Allied Telesis AT-S62 - Manual (Page 584)

Chapter 25: GARP VLAN Registration Protocol
584 Section V: VLANs
3. Switch #2 sends a PDU out port 15 containing all of the VIDs of the
VLANs on the switch, including the new GVRP_VLAN_11 VLAN with
its VID of 11. (It should be noted that port 15 is not yet a member of the
VLAN. Ports are added to VLANs when they receive, not send a PDU.)
4. Switch #3 receives the PDU on port 17 and, after examining it, notes
that one of the VLANs on Switch #2 has the VID 11, which matches
the VID of an already existing VLAN on the switch. So it does not
create the VLAN since it already exists. It then determines whether the
port that received the PDU, in this case port 17, is a member of the
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 17 to Switch #2.
6. Switch #2 receives the PDU on port 15 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 a new dynamic GVRP VLAN,
GVRP_VLAN_11, with a VID of 11 on Switch #2 and added ports 4 and 15
to the VLAN as tagged dynamic GVRP ports.
Guidelines
Here 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 user-configure
VLAN mode, which is the VLAN mode for creating your own tagged
and port-based VLANs. GVRP is not supported 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