This object indicates the protocol specified as the flow feature.
'hwIpfpmDcpFlowSrcPortBgn', 'hwIpfpmDcpFlowSrcPortEnd',
'hwIpfpmDcpFlowDstPortBgn', and 'hwIpfpmDcpFlowDstPortEnd' can be
configured only when the value is 6(tcp) or 17(udp). The value 0
represents that this object is not configured.