Re: [alto] PCE

Hi Martin,

I agree with Luis. RFC 7971 list PCE as a potential data source for ALTO
server - https://datatracker.ietf.org/doc/html/rfc7971#autoid-19
Further RFC 7491 attempts to capture some of the possible PCE and ALTO
interactions where PCE and ALTO complement each other.

Thanks!
Dhruv

On Tue, Nov 28, 2023 at 2:00 AM LUIS MIGUEL CONTRERAS MURILLO <
luismiguel.contrerasmurillo@telefonica.com> wrote:

> Hi Martin
>
>
>
> Thanks for commenting.
>
>
>
> PCE and ALTO work on different aspects. PCE allows to calculate and/or
> select the best path among network border elements according to some
> constraints (e.g., latency). Besides that, the PCE can trigger the
> establishment of such path leveraging on tunneling capabilities, e.g. using
> Segment Routing with Traffic Engineering.
>
>
>
> On the other hand, as you know well, with ALTO it is possible to expose
> network and cost maps for PIDs attached to network border elements.
>
>
>
> So, while PCE intention is to build constrained paths, ALTO aim is to
> expose them. Certainly, ALTO could leverage on PCE information for creating
> the network and cost maps (case not yet elaborated in the form of an RFC or
> draft, that is, definition of an SBI for retrieving PCE information
> extracting info from PCE-related databases), but also other forms of
> interworking could be considered (e.g., ALTO triggering PCE computation of
> paths). These potential interworking actions could be a matter of a charter
> item for SBI developments in ALTO WG (or a sequel of it).
>
>
>
> Best regards
>
>
>
> Luis
>
>
>
> *De:* alto <alto-bounces@ietf.org> *En nombre de * Martin Duke
> *Enviado el:* lunes, 27 de noviembre de 2023 20:00
> *Para:* IETF ALTO <alto@ietf.org>
> *Asunto:* [alto] PCE
>
>
>
> Hi ALTO,
>
>
>
> In my email announcing the impending closure of ALTO, I mentioned a number
> of potential outlets for future work. I neglected to mention PCE
> <https://datatracker.ietf.org/wg/pce/about/>, which to me seems to
> covering a similar problem area. If they haven't already, I would encourage
> ALTO practitioners to investigate PCE's activities and see where ALTO
> solves their problems, or PCE work solves current ALTO problems.
>
>
>
> Similarly, people working on PCE probably have issues with assembling a
> topology database, and would probably be fruitful partners for those
> working on assembling the ALTO database.
>
>
>
> Thanks,
>
> Martin
>
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