3356 leaking routes out 3549 lately?

Chip Marshall chip at 2bithacker.net
Fri Mar 28 19:42:12 UTC 2014

On 2014-03-28, David Hubbard <dhubbard at dino.hostasaurus.com> sent:
> Has anyone had issues with Level 3 leaking advertisements out their
> Global Crossing AS3356 for customers of 3549, but not accepting the
> traffic back?  We've been encountering this more and more recently,
> bgpmon always detects it, and all we ever get from them is there's
> nothing wrong.  Today it affected CloudFlare's ability to talk to us.
> It seems to happen mostly with Europe and Asian peering points.
> Typically lasts five to ten minutes which makes me think someone working
> on merging the two networks is doing some 'no one will notice this'
> changes in the middle of the night.

I'm not sure if it's the same thing, but I've had a few alerts
from Renesys lately seeing a path to my AS via GLBX 3549 that
shouldn't exist, as we only have connections with Level 3 3356.

For example, Renesys reports "x 3549 33517" where it should only
be able to see "x 3356 33517" or maybe "x 3549 3356 33517".

(Due to Renesys policy, I can't know what x is)

Chip Marshall <chip at 2bithacker.net>
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