I second that prepending is not 100% secure.
And it's not only your ISP local preference, is any ISP local preference
that gets to know both paths. Been there.
Holes (longer prefixes) may help, but some ISPs do not (rightfuly)
accept them. And you are doing no good to the Internet at large.
Conditional advertising, on the other hand, is bullet proof and
goes easy on the global BGP table size. The downside is convergence
time.
-Carlos
Tech Guy @ 1/09/2010 0:58 -0300 dixit:
> I have to disagree with both Paul & Tyson.
>
> My real word answer is that AS-prepend will not always do the job for
> you (no matter how many you prepend), when you want to use the second
> ISP connection purely as the backup.
>
...
-- Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina Blogs and organic groups at http://www.ccie.netReceived on Thu Sep 02 2010 - 09:50:06 ART
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