Used to indicate when filters applied to this port should be treated as 'permit' or 'deny' filters. When filters are not enabled on the port the mode is set to none. The port does not block any packet. Mode None cannot be used when PortEnable is true. On a port configured as 'permit', any packet that satisfies a filter is allowed to be forwarded. On a port configured as 'deny', any packet that satisfies a filter is dropped.