[outages] Level 3 routing issue

Scott Howard scott at doc.net.au
Tue Aug 18 02:44:52 EDT 2009


On Tue, Aug 18, 2009 at 8:41 AM, Monika Bajwa <mbajwa75 at yahoo.com> wrote:

> Level 3 had a routing loop problem in San francisco on 8/8-8/9. We had
> issues with
> Comcast customers being able to access some websites. Did anyone see
> anything similar ?
>

Yes.  Started at 3:36am Pacific, and ended at 4:12am.

Looks like level 3 were advertising their US routes out of London, with
latency from non-L3 in San Francisco to multiple Level 3 around 200ms and
near 100% packet loss.


  2  10gigabitethernet1-1.core1.sjc2.he.net (72.52.81.178)  10.484 ms
13.600 ms  4.616 ms
  3  10gigabitethernet1-3.core1.nyc4.he.net (72.52.92.26)  90.816 ms  86.060
ms  79.697 ms
  4  10gigabitethernet1-2.core1.lon1.he.net (72.52.92.78)  160.023 ms
149.021 ms  157.903 ms
  5  * * *
  6  * * *
  7  * * *

  Scott.
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