[98667] in North American Network Operators' Group
Re: inter-domain link recovery
daemon@ATHENA.MIT.EDU (Roland Dobbins)
Wed Aug 15 04:56:30 2007
In-Reply-To: <200708151507025317576@ieee.org>
From: Roland Dobbins <rdobbins@cisco.com>
Date: Wed, 15 Aug 2007 01:13:30 -0700
To: nanog <nanog@merit.edu>
Errors-To: owner-nanog@merit.edu
On Aug 15, 2007, at 12:07 AM, Chengchen Hu wrote:
> is it always possible for BGP to automatically find an alternative
> path when failure occurs if exist one? If not, what may be the causes?
Barring implementation bugs or network misconfigurations, I've never
experienced an operational problem with BGP4 (or OSPF or EIGRP or IS-
IS or RIPv2, for that matter) converging correctly due to a flaw in
the routing protocol, if that's the gist of the first question.
There are many other factors external to the workings of the protocol
itself which may affect routing convergence, of course; it really
isn't practical to provide a meaningful answer to the second question
in a reasonable amount of time, please see the previous reply.
The questions that you're asking essentially boil down to 'How does
the Internet work?', or, even more fundamentally, 'How does routing
work?'. I would strongly suggest familiarizing oneself with the
reference materials cited in the previous reply, as they provide a
good introduction to the fundamentals of this topic.
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Roland Dobbins <rdobbins@cisco.com> // 408.527.6376 voice
Culture eats strategy for breakfast.
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