Cogent announcing more specific prefixes?

Neil Robst Neil.Robst at
Fri Nov 26 02:36:14 CST 2010

Yeah, I saw the same - saw an extra /22 announced...

-----Original Message-----
From: ML [mailto:ml at] 
Sent: 25 November 2010 22:26
To: nanog at
Subject: Cogent announcing more specific prefixes?

Anyone else get alerts from their BGP monitoring system (In my case 
Cyclops) saying Cogent briefly announced some more specific prefixes?

AS path as reported by Cyclops: 7575 46135 174 174

/20s broken into /23s
/23s became /24s

Also saw alerts for one to one (/23 announced has /23)

All alerts had a timestamp of: 2010-11-25 12:01:12 UTC

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