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Multiple VLAN Registration Protocol (MVRP) (GVRP)

By Vikas Bagwe

Multiple VLAN Registration Protocol (MVRP) formerly known as GARP VLAN Registration Protocol (GVRP) or Generic VLAN Registration Protocol is a standards-based Layer 2 network protocol, for automatic configuration of VLAN information on switches. It was defined in the 802.1ak amendment to 802.1Q-2005.

Network Diagram

Figure 1-1 Network diagram for GVRP configuration

Networking and Configuration Requirements

On the network as shown in Figure 1-1:
l          Configure all the involved Ethernet ports on the switches as trunk ports that carry the traffic of all VLANs.
l          Enable GVRP both globally and on all the ports on each switch.
l          Configure static VLAN 5 for Switch C, static VLAN 8 for Switch D, and static VLAN 5 and static VLAN 7 for Switch E. Switch A and Switch B are not configured with static VLANs.
l          Set the registration mode of GigabitEthernet 1/0/1 on Switch E to fixed, and display dynamic VLAN registration information of Switch A, Switch B, and Switch E.
l          Set the registration mode of GigabitEthernet 1/0/1 on Switch E to forbidden, and display dynamic VLAN registration information of Switch A, Switch B, and Switch E.

Configuration Example

l          Configuration on SwitchA
#
 gvrp
#
interface GigabitEthernet1/0/1
 port link-type trunk
 port trunk permit vlan all
 gvrp
#
interface GigabitEthernet1/0/2
 port link-type trunk
 port trunk permit vlan all
 gvrp
#
interface GigabitEthernet1/0/3
 port link-type trunk
 port trunk permit vlan all
 gvrp                           
l          Configuration on SwitchB
#
 gvrp
#
interface GigabitEthernet1/0/1
 port link-type trunk
 port trunk permit vlan all
 gvrp
#
interface GigabitEthernet1/0/2
 port link-type trunk
 port trunk permit vlan all
 gvrp
l          Configuration on SwitchC
#
 gvrp
#
vlan 5
#
interface GigabitEthernet1/0/1
 port link-type trunk
 port trunk permit vlan all
 gvrp
l          Configuration on SwitchD
#
 gvrp
#
vlan 8
#
interface GigabitEthernet1/0/1
 port link-type trunk
 port trunk permit vlan all
 gvrp
l          Configuration on SwitchE
#
 gvrp
#
vlan 5
#
vlan 7
#
interface GigabitEthernet1/0/1
 port link-type trunk
 port trunk permit vlan all
 gvrp registration forbidden
 gvrp

Configuration Guidelines

l          On a GVRP-enabled trunk port, you must configure the port trunk permit vlan all command to ensure that the traffic of all dynamically registered VLANs can pass through. To prevent users of unauthorized VLANs from accessing restrictive resources from a GVRP-disabled port, you are discouraged to use the command on the port.
l          Before enabling GVRP on a port, enable GVRP globally first.
l          GVRP can only be configured on trunk ports. You cannot change the link type of a trunk port with GVRP enabled.
l          GVRP is mutually exclusive with the service loopback feature.
l          In an MSTP network, GVRP can run on only the common and internal spanning tree (CIST). In addition, blocked ports on the CIST cannot receive/send GVRP packets.
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