System and method for achieving stacking of rack type switching devices

The invention relates to data traffic transmission technology of route switching devices and discloses a method for achieving stacking of rack type switching devices, and the method solves the problems that a stacking system in the traditional technology can not provide a high bandwidth and can not achieve upgrade and backup of board cards. According to the system and the method, a stacking link is established between the stacking member devices through stacking ports of at least two stacking cards, at least two stacking cards of each stacking member device are connected with a switch card through high-speed channel ports, a first link aggregation unit is established at a stacking port, receiving a stacking negotiation message sent by the same stacking member device, of any stacking card and the stacking card submits received message information to a switch card of the stacking member device, and the switch card analyzes the message information submitted by all the stacking cards of all the stacking member de