6.1 GVRP Overview
This section explains the concepts of Generic Attribute Registration Protocol (GARP) and GARP
VLAN Registration Protocol (GVRP), and how they relate to each another.
GVRP
GVRP is an application of GARP that maintains and propagates VLAN registration information
to other devices.
GARP
GARP enables member switches on a LAN to distribute, transmit, and register information such
as VLAN information and multicast addresses with one another.
GARP is not an entity on a device. GARP-compliant entities are called GARP participants.
GVRP is a GARP application. When a GARP application runs on an interface, the interface is
considered a GARP participant.
l GARP messages and timers
– GARP messages
GARP members transmit VLAN registration information by exchanging GARP
messages. The three main GARP messages are Join, Leave, and LeaveAll.
– When a GARP participant expects other devices to register its attributes, it sends
Join messages to other devices. When the GARP participant receives a Join message
from another participant or is configured with attributes statically, it also sends Join
messages to other devices for the devices to register the new attributes.
– When a GARP participant expects other devices to deregister its attributes, it sends
Leave messages to other devices. When the GARP participant receives a Leave
message from another participant or some of its attributes are deregistered statically,
it also sends Leave messages to other devices.
– When a GARP participant is enabled, the LeaveAll timer is started. When the
LeaveAll timer expires, the GARP participant sends LeaveAll messages to request
other GARP participants to deregister all the attributes of the sender. Then other
participants can re-register the attributes.
The Join, Leave, and LeaveAll messages are used to control registration and
deregistration of attributes.
Through GARP messages, all attributes that need to be registered are sent to all the
GARP-enabled devices on the same LAN.
– GARP timers
The intervals for sending GARP messages are controlled by GARP timers. GARP
defines four timers to control the intervals for sending GARP messages.
– Hold timer: When a GARP participant receives a registration message from another
participant, it does not send the registration message in a Join message to other
participants immediately. Instead, the participant starts the Hold timer. When the
Hold timer expires, the participant packs all the registration messages received
within this period in a Join message and sends the Join message to other participants.
This saves bandwidth on the network.
Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet 6 GVRP Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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