Configuring Gvrp; Overview; Garp - HP 3100 Series Configuration Manual

Configuring GVRP

The Generic Attribute Registration Protocol (GARP) provides a generic framework for devices in a
switched LAN, such as end stations and switches, to register and deregister attribute values. The
GARP VLAN Registration Protocol (GVRP) is a GARP application that registers and deregisters
VLAN attributes. GVRP uses the operating mechanism of GARP to maintain and propagate dynamic
VLAN registration information for GVRP devices on the network.

Overview

GARP

GARP provides a mechanism that allows participants in a GARP application to distribute, propagate,
and register—with other participants in a LAN—the attributes specific to the GARP application, such
as VLAN or multicast address attributes.
How GARP works
Each port that participates in a GARP application (GVRP, for example) is a GARP participant.
GARP enables GARP participants to propagate attribute values throughout the switched LAN. As
shown in Figure
GARP participants by sending and withdrawing declarations, and registers and deregisters the
attribute values of other participants according to the declarations and withdrawals that it has
received.
Figure 44 How GARP works
For example, a GVRP-enabled port registers and deregisters VLAN in the following cases.
•
When the port receives a VLAN attribute declaration, it registers the VLAN attribute and joins
the VLAN.
•
When the port receives a VLAN withdrawal, it deregisters the VLAN and leaves the VLAN.
GARP messages
A GARP participant exchanges information with other GARP participants by sending GARP
messages: Join, Leave, and LeaveAll. As a GARP application, GVRP also uses GARP messages
for information exchange.
•
Join messages
A GARP participant sends Join messages when it wishes to declare its attribute values or
receives Join messages from other GARP participants.
Join messages fall into JoinEmpty and JoinIn. A GARP participant sends JoinEmpty messages
to declare attribute values that it has not registered. It sends JoinIn messages to declare
attribute values that it has registered.
44, a GARP participant registers and deregisters its attribute values with other
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