Signamax Managed Hardened PoE Industrial DIN-rail Mount Switch - Manual (Page 28)

5 VLAN
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The Join message and the Leave message are used together to complete the un-registration
and re-registration of information. Through message exchange, all the attribute information to
be registered can be propagated to all the switches in the same switched network.
GARP uses the following timers:
 Join Timer: To transmit the Join messages reliably to other entities, a GARP entity sends
each Join message two times. The Join timer is used to define the interval at which each
Join message is sent. It ranges from 10 to 2147483640 milliseconds, and it must be
integral multiple of 10. It is 200 milliseconds by default.
 Leave Timer: When a GARP entity expects to unregister a piece of attribute information,
it sends out a Leave message. Any GARP entity receiving this message starts its Leave
timer, and unregisters the attribute information if it does not receives a Join message
again before the timer times out. It ranges from 30 to 2147483640 milliseconds, and it
must be integral multiple of 10. It is 600 milliseconds by default.
 LeaveAll Timer: 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. It ranges from 40 to 2147483640 milliseconds, and it
must be integral multiple of 10. It is 1000 milliseconds by default.
Caution: It must satisfy 2*(join_time) < leave_time < leaveall_time.
5.4.2 GVRP
GVRP (GARP VLAN Registration Protocol) is an implementation of GARP (generic attribute
registration protocol). GVRP allows the switch to automatically add or remove the VLANs via
the dynamic VLAN registration information and propagate the local VLAN registration
information to other switches, without having to individually configure each VLAN.
GVRP has the following three port registration modes: Normal, Fixed, and Forbidden.
 Normal: In this mode, a port can dynamically register/deregister a VLAN and propagate
the dynamic/static VLAN information.
 Fixed: In this mode, a port cannot register/deregister a VLAN dynamically. It only
propagates static VLAN information. That is, a trunk port only permits the packets of
manually configured VLANs in this mode even if you configure the port to permit the
packets of all the VLANs.
 Forbidden: In this mode, a port cannot register/deregister VLANs. It only propagates
VLAN 1 information. That is, a trunk port only permits the packets of the default VLAN