Allied Telesis AT-S63 - Manual (Page 266)

Chapter 23: GARP VLAN Registration Protocol
266 Section VI: Virtual LANs
Guidelines
Following are guidelines to observe when using this feature:
ˆ GVRP is supported with STP and RSTP, or without spanning tree.
GVRP is not supported with MSTP.
ˆ GVRP is supported when the switch is operating in the tagged VLAN
mode, which is the VLAN mode for creating your own tagged and port-
based VLANs.
ˆ GVRP is not supported when the switch is operating in either of the
multiple VLAN modes.
ˆ Both ports that constitute a network link between the switch and the
other device must be running GVRP.
ˆ You cannot modify or delete a dynamic GVRP VLAN.
ˆ You cannot remove a dynamic GVRP port from a static or dynamic
VLAN.
ˆ GVRP can only detect a VLAN where there are active nodes, or where
at least one end node of a VLAN has established a valid link with a
switch. GVRP will not be aware of a VLAN where there are no active
end nodes or if no end nodes have established a link with the switch.
ˆ Resetting a switch erases all dynamic GVRP VLANs and dynamic
GVRP port assignments. The switch relearns the dynamic
assignments as it receives PDUs from the other switches.
ˆ GVRP has three timers that you can set: join timer, leave timer, and
leave all timer. The values for these timers must be set the same on all
switches running GVRP. Timers with different values on different
switches can result in GVRP compatibility problems.
ˆ You can convert dynamic GVRP VLANs and dynamic GVRP port
assignments to static VLANs and static port assignments.
ˆ The default port settings on the switch for GVRP is active, meaning
that the ports participate in GVRP. Allied Telesis recommends
disabling GVRP on those ports that are connected to GVRP-inactive
devices, meaning devices that do not feature GVRP.
ˆ PDUs are transmitted to only those switch ports where GVRP is
enabled.