In message <960606181706.9ede@SDG.DRA.COM>, Sean Donelan writes:
Does anyone know what's going on in Canada?
In the last couple of weeks fONOROLA/iStar.net changed how they announce aggregated networks. Now fONOROLA is sending some more specific network announcements for multi-homed networks in 198.53.0.0 with a "no-export" BGP community to MCI, and ANS.
As long as you only connect with MCI or ANS, and use their IGP, things look pretty typical because the more specifics are carried internally. But if you use BGP, the no-export means any peers with MCI won't see the more specific network announcement from MCI.
The problem shows up when you see routes from Sprintlink. A few Canadian network connect through Sprint/Canada as well as fONOROLA. The more specific networks from 198.53 are announced by Sprintlink. Since the no-export suppressed the more specific announcement to MCI BGP peers, the traffic for those Canadian sites follows the more specific network announcement and heads for Sprint.
I understand the BGP mechanics are working as specified, so it isn't "broken" per se. But I'm just wondering if Canadian sites really expect traffic to go via Stockton, California?
I haven't been able to reach anyone at fONOROLA/Istar. I was just wondering if any other North American network operators had heard what was supposed to happen last month when fONOROLA made these changes. -- Sean Donelan, Data Research Associates, Inc, St. Louis, MO Affiliation given for identification not representation
Sean, I can't speak for Istar, but I do know that they had tried to make this a painless aggregation by indicating to both ANS and MCI which prefixes were in their aggregates that did not need to be advertised outside of ANS and MCI. Istar saved some 750 prefixes. I think this is roughly half what they had previously been announcing and they have over 3500 prefixes registered, indicating a lot were already site aggregated. This is certainly commendable. Unfortunately, since there is no way for them to know which Istar prefixes also have connectivity through Sprint or someone else (with Sprint failing to register this in the IRR), there is no way that Istar can determine that those component have to be passed on by ANS and MCI except to aggregate and see what breaks. This is the type of "information exchange" and provider cooperation through the IRR that we have been talking about that isn't universally accepted. As this type of non-trivial aggregation becomes more common, we can expect this sort of thing to be a regular occurance unless certain other providers take the time to register things. Yes, we know it is work, but nothing near the work Istar did to get these prefixes aggregated with as little disruption as possible. The more specific prefixes blocked by ANS and MCI are listed below. We can determine which are heard from Sprint with a routing dump and unblock them. This is the "break it, see what broke, then fix it" method, but the end result will work. Cheers, Curtis echo '( AS2493 AND ANSIGPONLY )' | Peval ({204.191.254.0/24, 204.191.9.0/24, 204.191.182.0/24, 198.53.169.0/24, 198.53.159.0/24, 204.191.76.0/24, 204.191.176.0/24, 204.191.111.0/24, 198.53.239.0/24, 204.191.20.0/24, 204.191.85.0/24, 198.53.33.0/24, 204.191.105.0/24, 198.53.173.0/24, 204.191.187.0/24, 204.191.163.0/24, 198.53.183.0/24, 204.191.119.0/24, 204.191.4.0/24, 204.191.126.0/24, 198.53.158.0/24, 198.53.224.0/24, 198.53.228.0/24, 198.53.223.0/24, 198.53.211.0/24, 198.53.164.0/24, 204.191.14.0/24, 204.191.10.0/24, 198.53.19.0/24, 204.191.125.0/24, 205.206.16.0/24, 204.191.60.0/24, 198.53.144.0/24, 198.53.197.0/24, 198.53.217.0/24, 198.53.178.0/24, 204.191.98.0/24, 204.191.58.0/24, 204.191.188.0/24, 198.53.26.0/24, 204.191.174.0/24, 204.191.97.0/24, 204.191.49.0/24, 198.53.184.0/24, 204.191.211.0/24, 198.53.16.0/24, 198.53.176.0/24, 198.53.168.0/24, 204.191.28.0/24, 204.191.233.0/24, 204.191.30.0/24, 204.191.207.0/24, 204.191.224.0/24, 198.53.230.0/24, 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