North American Network Operators Group
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Re: Unique AS

  • From: Stephen J. Wilcox
  • Date: Mon Jul 14 03:45:30 2003 
On Mon, 14 Jul 2003, Chris Luke wrote:

> 
> Adonaylo, Gabriel wrote (on Jul 14):
> > Could anyone describe pros and cons of having a unique AS for this
> > kind of networks rather than having one AS for each country. Regardless of
> > the cons, we are facing migration process anytime soon, so I would
> > appreciate very much to get more pros than cons to include in my papers
> > which are almost finished!
<snip>
 
> The downside of a confederation approach, and of others too in similar
> circumstances, is that if the confederation gets split (by router or line
> failure etc) then the two halves cannot speak to each other, regardless
> of how much Transit or peering you have. You won't import routes from
> a regular EBGP peer that have your own ASN in the path. Thus, if you do
> have a confed ASN per country, you need to ensure your inter-country
> connectivity is up to scratch to avoid this scenario.

Presumably you can mitigate with allow-own-as to ensure you can connect your 
countries together over transits...

Steve