A Bridge VLAN interface is similar to that of a VLAN interface except for that post traffic inspection, the Sensor changes the VLAN tag of the traffic to the one that you specify.
Thus the Sensor bridges the traffic between these two VLANs. This feature can enable effective utilization of the IPS capacity of your Sensors.
Note
This is applicable only for NS9600, NS9500, NS9300, NS9200, NS9100, NS7600, NS7500, NS7350, NS7250, NS7150, NS7300, NS7200, NS7100, and NS3600 Sensors deployed inline fail-closed. However, ports that have built-in fail-open, support VLAN bridging even when the ports are configured for fail-closed. VLAN bridging is not supported on NS5200, NS5100, NS3500, NS3200, and NS3100 Sensors.