Use of Default in the DFZ: banned in philly, see it now on the net!

Michael K. Smith - Adhost mksmith at adhost.com
Wed Jun 24 13:18:32 CDT 2009


That was my assumption when I checked the "UCLA is wrong" button on the
form.  We only have one downstream, but it's a distinct ASN so that says
"not stub" to me.

Mike

Randy top posting - will wonders never cease.

> -----Original Message-----
> From: Randy Bush [mailto:randy at psg.com]
> Sent: Wednesday, June 24, 2009 10:58 AM
> To: Ricardo Oliveira
> Cc: NANOG list
> Subject: Re: Use of Default in the DFZ: banned in philly,see it now on
> the net!
> 
> OK,a buckety of salt.
> 
>  From my pov, a stub has zero downstreams.
> 
> randy, on iPhone
> 
> On Jun 24, 2009, at 10:39, Ricardo Oliveira <rveloso at cs.ucla.edu>
> wrote:
> 
> > Jack,
> > Please give me your ASN and i'll double check our data. As long as
> > the network has 4 or less downstreams, it's  being labeled as
"stub".
> > More details here:
> > http://www.cs.ucla.edu/~rveloso/papers/completeness-ton.pdf
> >
> > Thanks,
> >
> > --Ricardo
> >
> > On Jun 24, 2009, at 6:44 AM, Jack Bates wrote:
> >
> >> Randy Bush wrote:
> >>> please do check your as at <http://psg.com/default/> and then
> >>> actually
> >>> look at your router config.  i found one of my routers still had a
> >>> default from when i was bringing it up.
> >>
> >> Ick. Nothing was right. Reported as mixed, though that may be my
> >> fault and not your testing. Hmmm. Or your test didn't take some
> >> things into account like changes over time. Normally I keep a
> >> default route available, but due to changing IGP internally I
> >> actually have a default which points interior from the edge
> >> routers. So when I shut down the last BGP session on the old cisco,
> >> the defaults to the transits went away.
> >>
> >> Was also reported as a stub. Glad to know that I don't have BGP
> >> customers. Oh, wait, I do. :)
> >>
> >>
> >> Jack
> >





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