802.1Q VLAN Configuration
Enabling/Disabling GVRP (GARP VLAN Registration Protocol)
Matrix E1 Series (1G694-13) Configuration Guide 6-25
6.2.6 Enabling/Disabling GVRP (GARP VLAN Registration Protocol)
Purpose
To dynamically create VLANs across a switched network. The GVRP command set is used to
display GVRP configuration information, the current global GVRP state setting, individual port
GVRP settings (enable or disable) and GVRP timer settings. By default, GVRP is enabled on all
ports.
More About GARP VLAN Registration Protocol (GVRP)
The following sections describe the switch operation when its ports are operating under the Generic
Attribute Registration Protocol (GARP) application – GARP VLAN Registration Protocol
(GVRP).
Overview
The purpose of GVRP is to dynamically create VLANs across a switched network. When a VLAN
is declared, the information is transmitted out GVRP configured ports on the switch in a GARP
formatted frame using the GVRP multicast MAC address. A switch that receives this frame,
examines the frame, and extracts the VLAN IDs. GVRP then creates the VLANs and adds the
receiving port to its tagged member list for the extracted VLAN ID (s). The information is then
transmitted out the other GVRP configured ports of the switch. Figure 6-1 shows an example of how
VLAN blue from end station A would be propagated across a switch network.
How It Works
In Figure 6-1, Switch 4, port 1 is registered as being a member of VLAN Blue and then declares
this fact out all its ports (2 and 3) to Switch 1 and Switch 2. These two switches register this in the
Port Egress Lists of the ports (Switch 1, port 1 and Switch 2, port 1) that received the frames with
the information. Switch 2, which is connected to Switch 3 and Switch 5 declares the same
information to those two switches and the Port Egress List of each port is updated with the new
information, accordingly.
NOTE: By factory default, GVRP is globally disabled on the device and enabled on all
ports. Although enabled, GRVP will not take effect on individual ports until it is globally
enabled on the device.
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