In multistage topologies , higher level switching nodes connect to lower level switching nodes as shown in figure 1 , where switching nodes in rank 0 connect to processor nodes directly while switching nodes in rank 1 connect to switching nodes in rank 0 .
In multistage topologies , higher level switching nodes connect to lower level switching nodes as shown in figure 1 . 
 Switching nodes in rank 0 connect to processor nodes directly while switching nodes in rank 1 connect to switching nodes in rank 0 .