docs: def calc_ethsw_port(self, port_num, port_def):
          """
          Split and create the port entry for an Ethernet Switch
  
          :param port_num: port number
          :type port_num: str or int
          :param str port_def: port definition
          """
          # Port String - access 1 SW2 1
          # 0: type 1: vlan 2: destination device 3: destination port
          port_def = port_def.split(' ')
          if len(port_def) == 4:
              destination = {'device': port_def[2],
                             'port': port_def[3]}
          else:
              destination = {'device': 'NIO',
                             'port': port_def[2]}
          # port entry
          port = {'id': self.port_id,
                  'name': str(port_num),
                  'port_number': int(port_num),
                  'type': port_def[0],
                  'vlan': int(port_def[1])}
          self.node['ports'].append(port)
          self.calc_link(self.node['id'], self.port_id, port['name'],
                         destination)
          self.port_id += 1