H3C S5100-SI Series Operation Manual page 141

Operation Manual – GVRP
H3C S5100-SI/EI Series Ethernet Switches
Once a GARP entity is launched, the LeaveAll timer is triggered at the same time.
The GARP entity sends out LeaveAll messages after the timer times out. LeaveAll
messages deregister all the attributes, through which the attribute information of
the entity can be registered again on the other GARP entities.
Leave messages, LeaveAll messages, together with Join messages ensure attribute
information can be deregistered and re-registered.
Through message exchange, all the attribute information to be registered can be
propagated to all the GARP-enabled switches in the same LAN.
2) GARP timers
Timers determine the intervals of sending different types of GARP messages. GARP
defines four timers to control the period of sending GARP messages.
Hold: When a GARP entity receives a piece of registration information, it does not
send out a Join message immediately. Instead, to save the bandwidth resources,
it starts the Hold timer and puts all received registration information before the
timer times out into one Join message and sends out the message after the timer
times out.
Join: To make sure the devices can receive Join messages, each Join message is
sent twice. If the first Join message sent is not responded for a specific period, a
second one is sent. The period is determined by this timer.
Leave: When a GARP entity expects to deregister a piece of attribute information,
it sends out a Leave message. Any GARP entity receiving this message starts its
Leave timer, and deregisters the attribute information if it does not receives a Join
message again before the timer times out.
LeaveAll: Once a GARP entity starts up, it starts the LeaveAll timer, and sends out
a LeaveALL message after the timer times out, so that other GARP entities can
re-register all the attribute information on this entity. After that, the entity restarts
the LeaveAll timer to begin a new cycle.
Note:
The settings of GARP timers apply to all GARP applications, such as GVRP, on a
LAN.
Unlike other three timers, which are set on a port basis, the LeaveAll timer is set in
system view and takes effect globally.
A GARP application entity may send LeaveAll messages at the interval set by its
LeaveAll timer or the LeaveAll timer on another device on the network, whichever is
smaller. This is because each time a device on the network receives a LeaveAll
message it resets its LeaveAll timer.
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Chapter 1 GVRP Configuration