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RE: Router crash unplugs 1m Swedish Internet users
From: "Ben Buxton" <B.Buxton () Planettechnologies nl>
Date: Tue, 24 Jun 2003 08:46:39 +0200


On Mon, 23 Jun 2003, Jim Deleskie wrote:

One router and it takes there entire network off-line... 
Maybe someone needs
a Intro to Networks 101 class.

Well, if the memory errors corrupts the forwarding table 
placed on the 
line cards or something similar, and still keeps its 
adjacancies up, then 
you can get these problems. I've seen it happen on 
route-cache boxes where 
certain entries in the ip-forwarding table was corrupted and thus 
incorrectly routed.

Oooh I had one of these once - a bug in the forwarding engine of a J-box
caused all through traffic to drop whilst maintaining adjacencies and
VRRP mastership. It took two incidents to determine what the cause of
the fault was.

So much for redundancy...

Fortunately it was at the tail end of a maintenance window.
Unfortunately
it affected a similar size user base to the Telia fault (but luckily it
seems no-one noticed enough to publicise it :)

BB


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