North American Network Operators Group

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Re: seeing the trees in the forest of confusion

  • From: Larry Rosenman
  • Date: Sat Apr 26 15:19:44 1997

Avi Freedman wrote:
> > I agree that there appears to be some underlying problem with the BGP code
> > on the backbone that is delaying route withdrawals beyond a reasonable
> > time.  We ran into a similar problem Wednesday night where one of our
> > customers started advertising more specifics for our network blocks to
> > another transit provider (who does not filter customer routes). After
> > shutting down the customer's BGP peering, the bogus routes were still in
> > the table an hour later at which time we started advertising our own more
> > specifics to restore service to our other customers -- this lead to our
> > unfortunate position in Thursday's CIDR report.
> 
> Were they in as dampened; history; or just in as if they were in and had
> not flapped?
Dampened is what I saw looking at the digex looking glasses.  And some
of them had times >1 hour.
> 
> Dampening of more specific bogus announcements is a problem I'd like to
> see addressed, since the more general (and correct) routes won't be used
> if more specifics are dampened.
I agree that this is a problem.

Larry Rosenman
CyberRamp.net (AS6243)