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Re: [altoext] General Applicability of a Cost Graph?

DIEGO LOPEZ GARCIA <diego@tid.es> Sun, 22 April 2012 22:24 UTC

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Date: Mon, 23 Apr 2012 00:24:54 +0200
From: DIEGO LOPEZ GARCIA <diego@tid.es>
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To: Ben Niven-Jenkins <ben@niven-jenkins.co.uk>
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Cc: "altoext@ietf.org" <altoext@ietf.org>, Greg Bernstein <gregb@grotto-networking.com>
Subject: Re: [altoext] General Applicability of a Cost Graph?
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On 16 Apr 2012, at 22:44 , Ben Niven-Jenkins wrote:
> In the CDN use cases I have I need finer granularity of network topology than a peer to peer client[1] but I still only require an abstract view of the topology - i.e. I don't need to know about individual links/routers or about the topology between CDN locations etc.
>
> So a good part of the value of an ALTO server/solution is that it performs that abstraction for me. For the large bandwidth use cases I get the impression that knowing detailed topology is important and so ALTO is not really performing the role of an abstraction layer and is just performing the role of an API to obtain topology information.
>
Not necessarily. In the high bandwidth use case you'll probably be interested
in a more detailed view of certain aspects, but there is no need of being
aware of all the topology details.

In the scenarios under consideration a certain link may well model several
aggregated links, for which the server provides the necessary abstraction. In a
project I am currently involved we speak about "offers", which provide certain
values for cost functions, and each of these offers does not have to correspond
with a single link.

Be goode,


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