GVRP

General Operation

Operating Note: When a GVRP-aware port on a switch learns a VID through GVRP from another device, the switch begins advertising that VID out all of its ports except the port on which the VID was learned.

Core switch with static VLANs (VID= 1, 2, & 3). Port 2 is a member of VIDs 1, 2, & 3.

1.Port 2 advertises VIDs 1, 2, & 3.

2.Port 1 receives advertise- ment of VIDs 1, 2, & 3 AND becomes a member of VIDs 1, 2, & 3.

3.Port 3 advertises VIDs 1, 2, & 3, but port 3 is NOT a member of VIDs 1, 2, & 3 at this point.

4.Port 4 receives advertise- ment of VIDs 1, 2, & 3 AND becomes a member of VIDs 1, 2, & 3.

5.Port 5 advertises VIDs 1, 2, & 3, but port 5 is NOT a member of VIDs 1, 2, & 3 at this point.

Port 6 is statically configured to be a member of VID 3.

Switch 1

 

Switch 2

 

 

Switch 3

 

 

Static VLAN con-

 

 

 

 

GVRP On

 

GVRP On

 

 

GVRP On

 

 

figured End Device

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(NIC or switch)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

with GVRP On

 

 

 

 

 

2

 

 

1

 

3

 

4

 

5

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11. Port 2 receives

9. Port 3 receives advertise-

7. Port 5 receives advertise-

6. Port 6 advertises VID 3.

advertisement of VID 3. (Port

ment of VID 3 AND becomes

ment of VID 3 AND becomes

 

 

 

 

 

 

2 is already statically

a member of VID 3. (Still not

a member of VID 3. (Still not

 

 

 

 

 

 

configured for VID 3.)

a member of VIDs 1 & 2.)

a member of VIDs 1 & 2.)

 

 

 

 

 

 

 

 

 

 

10. Port 1 advertises VID 3.

8. Port 4 advertises VID 3.

 

 

 

 

 

 

Figure 3-1. Example of Forwarding Advertisements and Dynamic Joining

Note that if a static VLAN is configured on at least one port of a switch, and that port has established a link with another device, then all other ports of that switch will send advertisements for that VLAN.

For example, in the following figure, Tagged VLAN ports on switch “A” and switch “C” advertise VLANs 22 and 33 to ports on other GVRP-enabled switches that can dynamically join the VLANs.

3-5