Example. Connect N=128 nodes, with Pe=Pc=36 ports and a blocking factor Bl=1. Calculate
E and C, the number of edge and core switches, respectively.
As Bl=1, Eptn=Eptc=Pe/2=18.
Then, E=Ceil (N/Eptn)=Ceil (7,1)=8.
B=Pc div E=36 div 8=4.
C=Ceil (Eptc/B)=Ceil (18/4)=Ceil (4,5)=5.
The answer is: E=8, C=5.
As Bl=1, Eptn=Eptc=Pe/2=18.
Then, E=Ceil (N/Eptn)=Ceil (7,1)=8.
B=Pc div E=36 div 8=4.
C=Ceil (Eptc/B)=Ceil (18/4)=Ceil (4,5)=5.
The answer is: E=8, C=5.
本文通过一个具体例子展示了如何计算网络中的边缘交换机(E)和核心交换机(C)的数量。假设网络连接了128个节点,每个节点拥有36个端口,且阻塞因子为1。首先计算得到每台边缘和核心交换机的有效端口数量为18,接着得出边缘交换机总数为8,最后确定核心交换机数量为5。
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