Netis ST3326(ST-3302) [109/118] Chapter14 advanced setup

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Chapter14: Advanced Setup
14.1GVRP
Introduction to GVRP
GARP VLAN registration protocol (GVRP) is an implementation of generic attribute registration
protocol (GARP). GARP is introduced as follows.
GARP
The 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 the attributes specific to the GARP application, such as the VLAN or multicast
attribute.
GARP itself does not exist on a device as an entity. GARP-compliant application entities are called
GARP applications. One example is GVRP. When a GARP application entity is present on a port on
your device, this port is regarded a GARP application entity.
Operating mechanism of GARP
Through the mechanism of GARP, the configuration information on a GARP member will be
propagated within the whole LAN. A GARP member can be a terminal workstation or a bridge; it
instructs other GARP members to register/deregister its attribute information by
declaration/recant, and register/deregister other GARP member's attribute information
according to other member's declaration/recant. When a port receives an attribute declaration,
the port will register this attribute.
When a port receives an attribute recant, the port will deregister this attribute.
The protocol packets of GARP entities use specific multicast MAC addresses as their destination
MAC addresses. When receiving these packets, the switch distinguishes them by their
destination MAC addresses and delivers them to different GARP application (for example, GVRP)
for further processing.
GVRP
As an implementation of GARP, GARP VLAN registration protocol (GVRP) maintains dynamic
VLAN registration information and propagates the information to the other switches through
GARP.
With GVRP enabled on a device, the VLAN registration information received by the device from
other devices is used to dynamically update the local VLAN registration information, including
the information about the VLAN members, the ports through which the VLAN members can be
reached, and so on. The device also propagates the local VLAN registration information to other
devices so that all the devices in the same LAN can have the same VLAN information. VLAN

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