code: def get_lldp_tlv(self, port_name, is_ncb=True, is_nb=False):
          
          reply = None
          if is_ncb:
              reply = self.run_lldptool(["get-tlv", "-n", "-i", port_name,
                                         "-g", "ncb"])
          elif is_nb:
              reply = self.run_lldptool(["get-tlv", "-n", "-i", port_name,
                                         "-g", "nb"])
          else:
              LOG.error("Both NCB and NB are not selected to "
                        "query LLDP")
          return reply
docs: Function to Query LLDP TLV on the interface.