Allied Telesis AT-S63 - Manual (Page 474)

Chapter 21: GARP VLAN Registration Protocol
474 Section III: VLANs
VLAN. If it is not a member, it automatically adds the port to the VLAN
as an tagged dynamic GVRP port. If the port is already a member of
the VLAN, then no change is made.
5. Switch #3 sends a PDU out port 4 to switch #2.
6. Switch #2 receives the PDU on port 3 and then adds the port as a
tagged dynamic GVRP port to the dynamic GVRP_VLAN_11 VLAN.
There is now a communications path for the end nodes of the Sales
VLAN on switches #1 and #3. GVRP created the new GVRP_VLAN_11
dynamic GVRP VLAN with a VID of 11 on switch #2 and added ports 2
and 3 to the VLAN as tagged dynamic GVRP ports.
Guidelines Following are guidelines to observe when using this feature:
❑ GVRP is supported with STP and RSTP, or without spanning tree.
However, GVRP is not supported with MSTP.
❑ 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.
❑ GVRP is not supported when the switch is operating in either of
the multiple VLAN modes.
❑ Both ports that constitute a data link between the switch and the
other device must be running GVRP.
❑ You cannot modify or delete a dynamic GVRP VLAN.
❑ You cannot remove a dynamic GVRP port from a static or dynamic
VLAN.
❑ GVRP is only aware of those VLANs that have active nodes, or
where at least one end node of a VLAN has established a valid link
with a switch. GVRP is not aware of a VLAN if there are no active
end nodes or if no end nodes have established a link with the
switch.
❑ 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.
❑ 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.