Sebastian,
On 25 Mar 2013, at 08:31, Sebastian Kiesel wrote:
> Dear all,
>
> draft-ietf-alto-protocol-14, section 9.1.2.5. says: "An ALTO Server MAY
> omit entries for which a Path Cost is not defined (e.g., both the Source
> and Destination PIDs contain addresses outside of the Network Provider's
> administrative domain)."
>
> I think it would be beneficial to have an (optional) method of specifying
> a default value in the header of the map.
Are you suggesting the default cost replace the unknown cost semantic or that
we keep the unknown cost semantic and add an additional default cost semantic?
Thanks
Ben
>
>
> For example, in today's encoding:
>
> Content-Type: application/alto-costmap+json
>
> {
> "meta" : {},
> "data" : {
> "cost-mode" : "numerical",
> "cost-type" : "routingcost",
> "map-vtag" : "1266506139",
> "map" : {
> "PID1": { "PID1": 10, "PID2": 5, "PID3": 10 },
> "PID2": { "PID1": 5, "PID2": 10, "PID3": 20 },
> "PID3": { "PID1": 10, "PID2": 20, "PID3": 10 }
> }
> }
> }
>
>
> could become:
>
> Content-Type: application/alto-costmap+json
>
> {
> "meta" : {},
> "data" : {
> "cost-mode" : "numerical",
> "cost-type" : "routingcost",
> "cost-default" : 10,
> "map-vtag" : "1266506139",
> "map" : {
> "PID1": { "PID2": 5 },
> "PID2": { "PID1": 5, "PID3": 20 },
> "PID3": { "PID2": 20 }
> }
> }
> }
>
>
> The motivation is, that for most src/dst-pairs I don't know the costs,
> i.e., all I can say is "try and see what happens". But I know some
> src/dst-pairs where I assume lower costs as well as some pairs where I
> expect higher costs. So I would like being able to express "this should
> be better-than-random" and "this should be worse-than-random". Assuming
> that all omitted entries are 0 or INT_MAX (or FLOAT_MAX) doesn't help.
>
> Comments?
>
> Thanks
> Sebastian
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