We received Cyclops alerts for one of our /24's. It claimed that the prefix
was being announced by a provider in Hong Kong. Our alerts fired between
10:36:30 and 10:40:36 UTC today, 2010-11-25. The longest time period that
any alert was active was 2m 58s.
All appears to be well at this moment; the prefix is not being announced by
that provider according to routeviews.org.
It is highly unusual for us to receive alerts. We have only 5x /24 networks
being monitored. Given that you received similar alerts less than 1.5 hr
later, I wonder if this was a systemic problem.
Sr. Network Engineer
Mizuho Securities USA Inc
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From: ML [mailto:email@example.com]
Sent: Thursday, November 25, 2010 4:26 PM
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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