North American Network Operators Group
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Re: AMS-IX problems

  • From: Mike Hughes
  • Date: Wed Oct 23 07:29:49 2002 
On Wed, 23 Oct 2002, Stephen J. Wilcox wrote:

> 
> > It's very interesting to see the traffic stats at
> > http://www.ams-ix.net/hugegraph.html Usually, incoming and outgoing
> > traffic is the same. But during this problem, much more traffic went out
> > than came in.
> 
> Curious, as the exchange sources no traffic that shouldnt really be possible ;)
> 
> (unless the graphs are inaccurate)

If there is something nasty happening with STP, or traffic is flooding,
you will count the same traffic several times - once for each egress port
that it hits - hence aggregate traffic out > traffic in.

Broadcast traffic is also counted multiple times in aggregated stats.

Mike