MNS-BB
Software User Guide
-96-
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 the table, 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,
Blackbox recommends that you use Tagged VLANs for the static VLANs you will use to generate
advertisements.
17.5
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 advertisements (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.
17.6
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”.)
-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.
Converting a Dynamic VLAN to a Static VLAN
.
If GVRP is running on the switch and a port dynamically joins a VLAN, you can use the next
command to convert the dynamic VLAN to a static VLAN. This is necessary if you want to make the
VLAN permanent.
Note:
After you convert a dynamic VLAN to static, you must configure the switch’s per-port
participation in the VLAN in the same way that you would for any static VLAN.
Syntax: static vlan=<dynamic vlanid>
If you need a VID reference, use
show vlan type=tag
to list the switch’s currently existing VLANs.
