Configuring GARP VLAN Registration Protocol (GVRP)
8 - 3
In this configuration, the edge devices are statically (manually) configured with VLAN information. The core
device dynamically configures itself to be a member of each of the edge device’s VLANs. The operation of GVRP
on the core device results in the following VLAN configuration on the device:
• VLAN 20
• 1/24 (tagged)
• 6/24 (tagged)
• VLAN 30
• 6/24 (tagged)
• 8/17 (tagged)
• VLAN 40
• 1/24 (tagged)
• 8/17 (tagged)
VLAN 20 traffic can now travel through the core between edge devices A and B. Likewise, VLAN 30 traffic can
travel between B and C and VLAN 40 traffic can travel between A and C. If an edge device is moved to a different
core port or the VLAN configuration of an edge device is changed, the core device automatically reconfigures itself
to accommodate the change.
Notice that each of the ports in the dynamically created VLANs is tagged. All GVRP VLAN ports configured by
GVRP are tagged, to ensure that the port can be configured for additional VLANs.
NOTE: This example assumes that the core device has no static VLANs configured. However, you can have
static VLANs on a device that is running GVRP. GVRP can dynamically add other ports to the statically configured
VLANs but cannot delete statically configured ports from the VLANs.
Dynamic Core and Dynamic Edge
GVRP is enabled on the core device and on the edge devices. This type of configuration is useful if the devices in
the edge clouds are running GVRP and advertise their VLANs to the edge devices. The edge devices learn the
VLANs and also advertise them to the core. In this configuration, you do not need to statically configure the
VLANs on the edge or core devices, although you can have statically configured VLANs on the devices. The
devices learn the VLANs from the devices in the edge clouds.
Core Device Edge Device A Edge Device B Edge Device C
GVRP is enabled on all
ports.
Both learning and
advertising are enabled.
Note: Since learning is
disabled on all the edge
devices, advertising on
the core device has no
effect in this
configuration.
GVRP is enabled on port
4/24. Learning is
disabled.
VLAN 20
Port 2/1 (untagged)
Port 4/24 (tagged)
VLAN 40
Port 4/1 (untagged)
Port 4/24 (tagged)
GVRP is enabled on port
4/1. Learning is disabled.
VLAN 20
Port 2/24 (untagged)
Port 4/1 (tagged)
VLAN 30
Port 4/24 (untagged)
Port 4/1 (tagged)
GVRP is enabled on port
4/1. Learning is disabled.
VLAN 30
Port 2/24 (untagged)
Port 4/1 (tagged)
VLAN 40
Port 4/24 (untagged)
Port 4/1 (tagged)
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