MNS-BB Software User Guide
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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”, below
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”,
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 a VLAN with the same VID as in the advertisement, and begin moving that VLAN’s traffic.
If the switch already has a static VLAN assignment 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
begin moving that VLAN’s traffic. (For more detail on Leran, see “Per-Port Options for Dynamic
VLAN Advertising and Joining”.)
Ignore the advertisement for that VID and drop all GVRP traffic with 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:
Send VLAN advertisements, and also receive advertisements for VLANs on other ports and
dynamically join those VLANs.
Send VLAN advertisements, but ignore advertisements received from other ports.
Avoid GVRP participation by not sending advertisements and dropping any advertisements received
from other devices.
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