Configuring Gvrp - HP A5830 Configuration Manual

Configuring GVRP

GARP provides a generic framework for devices in a switched LAN, such as end stations and switches, to
register and deregister attribute values. The 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.
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 43, a GARP participant registers and deregisters its attribute values with other 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 43 How GARP works
Device A
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 message types
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
1.
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.
Leave messages
2.
Register
Declaration
De-register
Declaration withdrawal
Device B
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