Matt Thompson provided a really good answer to the “what’s acceptable oversubscription ratio in a ToR switch” when he wrote “I’m expecting a ‘how long is a piece of string’ answer” (note: do watch the BBC video answering that one).
There’s the 3:1 rule-of-thumb recipe, with a more realistic answer being “it depends”. Now let’s see if we can go beyond that without a deep dive into scholastic waters.
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