Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

There are three GVRP registration modes:

• Normal Registration — Allows dynamic creation, registration, and de-registration of VLANs (if you enabled dynamic VLAN creation). By default, the registration mode is set to Normal when you enable GVRP on a port. This default mode enables the port to dynamically register and de-register VLANs, and to propagate both dynamic and static VLAN information.
• Fixed Registration Mode — figuring a port in fixed registration mode allows for manual creation and registration of VLANs, prevents VLAN deregistration, and registers all VLANs known on other ports on the port. For example, if an interface is statically configured via the CLI to belong to a VLAN, it should not be unconfigured when it receives a Leave PDU. Therefore, the registration mode on that interface is FIXED.
• Forbidden Mode — Disables the port to dynamically register VLANs and to propagate VLAN information except information about VLAN 1. A port with forbidden registration type thus allows only VLAN 1 to pass through even though the PDU carries information for more VLANs. Therefore, if you do not want the interface to advertise or learn about particular VLANS, set the interface to the registration mode of FORBIDDEN.

Based on the configuration in the following example, the interface 1/21 is not removed from VLAN 34 or VLAN 35 despite receiving a GVRP Leave message. Additionally, the interface is not dynamically added to VLAN 45 or VLAN 46, even if a GVRP Join message is received.

Dell(conf-if-gi-1/21)#gvrp registration fixed 34,35
                                 Dell(conf-if-gi-1/21)#gvrp registration forbidden 45,46
                                 Dell(conf-if-gi-1/21)#show conf
                                 !
                                 interface GigabitEthernet 1/21
                                 no ip address
                                 switchport
                                 gvrp enable
                                 gvrp registration fixed 34-35
                                 gvrp registration forbidden 45-46
                                 no shutdown
                                 Dell(conf-if-gi-1/21)#