GE ML1200 instruction manual Gvrp Operations, Vlan Registration Over Garp

VLAN REGISTRATION OVER GARP CHAPTER 11: VLAN REGISTRATION OVER GARP

There must be one common VLAN (that is, one common VID) connecting all of the GVRP- aware devices in the network to carry GVRP packets. GE Multilin recommends the default VLAN (DEFAULT_VLAN; VID = 1), which is automatically enabled and configured as untagged on every port of the MultiLink ML1200 Managed Field Switch. That is, on ports used as GVRP links, leave the default VLAN set to untagged and configure other static VLANs on the ports as either “Tagged or Forbid” (“Forbid” is discussed later in this chapter).

11.1.3 GVRP Operations

A GVRP-enabled port with a tagged or untagged static VLAN sends advertisements (BPDUs, or Bridge Protocol Data Units) advertising the VLAN identification (VID) Another GVRP-aware port receiving the advertisements over a link can dynamically join the advertised VLAN. All dynamic VLANs operate as Tagged VLANs. Also, a GVRP-enabled port can forward an advertisement for a VLAN it learned about from other ports on the same switch. However, the forwarding port will not itself join that VLAN until an advertisement for that VLAN is received on that specific port.

Switch 1

GVRP On

2

Switch 2		Switch 3
GVRP On		GVRP On
1	3	4	5

FIGURE 11–1: GVRP operation

Static VLAN configured end device (NIC or switch) with

GVRP on

6

754721A1.CDR

Switch 1 with static VLANs (VID= 1, 2, and 3). Port 2 is a member of VIDs 1, 2, and 3.

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

2.On Switch 2 - Port 1 receives advertisement of VIDs 1, 2, and 3 AND becomes a member of VIDs 1, 2, and 3.

3.As discussed above, a GVRP enabled port can forward advertisement for a VLAN it learnt about. So port 3 advertises VIDs 1, 2, and 3, but port 3 is NOT a member of VIDs 1, 2, and 3 at this point, nor will it join the VLAN until and advertisement is received.

4.On Switch 3, port 4 receives advertisement of VIDs 1, 2, and 3 and becomes a member of VIDs 1, 2, and 3.

5.Port 5 advertises VIDs 1, 2,and 3, but port 5 is NOT a member of VIDs 1, 2, and

3at this point.

6.Port 6 on the end device is statically configured to be a member of VID 3. Port

6advertises VID 3.

7.Port 5 receives advertisement.

8.Port 4 advertises VID 3.

9.Port 3 receives advertisement of VID 3 AND becomes a member of VID 3. (Still not a member of VIDs 1 and 2 as it did not receive any advertisements for VID

1or 2).

10.Port 1 advertises VID 3 of VID 3 AND becomes a member of VID 3. (Port 1 is still not a member of VIDs 1 and 2).

11–2 MULTILINK ML1200 MANAGED FIELD SWITCH – INSTRUCTION MANUAL