[Teas] Final open issue with draft-ietf-teas-te-service-mapping-yang
Adrian Farrel <adrian@olddog.co.uk> Wed, 15 September 2021 10:03 UTC
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From: Adrian Farrel <adrian@olddog.co.uk>
To: 'TEAS WG' <teas@ietf.org>
Cc: draft-ietf-teas-te-service-mapping-yang@ietf.org
Date: Wed, 15 Sep 2021 11:03:14 +0100
Organization: Old Dog Consulting
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Subject: [Teas] Final open issue with draft-ietf-teas-te-service-mapping-yang
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Hi, Appendix B shows two open issues. I think a previous thread disposed of the second one: calendaring. I didn't see any disagreement, and saw some support for my proposal. The first issue in appendix B is about how to indicate what traffic should be mapped to a specific path. I think this is a fundamental usage requirement, but I have some observations. 1. We have had the concept of TE LSPs for a few years, yet somehow we have survived without a standardised way of stating what traffic the LSPs should carry. Even the MIBs for MPLS-TE did not discuss this. That, of itself, is not a good reason not to specify a description of traffic-to-path mapping, but it may be an indication that there is less urgency. 2. A similar question occurred to the PCE working group: when a PCE tells a PCC what LSP to set up, how does the PCC know what traffic to put on the LSP? This led to draft-ietf-pce-pcep-flowspec which is in the RFC Editor Queue. That document includes a way to describe traffic flows in PCEP. 3. The question also arises in the context of SFC. Here, traffic needs to be "classified" onto a service function chain/path so that it receives the correct treatment in the network. 4. From a YANG perspective, the question could be made very generic. "How does the management station notify a network node how to classify traffic and what to do with it?" The principle of generalisation has run through a lot of the work in TEAS. The intention has, I think, been to look for wide applicability for our work rather than restricting it to niche uses. I think we would do well to consider that principle in this case to. That is, we should consider working on a YANG model that describes traffic and indicates what should be done with it. - For the description of traffic, I think we can learn a lot from the IDR and PCE working groups, but also from RFC 8519 which provides a YANG model for ACL. - For the associated "action" I suspect that we only need to "point" to a YANG object (such as an LSP, or path, or SFC, or ...) So my proposal is that those interested in this question should start work on a separate model, and that this issue should also be removed from appendix B. Perhaps a few words would need to be added to the document to indicate that this problem has to be solved "by local configuration or through a YANG model developed in the future." At that point, I wonder whether there is anything else that needs to be done with this document. Cheers, Adrian
- [Teas] Final open issue with draft-ietf-teas-te-s… Adrian Farrel