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62 CHAPTER 3: VLAN CONFIGURATION
join message. When the GARP participant wants to remove its attribute
information from other switches, it sends a leave message. The leaveall timer is
started at the same time that each GARP participant is enabled and a leaveall
message is sent out when the leaveall timer times out. The join and leave
messages cooperate to ensure the logout and the re-registration of a message. By
exchanging messages, all the attribute information to be registered can be
propagated to all the switches in the same switching network.
The destination MAC addresses of the packets of the GARP participants are
specific multicast MAC addresses. A switch that supports GARP classifies the
packets that it receives from GARP participants and processes them with the
corresponding GARP applications (GVRP or GMRP).
GARP and GMRP are described in details in the IEEE 802.1p standard. The Switch
7750 fully supports GARP compliant with the IEEE standards.
■ The value of the GARP timer is used in all GARP applications, including GVRP
and GMRP, that are running in a switching network.
■ In one switching network, GARP timers on all the switching devices should be
set to the same value.
Setting the GARP Timers
GARP timers include the hold, join, and leaveall timers.
The GARP participant sends join message regularly when the join timer times out
so that other GARP participants can register its attribute values.
When the GARP participant wants to remove attribute values, it sends a leave
message. When the leave message arrives, the receiving GARP participant starts
the leave timer. If the receiving participant does not receive a join message from
the sender before the leave timer expires, the receiving participant removes the
sender’s GARP attribute values.
The leaveall timer is started as soon as a GARP participant is enabled. A leaveall
message is sent at timeout so that other GARP participants remove all the
attribute values of this participant. Then, the leaveall timer is restarted and a new
cycle begins.
When a switch receives GARP registration information, it does not send a join
message immediately. Instead, it enables a hold timer and sends the join message
outward when the hold timer times out. In this way, all the VLAN registration
information received within the time specified by the hold timer can be sent in one
frame to save bandwidth.
Table 56 Setting the GARP Timers
Operation Command
Configure the hold, join, and leave timers in Ethernet port view.
Set the GARP hold, join, and
leave timers
garp timer { hold | join | leave } timer_value
Restore the default GARP
hold, join, and leave timer
settings
undo garp timer { hold | join | leave }