HP 4108GL Management And Configuration Manual page 340

Port-Based Virtual LANs (VLANs) and GVRP
GVRP
Table 14-2. Options for Handling "Unknown VLAN" Advertisements:
Unknown VLAN
Mode
Learn
(the Default)
Block
Disable
The CLI show gvrp command and the menu interface VLAN Support screen
show a switch's current GVRP configuration, including the Unknown VLAN
settings.
Figure 14-22. Example of GVRP Unknown VLAN Settings
14-34
Operation
Enables the port to dynamically join any VLAN for which it receives an
advertisement, and allows the port to advertise other other VLANs it knows.
Prevents the port from dynamically joining a VLAN that is not statically
configured on that port. The port will still forward advertisements that were
received by the switch on other ports. Block should typically be used on
ports in unsecure networks, where there is exposure to "attacks", such as
ports where intruders can connect.
Causes the port to ignore and drop all GVRP advertisements it receives and
also prevents the port from sending any GVRP advertisements.
GVRP Enabled
(Required for Unknown
VLAN operation.)
Unknown VLAN Settings
Learn
Default: