[51648] in North American Network Operators' Group
RE: AT&T NYC
daemon@ATHENA.MIT.EDU (alex@yuriev.com)
Tue Sep 3 12:57:41 2002
Date: Tue, 3 Sep 2002 12:57:46 -0400 (EDT)
From: alex@yuriev.com
To: "Feger, James" <jfeger@feger.net>
Cc: nanog@merit.edu
In-Reply-To: <Pine.LNX.4.33.0209031119340.6939-100000@stuttgart.feger.net>
Errors-To: owner-nanog-outgoing@merit.edu
>
> You keep referring to the problem of OSPF causing the outage
> for AT&T and unaffected customers. The AT&T released RFO simply states
> that OSPF network statements were removed. That can happen just as easy
> with static routes and BGP network/neighbor statements.
>
> OSPF did what it was instructed to do, just as BGP would have done if it
> were told to drop neighbors, or networks.
OSPF network statements were removed, according to RFO, which I have
received, on one router. Can you please explain to me why customers in other
*cities* which clearly were terminated into different routers were affected?
Since we know based on our emprirical observation that it did happen, it can
be concluded that AT&T has bad network design. It does not matter *why*
customers who were not terminated into the affected routers could not use
AT&T network. What matters is that they *could* b not use AT&T's network
because AT&T's engineering made a choice of using a broken design. This
broken design is going to cost AT&T a couple of million. Hopefully, at some
point a VP of Engineering for AT&T is going to realize that his job is going
to be on the line if stuff like this keeps happening, at which point certain
engineers within AT&T are going to get their heads handed back to them on a
platter. Again, hopefully at that point, those who remain at AT&T will
realize that their existing design is broken and another outage is going to
cost them their jobs and redo it. At the end we are going to have a lot more
stability on the internet.
As far as BGP would have done the same thing: would you mind desciring a
configuration of BGP where deletion of a network statement in one router
would cause unreachability across paths that do not *realy* on that network
statement?
Alex
