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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 17 Configuring GVRP
Configuring GVRP on the Switch
Configuring GVRP Forbidden Registration
Configuring an 802.1Q trunk port in forbidden registration mode deregisters all the VLANs (except
VLAN 1) and prevents any further VLAN creation or registration on the trunk port.
To configure GVRP forbidden registration on an 802.1Q trunk port, perform this task in privileged mode:
This example shows how to configure forbidden registration on an 802.1Q trunk port:
Console> (enable) set gvrp registration forbidden 1/1
Registrar Administrative Control set to forbidden on port 1/1.
Console> (enable)
Configuring GVRP VLAN Declarations from Blocking Ports
To prevent the undesirable Spanning Tree Protocol (STP) topology reconfiguration on a port that is
connected to a device that does not support Per-VLAN STP+ (PVST+), configure the GVRP active
applicant state on the port. The ports in the GVRP active applicant state send GVRP VLAN declarations
when they are in the STP blocking state, which prevents the STP bridge protocol data units (BPDUs)
from being pruned from the other port.
Note Configuring fixed registration on the other device’s port also prevents undesirable STP topology
reconfiguration.
To configure an 802.1Q trunk port to send VLAN declarations when it is in the blocking state, perform
this task in privileged mode:
This example shows how to configure a group of 802.1Q trunk ports to send VLAN declarations when
it is in the blocking state:
Console> (enable) set gvrp applicant state active 4/2-3,4/9-10,4/12-24
Applicant was set to active on port(s) 4/2-3,4/9-10,4/12-24.
Console> (enable)
Use the normal keyword to return to the default state (active mode disabled).
Task Command
Step 1
Configure forbidden registration on an 802.1Q
trunk port.
set gvrp registration forbidden mod/port
Step 2
Verify the configuration. show gvrp configuration
Task Command
Configure an 802.1Q trunk port to send VLAN
declarations when it is in the blocking state.
set gvrp applicant state {normal | active}
mod/port
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