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Configuring Advanced Features
GVRP
Configuring Advanced
Features
As the above table indicates, when you enable GVRP, a port that has a Tagged
or Untagged static VLAN has the option for both generating advertisements
and dynamically joining other VLANs.
Note In table 9-9, above, the Unknown VLAN parameters are configured on a per-
interface basis using the CLI. The Tagged, Untagged, Auto, and Forbid options
are configured in the VLAN context using either the menu interface or the CLI.
Because dynamic VLANs operate as Tagged VLANs, and because a tagged port
on one device cannot communicate with an untagged port on another device,
SMC recommends that you use Tagged VLANs for the static VLANs you will
use to generate advertisements.
GVRP and VLAN Access Control
When you enable GVRP on a switch, the default GVRP parameter settings
allow all of the switch’s ports to transmit and receive dynamic VLAN adver-
tisements (GVRP advertisements) and to dynamically join VLANs. The two
preceding sections describe the per-port features you can use to control and
limit VLAN propagation. To summarize, you can:
■ Allow a port to advertise and/or join dynamic VLANs (the default).
■ Allow a port to send VLAN advertisements, but not receive them from
other devices; that is, the port cannot dynamically join a VLAN but other
devices can dynamically join the VLANs it advertises.
■ Prevent a port from sending dynamic VLAN advertisements for specific
VLANs
■ Prevent a port from participating in GVRP operation.
Port-Leave From a Dynamic VLAN
A dynamic VLAN continues to exist on a port for as long as the port continues
to receive advertisements of that VLAN from another device connected to that
port or until you:
■ Convert the VLAN to a static VLAN (See “Converting a Dynamic VLAN to
a Static VLAN” on page 9-65.)
■ Reconfigure the port to Block or Disable
■ Disable GVRP
■ Reboot the switch
■ The time-to-live for dynamic VLANs is 10 seconds. That is, if a port has
not received an advertisement for an existing dynamic VLAN during the
last 10 seconds, the port removes itself from that dynamic VLAN.