Understanding GTPv2 Message Filtering
When a device receives a GPRS tunneling protocol version 2 (GTPv2) packet, it checks the packet against GTPv2 policies configured on the device. If the packet matches a policy, then the device inspects the packet based on the GTPv2 inspection object applied to the policy. If the packet fails to match any of the configuration parameters, it is dropped. If the packet matches all the configuration parameters, it is forwarded.