11–2 MULTILINK ML2400 ETHERNET COMMUNICATIONS SWITCH – INSTRUCTION MANUAL
VLAN REGISTRATION OVER GARP CHAPTER 11: VLAN REGISTRATION OVER GARP
Note
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 family of switches. 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.
FIGURE 11–1: GVRP operation
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
3 at this point.
6. Port 6 on the end device is statically configured to be a member of VID 3. Port
6 advertises 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
1 or 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).
754721A1.CDR
2
Switch 1
GVRP On
2 3
Switch 2
GVRP On
1
3
Switch 2
GVRP On
3
1
5
Switch 3
GVRP On
4
5
Switch 3
GVRP On
5
4
Static VLAN
configured end
device (NIC or
switch) with
GVRP on
66
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