AT&T prefix flapping?

Fri Oct 16 20:26:26 UTC 2009

Hi all,
For the past two months, 
it seems that AS7132 (SBIS-AT&T) announces and withdraws about 1,500 prefixes to AS7018 (AT&T) monitor every ~80 seconds.  This observation is based on AT&T's monitor peering with RouteViews and RIPE.
Does anyone know what's going on?
Thanks,
Jonathan  		 	   		  
_________________________________________________________________
Your E-mail and More On-the-Go. Get Windows Live Hotmail Free.
http://clk.atdmt.com/GBL/go/171222985/direct/01/