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Re: Bell Canada outage?
From: Jared Mauch <jared () puck nether net>
Date: Wed, 8 Aug 2012 15:55:15 -0400

On Aug 8, 2012, at 3:50 PM, Andree Toonk wrote:


.-- My secret spy satellite informs me that at 12-08-08 11:35 AM  Darius
Jahandarie wrote:
On Wed, Aug 8, 2012 at 2:31 PM, Zachary McGibbon
<zachary.mcgibbon+nanog () gmail com> wrote:
Anyone at Bell Canada / Sympatico can tell us what's going on?  Our routing
table is going nuts with Bell advertising a lot of routes they shouldn't be

Bell leaked a full table. To add to the fun, it seems that TATA took
the full table and releaked it.

A quick analysis leads met to believe AS46618 ( Dery Telecom Inc) is the
cause of this. AS46618 is dual homed to VIDEOTRON and Bell. What seems
to have happened is that they leaked routes learned from VIDEOTRON to Bell.

Based on BGP data I see that at 17:27 UTC  AS46618 ( Dery Telecom Inc)
started to leak a 'full table', or at least a significant chunk of it to
its provider Bell AS577.
Bell propagated that to it's peers. Tata was one of the ones that
accepted all of that.

I can see that Bell propagated at least 74,109 prefixes learned from
AS46618 to Tata. Tata selected 70,160 of those routes.

Taking a cursory look at the data processed by my now (very old) leak
auditing tool, this should give you an idea of the size of the impact...

bgp=# select count(*) from leakinfo where aprox_time::date='2012-08-08';
bgp=# select count(*) from leakinfo where aprox_time::date='2012-08-07';
bgp=# select count(*) from leakinfo where aprox_time::date='2012-08-06';

You can see details of this at the leak info page here:


- Jared

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