[outages] routing loop in cogent?

[Daniel Corbe]

You should have kept the traceroute running.  They might be passing  
packets back and fourth a couple of dozen times as a practical joke  
before eventually delivering the traffic to the next hop.

Cogent = WIN

On Jun 23, 2008, at 6:3911 000PM, Josh Fiske wrote:

> Is anyone else seeing some routing loops in Cogent's network?
>
> ala:
>
> ...
> 18  gi9-16.mpd01.iad01.atlas.cogentco.com (154.54.11.213)  34.475  
> ms  36.336 ms  34.087 ms
> 19  uslec.iad01.atlas.cogentco.com (154.54.11.214)  39.286 ms   
> 38.188 ms  37.530 ms
> 20  gi9-16.mpd01.iad01.atlas.cogentco.com (154.54.11.213)  33.148  
> ms  37.066 ms  35.823 ms
> 21  * uslec.iad01.atlas.cogentco.com (154.54.11.214)  38.403 ms   
> 37.534 ms
> 22  gi9-16.mpd01.iad01.atlas.cogentco.com (154.54.11.213)  35.051  
> ms  33.120 ms  34.209 ms
> 23  uslec.iad01.atlas.cogentco.com (154.54.11.214)  39.112 ms * *
> 24  gi9-16.mpd01.iad01.atlas.cogentco.com (154.54.11.213)  34.603  
> ms  34.994 ms  34.119 ms
> 25  * uslec.iad01.atlas.cogentco.com (154.54.11.214)  36.929 ms   
> 38.443 ms
> 26  gi9-16.mpd01.iad01.atlas.cogentco.com (154.54.11.213)  34.784  
> ms  35.317 ms  33.839 ms
> 27  uslec.iad01.atlas.cogentco.com (154.54.11.214)  37.185 ms   
> 38.327 ms  39.863 ms
> 28  gi9-16.mpd01.iad01.atlas.cogentco.com (154.54.11.213)  35.362  
> ms  36.451 ms  34.788 ms
> 29  uslec.iad01.atlas.cogentco.com (154.54.11.214)  38.600 ms   
> 39.782 ms  40.031 ms
> 30  gi9-16.mpd01.iad01.atlas.cogentco.com (154.54.11.213)  38.156  
> ms  39.726 ms  35.726 ms
> 31  uslec.iad01.atlas.cogentco.com (154.54.11.214)  47.281 ms   
> 37.617 ms  49.460 ms
> 32  gi9-16.mpd01.iad01.atlas.cogentco.com (154.54.11.213)  35.389  
> ms  35.988 ms  35.609 ms
> 33  uslec.iad01.atlas.cogentco.com (154.54.11.214)  39.162 ms   
> 121.744 ms^C
>
>
> - - - -
> Joshua Fiske '03, '04
> Network and Security Engineer
> Clarkson University, Office of Information Technology
> (315) 268-6722 -- Fax:  (315) 268-6570
> GPG Key:  http://clarkson.edu/~jfiske/jfiske_pub.asc
> jfiske at clarkson.edu
>
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