Hi Vijay,
> -----Original Message-----
> From: Vijay K. Gurbani [mailto:[email protected]]
> Sent: Tuesday, February 18, 2014 10:26 PM
> To: Songhaibin (A); alto
> Subject: Re: [alto] ALTO agenda for London IETF
>
> On 02/17/2014 07:37 PM, Songhaibin (A) wrote:
> >> o (Standards Track) Protocol extensions to convey a richer set of
> >> attributes to allow applications to determine not only "where" to
> >> connect but also "when" to connect. Such additional information will
> >> be related both to endpoints (e.g. conveying server load and cache
> >> geolocation information for CDN use cases) and to
> >> endpoint-to-endpoint costs (e.g. bandwidth calendaring to represent
> >> time-averaged cost values in datacenter networks). (19')
> >
> > This gives me a feeling that the protocol attributes extensions will
> > only consider the time based attributes. But I think overlay layer
> > path cost, i.e., you do not give only the source address and
> > destination address, but also give the intermediate node address to
> > retrieve the cost value for the overlay layer path, is also useful in
> > some scenarios such like CDN network, and can be easily achieved by
> > extending the protocol attributes.
>
> Haibin: There is certainly nothing constraining the protocol attribute
> extensions
> to temporal properties. However, it seems to me that your particular use
> case may be better approached through cost computations over a graph
> representation. But, as always is the case, the devil is in the details.
>
Cost computation over a graph representation does not work if the cost value is
"ranking", and it does not work either if the cost value is numeric but cannot
be computed over. Like you said, the devil is in the details. Giving the cost
value over a path directly may be the easiest way to do it.
BR,
-Haibin
> Cheers,
>
> - vijay
> --
> Vijay K. Gurbani, Bell Laboratories, Alcatel-Lucent
> 1960 Lucent Lane, Rm. 9C-533, Naperville, Illinois 60563 (USA)
> Email: vkg@{bell-labs.com,acm.org} / [email protected]
> Web: http://ect.bell-labs.com/who/vkg/ | Calendar: http://goo.gl/x3Ogq
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