GE ML1200 instruction manual Vlan assignment in Gvrp enabled switches

CHAPTER 11: VLAN REGISTRATION OVER GARP VLAN REGISTRATION OVER GARP

11.Port 2 receives advertisement of VID 3. (Port 2 was already statically configured for VIDs 1, 2, 3).

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.

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. A port can learn of a dynamic VLAN through devices that are not aware of GVRP (Switch “B”).

Switch A GVRP On

Tagged VLAN 22

Switch B No GVRP

15

Switch C GVRP On

Tagged VLAN 22

Tagged VLAN 33

Switch D

GVRP On

Dynamic

VLAN 33

Switch C

Port 5 dynamically joined VLAN 22 Ports 11, 12 belong to Tagged VLAN 33

11 2 Switch E

12GVRP On Dynamic VLAN 33

Dynamic

3VLAN 22

7

Tagged VLAN 22

Dynamic VLAN 22

6

Switch E

Port 2 dynamically joined VLAN 33 Ports 7 dynamically joined VLAN 33

Switch D
Port 3 dynamically joined VLAN 33
Ports 6 dynamically joined VLAN 33	754722A1.CDR

FIGURE 11–2: VLAN assignment in GVRP enabled switches

An “unknown VLAN” is a VLAN that the switch learns of by GVRP. For example, suppose that port 1 on switch “A” is connected to port 5 on switch “C”. Because switch “A” has VLAN 22 statically configured, while switch “C” does not have this VLAN statically configured, VLAN 22 is handled as an “Unknown VLAN” on port 5 in switch “C”. Conversely, if VLAN 22 was statically configured on switch C, but port 5 was not a member, port 5 would become a member when advertisements for VLAN 22 were received from switch “A”. GVRP provides a per-port join-request option which can be configured.

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 no static VLAN with the advertised VID on the receiving port, then dynamically create a VLAN with the same VID as in the advertisement, and allow that VLAN's traffic

•If the switch already has a static VLAN with the same VID as in the advertisement, and the port is configured to learn for that VLAN, then the port will dynamically join the VLAN and allow that VLAN's traffic.

•Ignore the advertisement for that VID and drop all GVRP traffic with that VID

•Don't participate in that VLAN

•A port belonging to a tagged or untagged static VLAN has these configurable options:

MULTILINK ML1200 MANAGED FIELD SWITCH – INSTRUCTION MANUAL 11–3