Allied Telesis AT-8550 - Manual (Page 75)

AT-9108, AT-8518, AT-8525, and AT-8550 User’s Guide
4-9
In Figure 4-6 , Switch A is a member of VLAN Red. VLAN Red has the
VLANid 10. Port 1 and port 2 on Switch A are added to the VLAN as
untagged.
The configuration for Switch A is as follows:
create vlan red
config vlan red tag 10
config vlan red add port 1-2 untagged
enable gvrp
Switch B does not need to be configured with VLAN or tagging
information. Instead, using GVRP, the server connected to Switch B,
and the remainder of the network connected to Switch B provides
Switch B with the information it needs to forward traffic. Switch A
automatically adds port 3 to VLAN Red because Switch A now knows
that there are other devices on port 3 that need access to VLAN Red.
VLANs that are automatically created using GVRP with the VLANid 10
are given names in the format
gvrp vlan xxxx
where xxxx is the VLANid (in decimal) that is discovered by GVRP.
These VLANs are not permanently stored in nonvolatile storage, and
you cannot add or remove ports from these VLANs.
GVRP assumes that the VLANs for which it carries information
operate using VLAN tags, unless explicitly configured otherwise.
Typically, you must configure any untagged VLANs on the switches
at the edges of the network, and the GVRP protocol is used across
the core of the network to automatically configure other switches
using tagged VLANs.
Note
You cannot assign an IP address to a VLAN learned by way of GVRP.
GVRP and Spanning Tree Domains. Because GVRP-learned VLANs
are dynamic, all VLANs created by GVRP use the system defaults and
become members of the default Spanning Tree Domain (STPD), s0.
Because two STPDs cannot exist on the same physical port, if two
GVRP clients attempt to join two different VLANs that belong to two
different STPDs, the second client is refused. You should configure all
potential GVRP VLANs to be members of the same STPD. This
configuration is done automatically, if you have not configured
additional STPDs.