GVRP

Introduction

Per-Port Options for Dynamic VLAN Advertising and

Joining

Initiating Advertisements. As described in the preceding section, to enable dynamic joins, GVRP must be enabled and a port must be configured to Learn (the default). However, to send advertisements in your network, one or more static (Tagged, Untagged, or Auto) VLANs must be configured on one or more switches (with GVRP enabled), depending on your topology.

Enabling a Port for Dynamic Joins. You can configure a port to dynamically join a static VLAN. The join will then occur if that port subsequently receives an advertisement for the static VLAN. (This is done by using the Auto and Learn options described in table 3-2,below.

Parameters for Controlling VLAN Propagation Behavior. You can configure an individual port to actively or passively participate in dynamic VLAN propagation or to ignore dynamic VLAN (GVRP) operation. These options are controlled by the GVRP “Unknown VLAN” and the static VLAN configuration parameters, as described in the following table:

Table 3-2. Controlling VLAN Behavior on Ports with Static VLANs

Per-Port

 

Static VLAN Options—Per VLAN Specified on Each Port 1

“Unknown

 

 

 

 

 

 

 

 

Port Activity: Forbid (Per VLAN)2

VLAN”

Port Activity:

Port Activity:

(GVRP)

 

2

Auto2 (Per VLAN)

 

 

Configuration

Tagged or Untagged (Per VLAN)

 

 

 

 

 

 

 

Learn

The port:

The port:

The port:

(the Default)

• Belongs to specified VLAN.

• Will become a member of

1.

Will not become a member of

 

Advertises specified VLAN.

specified VLAN if it receives

 

the specified VLAN.

 

• Can become a member of

advertisements for specified

1.

Will not advertise specified

 

 

dynamic VLANs for which it

VLAN from another device.

 

VLAN.

 

 

receives advertisements.

• Will advertise specified VLAN.

1.

Can become a member of

 

Advertises dynamic VLANs

• Can become a member of

 

other dynamic VLANs for

 

 

that have at least one other

other, dynamic VLANs for

 

which it receives

 

 

port (on the same switch) as a

which it receives

 

advertisements.

 

 

member.

advertisements.

1.

Will advertise a dynamic VLAN

 

 

 

• Will advertise a dynamic VLAN

 

that has at least one other port

 

 

 

that has at least one other port

 

on the same switch as a

 

 

 

(on the same switch) as a

 

member.

 

 

 

member.

 

 

 

 

 

 

 

 

3-8