code: def connection_made(self):
          
          assert self.state == BGP_FSM_CONNECT
          # We have a connection with peer we send open message.
          open_msg = self._peer.create_open_msg()
          self._holdtime = open_msg.hold_time
          self.state = BGP_FSM_OPEN_SENT
          if not self.is_reactive:
              self._peer.state.bgp_state = self.state
          self.sent_open_msg = open_msg
          self.send(open_msg)
          self._peer.connection_made()
docs: Connection to peer handler.
  
          We send bgp open message to peer and initialize related attributes.