Allied Telesis AT-S63 - Manual (Page 636)

Chapter 26: GARP VLAN Registration Protocol
636 Section VI: VLANs
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:
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 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.
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. The
procedure for this is found in “Converting a Dynamic GVRP VLAN” on
page 646.
ˆ The default port settings on the switch for GVRP is active, meaning
that the ports participate in GVRP. Allied Telesyn recommends
disabling GVRP on those ports that are connected to GVRP-inactive
devices, meaning devices that do not feature GVRP.