ToR switches are often 1RU and approximately 48 ports – this would provide one uplink for each server if all 42RU of a rack is filled with 1 RU servers. The ToR switches will allow servers to communicate with each other directly, and therefore reduces overall traffic on core switching. It’s the practice of placing a physical switch within each rack, so that the network switching for the rack is close to the servers or devices that need to connect to it. You may know about ToR, top-of-rack (for) switches.
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