Re: [Lsr] New Version Notification for draft-bonica-lsr-ip-flexalgo-00.txt

[[e-mail]]

Ron, all,

>From a use case standpoint, I have a use case for having both SR-MPLS and IP flexalgo in the same network.

>From a protocol standpoint, I think that the functionality could be equally met by advertising SR-MPLS SID as per RFC 8667 but using a label 3 (implicit null) to instruct the LER/LSR to not use a label in the forwarding plane. (while still advertising a label in the control plane because we have to).
I feel that this would be less change in the protocol (no new tlv), a good fit for network requiring both MPLS and IP flex algo, and would not require implementations/network operator to duplicate the "prefix sub-TLV" [1] on both advertisements (IP based and SR-MPLS based).

That would still requires a protocol extension/STD track RFC as RFC 8667 does not allow for this. That would still require change to implementations as only the signalling is different while the feature/behavior is the same (i.e. no magic).

Regards,
--Bruno

[1] aka "Sub-TLVs for TLVs 135, 235, 236, and 237 (Extended IP reachability, MT IP. Reach, IPv6 IP. Reach, and MT IPv6 IP. Reach TLVs)"


> -----Original Message-----
> From: Lsr [mailto:[e-mail]] On Behalf Of Ron Bonica
> Sent: Tuesday, September 29, 2020 3:38 PM
> To: [e-mail]
> Subject: [Lsr] FW: New Version Notification for draft-bonica-lsr-ip-flexalgo-
> 00.txt
> 
> 
> Please review and comment
> 
>                                        Ron
> 
> 
> 
> Juniper Business Use Only
> 
> > -----Original Message-----
> > From: [e-mail] <[e-mail]>
> > Sent: Tuesday, September 29, 2020 9:36 AM
> > To: Parag Kaneriya <[e-mail]>; Shraddha Hegde
> > <[e-mail]>; Ron Bonica <[e-mail]>; Rajesh M
> > <[e-mail]>; William Britto A J <[e-mail]>
> > Subject: New Version Notification for draft-bonica-lsr-ip-flexalgo-00.txt
> >
> > [External Email. Be cautious of content]
> >
> >
> > A new version of I-D, draft-bonica-lsr-ip-flexalgo-00.txt
> > has been successfully submitted by Ron Bonica and posted to the IETF
> > repository.
> >
> > Name:           draft-bonica-lsr-ip-flexalgo
> > Revision:       00
> > Title:          IGP Flexible Algorithms (Flexalgo) In IP Networks
> > Document date:  2020-09-29
> > Group:          Individual Submission
> > Pages:          14
> > URL:            https://urldefense.com/v3/__https://www.ietf.org/id/draft-
> bonica-
> > lsr-ip-flexalgo-00.txt__;!!NEt6yMaO-gk!X7PVDP-
> > FnUA0oCcZMw3Qde6in0C72hu_9hOZ53kPspIarR8fNDyU9Vck80Zbjoij$
> > Status:
> > https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-
> bonica-lsr-
> > ip-flexalgo/__;!!NEt6yMaO-gk!X7PVDP-
> > FnUA0oCcZMw3Qde6in0C72hu_9hOZ53kPspIarR8fNDyU9Vck8x7e5ZqI$
> > Htmlized:
> > https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-
> > bonica-lsr-ip-flexalgo__;!!NEt6yMaO-gk!X7PVDP-
> > FnUA0oCcZMw3Qde6in0C72hu_9hOZ53kPspIarR8fNDyU9Vck82w_6CyU$
> > Htmlized:
> https://urldefense.com/v3/__https://tools.ietf.org/html/draft-
> > bonica-lsr-ip-flexalgo-00__;!!NEt6yMaO-gk!X7PVDP-
> > FnUA0oCcZMw3Qde6in0C72hu_9hOZ53kPspIarR8fNDyU9Vck81_QrJ_p$
> >
> >
> > Abstract:
> >    An IGP Flexible Algorithm computes a constraint-based path and maps
> >    that path to an identifier.  As currently defined, Flexalgo can only
> >    map the paths that it computes to Segment Routing (SR) identifiers.
> >    Therefore, Flexalgo cannot be deployed in the absence of SR.
> >
> >    This document extends Flexalgo, so that it can map the paths that it
> >    computes to IP addresses.  This allows Flexalgo to be deployed in any
> >    IP network, even in the absence of SR.
> >
> >
> >
> >
> > Please note that it may take a couple of minutes from the time of
> submission
> > until the htmlized version and diff are available at tools.ietf.org.
> >
> > The IETF Secretariat
> >
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