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