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
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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
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