Router problems?

cowie at renesys.com cowie at renesys.com
Thu Nov 8 12:19:10 UTC 2001


Sean wrote:
> 
> Is there another poison BGP route floating around tonight?  I'm
> seeing odd routes across several providers, and routes are coming
> and going.

We routinely monitor the traffic dynamics of about 40 BGP feeds at 
http://gradus.renesys.com, looking for things like this.

There was a fair amount of garden-variety spiky noise last night, including 
small globally cross-correlated withdrawal bursts at a few points, but 
nothing that I would characterize as truly odd.  Some reserved AS 
leakage,  but no poison routes, and no sign of the announcement/withdrawal 
storms that generally accompany them.  

There could certainly have been specific problems with specific 
networks or providers that wouldn't lead to globally correlated instability,
and therefore wouldn't have triggered an alert from us.  If we have a  
BGP feed from the company in question, we generally catch incipient 
instability even in the absence of correlation and can issue 
them a private warning. 

Hint, hint. --jim




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