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We found that the
main problem was gigapops who
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advertise unequal
prefix length announcements to their
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ISP and Abilene.
If everyone’s were equal would be fine.
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But we discovered
that it’s unfortunately fairly common
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for GPs to
aggregate towards Abilene and not aggregate
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or aggregate less
towards their ISPs, very undesirable
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So when NLM saw a
route and sent traffic to MAX, a
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more specific
Qwest route not advertised to them could
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take precedence,
and yet they hadn’t subscribed to
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Qwest ISP . So that traffic would be dropped.
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After some
attempts to get sources to fix it we gave up.
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