Allied Telesis AT-S63 - Manual (Page 479)

AT-S63 Management Software Menus Interface User’s Guide
Section III: VLANs 479
The job of the registrar is to record whether an attribute is registered, in
the process of being deregistered, or is not registered for an instance of
GID.
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.