Hi Marcel, PSF, Speaking as a WG participant...
Note that we do have a metric type "T=20: Domain Count metric (number of domains crossed)."; we can simply use this metric type, asking the PCE to optimize based on this which should lead to preferring intra-domain paths. See https://www.rfc-editor.org/rfc/rfc8685.html#section-3.5 Thanks! Dhruv On Tue, Sep 19, 2023 at 9:04 AM <peng.sha...@zte.com.cn> wrote: > > Hi Marcel, > > > May it be a local policy of PCE ? > > For a given <ingress PE, egress PE> that belongs to the same domain, it > may be > > the default policy for PCE to calculate a candidate path intra domain. > > Otherwise, it may bring unnecessary complexity. For example, for a real > inter-domain > > path requirement of <ingress PE, egress PE> that belongs to the different > domain, > > the intention is to split the path calculation requirements into multiple > domains, e.g, > > <ingress PE, ABR1> for domain 1, <ABR1, ABR2> for domain 2, etc. Now, in > this case, > > does <ingress PE, ABR1> itself again get a inter-domain path ? In theory, > yes. But in > > reality, it doesn't make sense. > > > Regards, > > PSF > > > Original > *From: *MarcelReuter(External) <marcel.reuter.exter...@telefonica.com> > *To: *pce@ietf.org <pce@ietf.org>; > *Date: *2023年09月15日 16:25 > *Subject: **[Pce] [PCE]: Draft-ietf-pce-sid-algo: Prefer Intra vs > Inter-domain* > _______________________________________________ > Pce mailing list > Pce@ietf.org > https://www.ietf.org/mailman/listinfo/pce > > Aloha, > > Dear colleagues, > > > > I have a question regarding the PCE with SR Flex-algo and multiple IGP > domains. > > > > In my understanding in each IGP Domain the Flex-Algo is calculated > independently of each other domain. > > The PCE should have the view of all IGP domains, including IGP metrics and > delay metrics. > > > > So if the PCE calculate a path and ingress and egress PE are in the same > IGP domain, > > It would be preferable to choose an IGP intra domain vs using another IGP > as transit. > > Or at least have the possibility to choose or prefer an Intra-Domain path > (with a flag maybe?) > > > > Reason: > > Especially in mobile operator RAN networks, there could be bandwidth > limitations in RAN IGP domains, but still a lower delay path. > > > > What’s your opinion about this? > > > > Thanks > > Marcel > > > > > > > > > > > > > > ------------------------------ > > Este mensaje y sus adjuntos se dirigen exclusivamente a su destinatario, > puede contener información privilegiada o confidencial y es para uso > exclusivo de la persona o entidad de destino. Si no es usted. el > destinatario indicado, queda notificado de que la lectura, utilización, > divulgación y/o copia sin autorización puede estar prohibida en virtud de > la legislación vigente. Si ha recibido este mensaje por error, le rogamos > que nos lo comunique inmediatamente por esta misma vía y proceda a su > destrucción. > > The information contained in this transmission is confidential and > privileged information intended only for the use of the individual or > entity named above. If the reader of this message is not the intended > recipient, you are hereby notified that any dissemination, distribution or > copying of this communication is strictly prohibited. If you have received > this transmission in error, do not read it. Please immediately reply to the > sender that you have received this communication in error and then delete > it. > > Esta mensagem e seus anexos se dirigem exclusivamente ao seu destinatário, > pode conter informação privilegiada ou confidencial e é para uso exclusivo > da pessoa ou entidade de destino. Se não é vossa senhoria o destinatário > indicado, fica notificado de que a leitura, utilização, divulgação e/ou > cópia sem autorização pode estar proibida em virtude da legislação vigente. > Se recebeu esta mensagem por erro, rogamos-lhe que nos o comunique > imediatamente por esta mesma via e proceda a sua destruição > > > _______________________________________________ > Pce mailing list > Pce@ietf.org > https://www.ietf.org/mailman/listinfo/pce >
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