Every time I mention overlay virtual networking tunnels someone starts worrying about the scalability of this approach along the lines of “In a data center with hundreds of hosts, do I have an impossibly high number of GRE tunnels in the full mesh? Are there scaling limitations to this approach?”
Not surprisingly, some ToR switch vendors abuse this fear to the point where they look downright stupid (but I guess that’s their privilege), so let’s set the record straight.
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