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GVRP
General Operation
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.
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.
11. Port 2 receives
advertisement of VID 3. (Port
2 is already statically
configured for VID 3.)
9. Port 3 receives advertise-
ment of VID 3 AND becomes
a member of VID 3. (Still not
a member of VIDs 1 & 2.)
10. Port 1 advertises VID 3.
7. Port 5 receives advertise-
ment of VID 3 AND becomes
a member of VID 3. (Still not
a member of VIDs 1 & 2.)
8. Port 4 advertises VID 3.
6. Port 6 advertises VID 3.
1
4
6
5
Switch 1
GVRP On
2
Switch 2
GVRP On
3
Switch 3
GVRP On
Static VLAN con-
figured End Device
(NIC or switch)
with GVRP On