Because you’re interested in “high performance,” you want to do everything possible to keep the cluster network from reducing performance. A common approach is to put the cluster on a private Ethernet network. The address space is unroutable, so the compute nodes will effectively be “hidden” from a routable network, allowing you to separate your cluster logically from a public network.

下面这段“unroutale”address space是什么意思？就是结点之间用交换机而不能用路由器？

用几层交换机合理呢？
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