Huawei AR3200 Series - Page 154

message the first time, it sends the Join message again. The Join timer specifies the interval
between the two Join messages.
l Leave timer: When a GARP participant expects other participants to deregister its attribute,
it sends Leave messages to other participants. When another participant receives the Leave
message, it starts the Leave timer. If the participant does not receive any Join message
before the Leave timer expires, it deregisters the attributes of the Leave message sender.
l LeaveAll timer: 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 re-register all its attributes. Then the LeaveAll timer restarts.
NOTE
l The GARP timers apply to all GARP participants (such as GVRP) on the same LAN.
l The Hold timer, Join timer, and Leave timer must be set individually on each interface, whereas the
LeaveAll timer is set globally and takes effect on all interfaces of a device.
l Devices on a network may have different settings for the LeaveAll timer. In this case, all the devices
use the smallest LeaveAll timer value on the network. When the LeaveAll timer of a device expires,
the device sends LeaveAll messages to other devices. After other devices receive the LeaveAll
messages, they reset their LeaveAll timers. Therefore, only the LeaveAll timer with the smallest value
takes effect even if devices have different settings for the LeaveAll timer.
l GARP operation process
Through GARP, the configuration information of a GARP member can be propagated on
the entire LAN. A GARP member may be a terminal workstation or a bridge. A GARP
member sends an attribute declaration or an attribute reclaim declaration to request other
GARP members to register or deregister its attributes. The GARP member can also register
or deregister attributes of other members when receiving attribute declarations or attribute
reclaim declarations from other members. When an interface receives an attribute
declaration, it registers the attribute. When the interface receives an attribute reclaim
declaration, the interface deregisters the attribute.
PDUs sent from a GARP participant use a multicast MAC address as the destination MAC
address. When a device receives a packet from a GARP participant, the device identifies
the packet according to the destination MAC address of the packet and sends the packet to
the corresponding GARP participant (such as GVRP).
l Format of a GARP packet
Figure 5-1 shows the format of a GARP packet.
Huawei AR3200 Series Enterprise Routers
Configuration Guide - LAN 5 GVRP Configuration
Issue 02 (2012-03-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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