[28776] in North American Network Operators' Group
Re: "Simple" Multi-Homing ? (was Re: CIDR Report)
daemon@ATHENA.MIT.EDU (Todd Sandor)
Tue May 16 08:02:52 2000
Message-ID: <39213C05.1CA1E511@home.com>
Date: Tue, 16 May 2000 08:16:05 -0400
From: Todd Sandor <tsandor@home.com>
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Let me summarize and ask this in a different way - the goal is to provide stability to end-users
[service
availability (HA)] and it requires cooperation between network service providers [a shorter
question
with a little spin to make the question fall within the charter of Nanog :-)]...The question is
How?
When customer in one location is using a multi-homed setup to two providers A and B, with A
being the primary (using one of the primary's /24s they've loaned to the customer) and B being
the
secondary (advertising B with a longer AS_path - simple case that uses default routes). When the
customers link to A fails, will the /24 that needs to be globably visible via B (a
non-aggregate IP
address for B) NOT be globably visible because of the BGP filtering policies of some other
provider
somewhere, say C ?
[I think I know the answer - which is "it will NOT be globally visible, but it depends ... e.g.
who A and B is,
etc.." but this is not the answer customer's want...They want a viable/reliable solution and I'm
not sure how you
go about providing it? [if its not possible, I'm stating the obvious, but this is a problem
that is only going to get bigger
as more /24 types want/require redundant links...i.e. It an operational issue, No?...]...
Todd Sandor wrote:
> Gee, just when I thought I got the required answers to my "simple" multi-homing questions
> ....
