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I'm reading this whitepaper and trying to wrap my head around why it would require O(N^2) entries for MAC address learning in OpenFlow with single table. See paragraph 2.2.1. In my naive mind, I think for every MAC address you would basically have an entry that says:

Source: *, Dst: <some MAC address>, out_port: <port that MAC was seen/learned on>

so you would end up with O(N). What are the other required entries?

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