Great outage of 1997 - Does anyone recall?

neal rauhauser nrauhauser at
Sun Feb 22 07:11:16 UTC 2009

 Well, I hope I'm not butchering the story up too badly - got an 800 word
piece going up Monday on The Cutting Edge News and I'm doing something more
lengthly and bloggy tonight for DailyKos, whilst hanging around abusing one
of our spare 7507s with various new IOS versions.

On Sun, Feb 22, 2009 at 12:55 AM, Patrick W. Gilmore <patrick at>wrote:

> On Feb 22, 2009, at 1:47 AM, Randy Bush wrote:
>  Does anyone have the full story on this?
>>> <>
>> bottom line:
>>  o do not redistribute bgp into igp
>>  o do not redistribute dynamic igp into bgp
>>  o filter your peers and customers
> And don't put all your most important infrastructure stuff (e.g. name
> server, mail server, shell host, etc.) in the first /24 of your /<shorter>
> allocation.
> The biggest problem with 7007 was not that it announced a bunch of
> prefixes.  It is that 7007 announced _classful_ prefix (it had been filtered
> through RIP, remember?) with AS_PATH of ^7007$.  This means if you had a
>, you saw from 7007, which is more specific.  Why
> this is bad is left as an exercise to the reader.
> And, of course, the problem persisted after the router in question was
> actually unplugged - not powered up or attached to any fibers/cables.  Thank
> you Sprint for running beta code. :)
> --
> patrick

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