[110258] in North American Network Operators' Group
Re: Failover solution using BGP
daemon@ATHENA.MIT.EDU (Roland Dobbins)
Wed Dec 31 13:48:45 2008
From: Roland Dobbins <rdobbins@cisco.com>
To: nanog@nanog.org
In-Reply-To: <871vvomk5r.fsf@mid.deneb.enyo.de>
Date: Thu, 1 Jan 2009 02:48:32 +0800
Errors-To: nanog-bounces@nanog.org
On Dec 31, 2008, at 11:36 PM, Florian Weimer wrote:
> DNS tweaks won't help with that (and to be honest, BGP doesn't
> address it, either).
After all, there ought to be an internal line of communication as well
as the external one, and the availability probes can be set up with
logic such that if one side has bidirectional comms and the other
doesn't, the desired behavior (whatever that may be, dependent upon
which side has full comms) can be enforced.
Couple that with a stateless front-end - which could also afford
active/active in that tier, even if the back-end is monolithic - and
it's more nearly a complete solution, with more options, granularity,
and safeguards available, than one based upon routing alone.
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Roland Dobbins <rdobbins@cisco.com> // +852.9133.2844 mobile
All behavior is economic in motivation and/or consequence.
