North American Network Operators Group

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Re: How Not to Multihome

  • From: Patrick W. Gilmore
  • Date: Tue Oct 09 14:17:04 2007

On Oct 9, 2007, at 1:53 PM, [email protected] wrote:

There are currently ~1500 prefixes with inconsistent origin AS.
These are trivially identifiable:


Some of them are obvious mistakes (I doubt HKSuper is supposed to
originate 4/8).  But many of them are not, and the Internet works
just fine.

And as Justin said, some sizable fraction of those 1500 prefixes are
quite possibly *appearing* to Work Just Fine currently, but if something
breaks, that will be 1500 NOC monkeys facing some difficult-to-debug
routing issues....

Considering the number of inconsistently originated prefixes has been non-trivial for at least a decade, I have trouble believing this is a huge threat to the internet. Or even those 1500 NOC monkeys. (And wouldn't it be 3K - at least 2 ASNs per prefix? :)