Allied Telesis AT-S62 - Manual (Page 423)

AT-S62 User’s Guide
Section V: Virtual LANs 423
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:
❑ GVRP is supported with STP and RSTP, or without spanning tree.
GVRP is not supported with MSTP.
❑ 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.
❑ 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.