IEEE 802.1Q VLAN
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13-5
forward the message to all other ports. When the message arrives at
another switch that supports GVRP, it will also place the receiving port in
the specified VLANs, and pass the message on to all other ports. VLAN
requirements are propagated in this way throughout the network. This
allows GVRP-compliant devices to be automatically configured for VLAN
groups based solely on endstation requests.
To implement GVRP in a network, first add the host devices to the
required VLANs (using the operating system or other application
software), so that these VLANs can be propagated onto the network. For
both the edge switches attached directly to thes e hosts, and core switches
in the network, enable GVRP on the links between these devices. You
should also determine security boundaries in the network and disable
GVRP on the boundary ports to prevent advertisements from bein g
propagated, or forbid those ports from joining restricted VLANs.
Note: If you have host devices that do not support GVRP, you should
configure static or untagged VLANs for the switch ports
connected to these devices (as described in “Adding Static
Members to VLANs (VLAN Index)” on page 13-12). But you can
still enable GVRP on these edge switches, as well as on the core
switches in the network.
Forwarding Tagged/Untagged Frames
If you want to create a small port-based VLAN for devi ces attached
directly to a single switch, you can assign ports to the sam e untagged
VLAN. However, to participate in a VLAN group that crosses several