Hi All:

Looking at the /ryu/ofproto/ofproto_v1_3.py, seems like its "unicast" mask of 
"255.255.255.255" vs not?

        if self._wc.ft_test(ofproto_v1_3.OFPXMT_OFB_IPV4_SRC):
            if self._wc.ipv4_src_mask == UINT32_MAX:
                header = ofproto_v1_3.OXM_OF_IPV4_SRC
            else:
                header = ofproto_v1_3.OXM_OF_IPV4_SRC_W
            self.append_field(header, self._flow.ipv4_src,
                              self._wc.ipv4_src_mask)

But the same questions goes for META_DATA, whats the difference there?

@OFPMatchField.register_field_header([ofproto_v1_3.OXM_OF_METADATA,
                                      ofproto_v1_3.OXM_OF_METADATA_W])


Much Thanks
Morgan Yang
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