[c-nsp] Routing Problem - MCI/GT/Level3 - Puzzled

[Mark Tinka]

On Wednesday 14 February 2007 21:17, Paul Stewart wrote:

> When we turned up our MCI connection, our performance was very
> poor.  What I mean is that they were doing about 10% of our
> traffic in total.  I can verify our routes are leaving MCI's
> network just fine (my first thought) but I cannot figure out why
> (given their AS size) someone like Group Telecom is outperforming
> them almost 5 times the traffic, if not even more.  Level(3) is
> just "humming along" with it's normal traffic levels....

Various networks have their own internal routing policies that 
supercede your own prepending techniques, e.g., LOCAL_PREF, e.t.c.

Another method to get your inbound traffic down the link you want is 
to announce longer prefixes to/through that upstream. Longer 
prefixes are almost always guaranteed to steer traffic the way you 
want, regardless of your upstream's internal routing policies.

Naturally, the longest you should be able to do is a /24.

Mark.
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