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Chapter 23: GARP VLAN Registration Protocol
272 Section VI: Virtual LANs
To control the applicant state machine, an applicant administrative control
parameter is provided. This parameter determines whether or not the
applicant state machine participates in GARP protocol exchanges. The
default value has the applicant participating in the exchanges.
To control the registrar state machine, a registrar administrative control
parameter is provided. This parameter determines whether or not the
registrar state machine listens to incoming GARP messages. The default
value has the registrar listening to incoming GARP messages.
The propagation of information between GARP participants for the same
application in a switch is carried out by the GIP component. The operation
of GIP is dependent upon STP being enabled on a port, because only
ports in the STP Forwarding state are eligible for membership to the GIP
connected ring. Ports in the GIP connected ring propagate GID Join and
Leave requests to notify each other of attribute registrations and
deregistrations. The operation of GIP allows ports in the switch to share
information between themselves and the LANs/end stations to which the
ports are connected.
If a port enters the STP Forwarding state and the GARP application that
the port belongs to is enabled, then the port is added to the GIP connected
ring for the GARP application. All attributes registered by other ports in the
GIP connected ring is propagated to the recently connected port. All
attributes registered by the recently connected port is propagated to all
other ports in the GIP connected ring.
Similarly, if a port leaves the STP Forwarding state and the GARP
application that the port belongs to is enabled, then the port is removed
from the GIP connected ring for the GARP application. Prior to removal,
GID leave requests are propagated to all other ports in the GIP connected
ring if the port to be removed has previously registered an attribute and no
other port in the GIP connected ring has registered that attribute. You can
enable or disable GIP operations.