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Re: Is the export policy selective under valley-free?

  • From: William Waites
  • Date: Wed Sep 03 13:43:50 2008 
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Le 08-09-03 à 19:26, [email protected] a écrit :

OK, I'm looking at this, and having a *little* trouble buying that there's
exactly zero or one p2p links - consider the case where the last 'c2p' link
is to provider A, who peers with B but not C, and B peers with both A and C,
and the first p2c link lands at C. Don't you end up with "cp2 p2p p2p p2c" in
that case? Or is there a convention saying we compress the A-B and B-C
links into a notational A-C link? Or are we defining A-B or B-C links as
being a c2p type instead, even though they're peering and not transit?

If B passes along C's routes to A then that is not (in the model) a peering
relationship. Only your own and your customers' routes get sent to peers not
routes learned from other peers.

So in this case B-C looks like p2c and A-B could be either p2p or c2p.

Cases of partial transit, where B might repeat C's routes to peers but not
to upstrem providers are not, AFAIK treated in the model.

Cheers,
- -w

- --
William Waites                       <[email protected]>
http://www.irl.styx.org/          +49 30 8894 9942
CD70 0498 8AE4 36EA 1CD7  281C 427A 3F36 2130 E9F5

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