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VLANs configured on the switch. Packets are forwarded only between ports that are designated for the
same VLAN. Untagged VLANs can be used to manually isolate user groups or subnets. Use IEEE 802.3
tagged VLANs with GVRP to fully automate VLAN registration.
Automatic VLAN Registration – GVRP (GARP VLAN Registration Protocol) defines a system where the
switch can automatically learn the VLANs to which each end station should be assigned. If an end station (or
its network adapter) supports the IEEE 802.1Q VLAN protocol, it can be configured to broadcast a message
to your network indicating the VLAN groups it wants to join. When this switch receives these messages, it
will automatically place the receiving port in the specified VLANs, and then 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 end station requests.
To implement GVRP in a network, add the host devices to the required VLANs (using the operating system
or other application software), so the VLANs can be propagated onto the network. For both edge switches
attached directly to these hosts and core switches in the network, enable GVRP on the links between these
devices. Also, determine security boundaries in the network and disable GVRP on the boundary ports to
prevent advertisements from being propagated, or forbid those ports from joining restricted VLANs.
Note:
Host devices that do not support GVRP should be configured as static or untagged VLANs for the
switch ports connected to these devices (see section
10.1.6 Adding Static Members to VLANs (VLAN
Index)
. You can still enable GVRP on these edge switches, as well as on the core switches in the network.
10.1.1 Forwarding Tagged/Untagged Frames
If you want to create a small port-based VLAN for devices attached directly to a single switch, you can
assign ports to the same untagged VLAN. To participate in a VLAN group that crosses several switches, you
should create a VLAN for that group and enable tagging on all ports.
Ports can be assigned to multiple tagged or untagged VLANs. Each port on the switch is capable of passing
tagged or untagged frames. When forwarding a frame from this switch along a path that contains any VLAN-
aware devices, the switch should include VLAN tags. When forwarding a frame from this switch along a path
that does not contain any VLAN-aware devices (including the destination host), the switch must first strip off
the VLAN tag before forwarding the frame. When the switch receives a tagged frame, it passes this frame
onto the VLAN(s) indicated by the frame tag. When this switch receives an untagged frame from a VLAN-
unaware device, it first decides where to forward the frame, and then inserts a VLAN tag reflecting the
ingress port’s default VID.
10.1.2 Enabling or Disabling GVRP (Global Setting)
GARP VLAN Registration Protocol (GVRP) defines a way for switches to exchange VLAN information and to
register VLAN members on ports across the network. VLANs are dynamically configured based on join
messages issued by host devices and propagated throughout the network. GVRP must be enabled to permit
automatic VLAN registration and to support VLANs that extend beyond the local switch. (Default: Disabled)
Configuring Switch Using the Web or CLI
Web
Click VLAN – 802.1Q VLAN, GVRP Status
. Enable or disable GVRP, and click Apply.
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