– Join timer: To ensure reliable transmission of Join messages, a participant can send
each Join message twice. If the participant does not receive the response after
sending the Join message the first time, it sends the Join message again. The Join
timer specifies the interval between the two Join messages.
– 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.
– 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 of 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
LeavelAll timer with the smallest value takes effect even if devices have different settings
of 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 6-1 shows the format of a GARP packet.
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.
331
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