Configuring Advanced Features

GVRP

Table 9-8. Options for Handling “Unknown VLAN” Advertisements:

UnknownVLAN

Operation

Mode

 

 

 

Learn

Enables the port to dynamically join any VLAN for which it receives an

(the Default)

advertisement, and allows the port to forward advertisements it receives.

Block

Prevents the port from dynamically joining a VLAN that is not statically

 

configured on the switch. 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.

Disable

Causes the port to ignore and drop all advertisements it receives from any

 

source.

 

 

The CLI show gvrp command and the menu interface VLAN Support screen show a switch’s current GVRP configuration, including the Unknown VLAN settings.

Features

Advanced Configuring

 

 

GVRP Enabled

(Required for Unknown VLAN operation.)

Unknown VLAN Settings

Default: Learn

Figure 9-59. Example of GVRP Unknown VLAN Settings

The above options also influence GVRP operation on ports where static VLANs are configured. (See the next section.)

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