Re: Erroneous BGP advertisement

[Paul Fakler <pfakler () MR Net>]

> From: Bruce Robertson <bruce () greatbasin net>
... 
> Currently, one half of our /18 is being erroneously advertised by
> Sprint (207.228.0.0/19).  This, naturally, is causing us no end of
> trouble.  Sprint, meanwhile, blames a third party.  This has been
> going on for over 24 hours.
 
You have to make certain that your upstream provider(s) will accept all more
specific routes from you for networks in your CIDR block.  That way as soon 
as you notice a problem such as the one above for example, you could announce 
207.228.0.0/20 and 207.228.16.0/20 to the world.  Since you are announcing 
more specific routes you have immediately fixed your routing problem.  

THEN you beat up on the offender and offender's NSP to fix their announcement.
 
--
 
Paul.
 
*-----------------------------------------------------------------------*
| Paul W. Fakler                  |     Senior Network Engineer         |
*---------------------------------*-------------------------------------*
| Internet : pfakler () mr net       |   MRNet                             |
| My Desk  : +1 612 362-5818      |   Minnesota Regional Network        |
| Problems : +1 612 362-5800      |   2829 University Ave SE, Suite 200 |
| FAX      : +1 612 362-5899      |   Minneapolis, MN  55414, USA       |
*---------------------------------*-------------------------------------*