Virtual stack system is able to simplify the network structure and improve network reliability.However,when the topology of stack contains 3 or more device of loop connection,it will cause message looping and affect the network reliability.Based on the purpose of preventing the message looping of stack,this paper starts from the flow direction of stack.By analyzing the message forwarding path,this paper puts forward the algorithm of source quench entry to prevent the message looping and explains the reason why the stack of 2 device cannot make the loop connection.Finally,it proves the feasibility of the algorithm by means of experiment and improves the network reliability.%IRF虚拟化堆叠技术能够简化组网结构,提高网络稳定性.但是当堆叠的拓扑结构为三台以上的设备环形连接时,会导致报文成环进而影响整个网络的稳定性.基于防止堆叠系统报文成环的目的,文章从堆叠系统内部的流量走向入手,通过分析四框环堆系统的流量转发路径,提出了源抑制表项的算法,成功阻止了报文成环,并用此算法解释了两框堆叠无法形成环形连接的原因.最后通过实验证明此算法的可行性,并提高了堆叠技术的稳定性.
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