为了设计出精简、高效的互连网络协议，实现高性能机群互连网络，提出了适合机群系统互连网络的链路层协议框架，讨论了停等和退后Ｎ帧协议，并采用ＦＰＧＡ（ＦｉｅｌｄｐｒｏｇｒａｍｍａｂｌｅＧａｔｅＡｒａｙ）芯片分别实现了这２种协议方案，对它们的性能进行了分析．结果表明，退后Ｎ帧协议比停等协议具有更好的性能，而且实现２个协议的逻辑电路所占用的ＦＰＧＡ资源基本相同． In order to design streamlined and efficient interconnection network protocol and realize high performance cluster interconnection network, a link layer protocol framework suitable for cluster system interconnection network is proposed. The protocol of stop and wait and back of N frame is discussed and FPGA (Field programmable Gate Array) chip, respectively, to achieve these two protocols, their performance were analyzed. The results show that the back-up N-frame protocol has better performance than the stop-and-wait protocol, and the FPGA resources occupied by the logic circuits that implement the two protocols are basically the same.