GVRP Configuration
Chapter 11. GVRP Configuration
11.1 Brief Introduction to GVRP
1. GARP
Generic Attribute Registration Protocol (GARP) provides a mechanism that allows
participants in a GARP application to distribute, propagate and register with other participants
in a bridged LAN that attributes specific to the GARP applications, such as the VLAN or
multicast address attribute.
GARP itself does not exist on a device as an entity. GARP-compliant application entities
are called a GARP application. It primarily applies to GVRP and GMRP. When a GARP
application entity is present on a port on your device, this port is regarded as a GARP
application.
The GARP mechanism allows the configuration of a GARP participant to propagate
throughout a LAN quickly. In GARP, a GARP participant registers or deregisters its attributes
with other participants by making or withdrawing declarations of attributes and at the same
time, based on received declarations or withdrawals handles attributes of other participants.
GARP participants exchange attributes primarily by sending the following three types of
messages：Join、Leave and LeaveAll.
I. Join to announce the willingness to register some attribute with other
participants.
II. Leave to announce the willingness to deregister with other participants.
LeaveAll to deregister all attributes. A LeaveAll message is sent upon expiration of a
LeaveAll timer, which starts upon the startup of a GARP application entity.
Together with Join messages and Leave messages help GARP participants complete
attribute registration and deregistration. All the attributes messages can forward to all
switches in the same network.
GARP application entities send protocol data units (PDU) with a particular multicast MAC
address as destination. Based on this address, a device can identify to which GARP
application, GARP for example, should a GARP PDU be delivered.
GARP is described in IEEE 802.1Q.
2. GVRP
GVRP is a GARP application. It functions based on the operating mechanism of GARP to
maintain and propagate dynamic VLAN registration information for the GVRP devices on the
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