Re: How Not to Multihome

["Patrick W. Gilmore" <patrick () ianai net>]

On Oct 9, 2007, at 1:53 PM, Valdis.Kletnieks () vt edu wrote:

> > There are currently ~1500 prefixes with inconsistent origin AS.
> > These are trivially identifiable:
> >
> >    <http://www.cymru.com/BGP/incon_asn_list.html>
> >
> > 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? :)

--
TTFN,
patrick