all switches share a common VLAN. This VLAN typically is the default VLAN
(VID=1) on most switches and other devices. GVRP uses “GVRP Bridge Protocol Data Units”
(“GVRP BPDUs”) to “advertise” static VLANs. We refer to GVRP BPDU is as an
“advertisement”.
GVRP enables the MultiLink family of switches to dynamically create 802.1q-compliant
VLANs on links with other devices running GVRP. This enables the switch to automatically
create VLAN links between GVRP-aware devices. A GVRP link can include intermediate
devices that are not GVRP-aware. This operation reduces the chances for errors in VLAN
configuration by automatically providing VLAN ID (VID) consistency across the network.
GVRP can thus be used to propagate VLANs to other GVRP-aware devices instead of
manually having to set up VLANs across the network. After the switch creates a dynamic
VLAN, GVRP can also be used to dynamically enable port membership in static VLANs
configured on a switch.