[Nsi-wg] Pathfinding and Service (a new topology suggestion)

[John MacAuley]

Henrik,

I was talking with Chin about the following example and his understanding was different than mine.  I think I have it wrong but wanted to check.

For the link "urn:ogf:network:aruba:bonaire-otn" my understanding was from Bonaire I could use EVTS to reach Curacao with a cost of 2, and I could use OTN to reach Bonaire (back to me) with a cost of 1.

Chin indicated that the type of service used on the link "urn:ogf:network:aruba:bonaire-otn" is not described as it is know between the two ends of the link (implicit), and what the entries indicate is you can reach Curacao with EVTS through Aruba at a cost of 2.  So if the implicit service on link "urn:ogf:network:aruba:bonaire-otn" is OTN, then adaptation will occur somewhere to get you to the "EVTS" service in Curacao.

So in Chin's explanation a single service type is on the link "urn:ogf:network:aruba:bonaire-otn" and the service adaptations are described.  In mine the services on the link are described but adaptation is not.

Could you please clarify?

Thanks,
John

On 2015-02-05, at 9:59 AM, Henrik Thostrup Jensen <htj at nordu.net> wrote:

> <Network id="urn:ogf:network:aruba" version="123">
>    <Name>Aruba</Name>
>    <Link id="urn:ogf:network:aruba:bonaire-otn" demarcation="urn:ogf:network:bonaire:aruba-otn">
>        <Name>Bonaire OTN Link</Name>
>        <Service type="EVTS">
>            <ReachableNetwork id="urn:ogf:network:bonaire" distance="1" />
>            <ReachableNetwork id="urn:ogf:network:curacao" distance="2" />
>        </Service>
>        <Service type="OTN">
>            <ReachableNetwork id="urn:ogf:network:bonaire" distance="1" />
>        </Service>
>    </Link>
>    <Link id="urn:ogf:network:aruba:dominica-eth" demarcation="urn:ogf:network:dominica:aruba-eth">
>        <Name>Dominica Ethernet Link</Name>
>        <ServiceTransit type="EVTS" />
>    </Link>
>    <Service type="SwitchingService" />
> </Network>

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