GVRP

General Operation

Switch “A”

 

 

 

 

Switch “C”

 

 

GVRP On

1

5

 

GVRP On

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tagged

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11

VLAN 22

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tagged

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VLAN 33

 

 

12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Switch “B”

 

 

 

Switch “D”

(No GVRP)

 

 

 

GVRP On

Tagged

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VLAN 22

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

Switch “D”:

Port 3 dynamically joins VLANs 22 and 33.

Port 6 dynamically joins VLAN 22 and 33.

Switch “C”:

Port 5 dynamically joins VLAN 22.

Ports 11 and 12 belong to Tagged VLAN 33.

2Switch “E” GVRP On

7

Switch “E”:

Port 2 dynamically joins VLANs 22 and 33. Port 7 dynamically joins VLANs 33 and 22.

Figure 3-2. Example of GVRP Operation

N o t e

A port can learn of a dynamic VLAN through devices that are not aware of

 

GVRP (Switch “B”, above). VLANs must be disabled in GVRP-unaware devices

 

to allow tagged packets to pass through.

 

 

A GVRP-aware port receiving advertisements has these options:

If there is not already a static VLAN with the advertised VID on the receiving port, then dynamically create the VLAN and become a member.

If the switch already has a static VLAN assignment with the same VID as in the advertisement, and the port is configured to Auto for that VLAN, then the port will dynamically join the VLAN and begin moving that VLAN’s traffic. (For more detail on Auto, see “Per-Port Options for Dynamic VLAN Advertising and Joining” on page 3-9.)

Ignore the advertisement for that VID.

Don’t participate in that VLAN.

Note also that a port belonging to a Tagged or Untagged static VLAN has these configurable options:

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