Signamax Managed Hardened PoE Industrial DIN-rail Mount Switch - Manual (Page 27)

5 VLAN
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5.4 GARP
GARP VLAN registration protocol (GVRP) is an implementation of generic attribute
registration protocol (GARP). It maintains dynamic VLAN registration information and
propagates the information to other switches by adopting the same mechanism as that of
GARP.
After the GVRP feature is enabled on a switch, the switch receives the VLAN registration
information from other switches to dynamically update the local VLAN registration information
(including VLAN members, ports through which the VLAN members can be reached, and so
on). The switch also propagates the local VLAN registration information to other switches so
that all the switching devices in the same switched network can have the same VLAN
information. The VLAN registration information includes not only the static registration
information configured locally, but also the dynamic registration information received from
other switches.
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Note:
Before configuring GARP, make sure to enable GVRP in 3 Advanced Configuration .
5.4.1 GARP Setting
The information exchange between GARP members is completed by messages. The
messages performing important functions for GARP fall into three types: Join, Leave and
LeaveAll.
When a GARP entity expects other switches to register certain attribute information of its own,
it sends out a Join message.
When a GARP entity expects other switches to unregister certain attribute information of its
own, it sends out a Leave message.
Once a GARP entity starts up, it starts the LeaveAll timer. After the timer times out, the GARP
entity sends out a LeaveAll message.