common method to count traffic volume on IX

Niels Bakker niels=nanog at
Thu Sep 19 11:36:48 UTC 2013

* nick at (Nick Hilliard) [Thu 19 Sep 2013, 01:38 CEST]:
>On 18/09/2013 23:55, Niels Bakker wrote:
>>Ding ding ding!  And that's why honest IXPs graph both, to show 
>>that they have no packet loss on their inter-switch links.
>If in > out, it's not necessarily inter-switch packet loss.  The 
>difference between the two will also include packet loss for 
>same-switch egress traffic on customer ports.

That's absolutely true, I was a bit too glib in the quoted mail.

	-- Niels.

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