Re: [IPv6] Progress of comments resolution on draft-ietf-6man-enhanced-vpn-vtn-id
Chongfeng Xie <chongfeng.xie@foxmail.com> Thu, 14 December 2023 02:53 UTC
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Date: Thu, 14 Dec 2023 10:53:39 +0800
From: Chongfeng Xie <chongfeng.xie@foxmail.com>
To: adrian <adrian@olddog.co.uk>, "Dongjie (Jimmy)" <jie.dong@huawei.com>
Cc: IPv6 List <ipv6@ietf.org>, "draft-ietf-6man-enhanced-vpn-vtn-id@ietf.org" <draft-ietf-6man-enhanced-vpn-vtn-id@ietf.org>
References: <165d35ecaaa44a3daff0783cd161eb12@huawei.com>, <014c01da2cde$f6e31510$e4a93f30$@olddog.co.uk>, <2fcc89b28bc64c7cb5cf2abf20319006@huawei.com>, <021e01da2d1d$2efc2930$8cf47b90$@olddog.co.uk>
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Subject: Re: [IPv6] Progress of comments resolution on draft-ietf-6man-enhanced-vpn-vtn-id
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Hi Adrian, Thanks for sharing your opinion on this document. I fully agree with your suggestion about the terminology alignment with TEAS according to recent discussion and decision made there on the enhanced VPN framework. Regarding the S flag, I also find it useful for network slicing in our network, as it can help to customize the behavior on traffic belonging to specific NRPs, and also on specific flows in an NRP. It could also be generalized for other use cases. Thus I think it would be more efficient to keep the S flag as part of this document and progress together. Best regards Chongfeng From: Adrian Farrel Date: 2023-12-13 01:03 To: Dongjie (Jimmy) CC: '6man'; draft-ietf-6man-enhanced-vpn-vtn-id@ietf.org Subject: Re: Progress of comments resolution on draft-ietf-6man-enhanced-vpn-vtn-id Hi Jie, I rather expected some more comments on this, and I sat back to watch them, but then it went quiet and I forgot. So, "better late than never". As an aside, I wonder whether you should follow the advice given by TEAS in its work on draft-ietf-teas-enhanced-vpn, and feeding into IDR on draft-dong-idr-sr-policy-nrp. That is, generalise the VTN use case to NRP. I don't think this makes any technical change to the document, but makes the applicability wider (more generic) in step with what TEAS is doing. This seems to in keeping with the suggestions in your Section 5. But it would require some editorial work. I am not enthusiastic about splitting out multiple documents. It just makes more work. While I understand that the authors and Med thought this might be a compromise, I doubt that the authors really want to do this (that is, make more work for themselves) and since no one spoke up on the list, I wonder whether it the (perfectly valid) preference of only one person. If the reason for splitting was technical or made for a radical improvement in readability, I might buy it. But I think it is purely a documentation issue. It is worth noting that if the document was split then, without the S flag, the whole flags field would be unused in the remaining document. It is "unusual" for a spec to define a field that has no documented use. I'd be uncomfortable with that. Conversely, I think this drat should introduce a new registry to track the flags field Personally, I see some value in the S bit as defined. At least, I do in the context of the network slicing use of the NRP. Consider a network where some resources are strictly partitioned (reserved) at some transit nodes, but at other nodes (perhaps ones that are known to have plenty of capacity) no partitioning has been performed. In this case, you would want the nodes that have not done any partitioning to not be bothered by the VTN/NRP ID carried in the packet. But consider, instead, a network that is resource constrained where partitioning has been carefully performed on all nodes. In this case you would want to observe that the packet cannot be assigned to any partition and so should not use the resources of any other partition. Well, I think this might be softened for two reasons: 1. If a node does not understand the HBH option, it will skip over it (you have specified the highest-order 2 bits are set to 00), so the default behaviour is to try to forward the packet. 2. Assigning best-effort forwarding to packets seems like a reasonable default. So, I would keep the S bit in this, but I would change "drop" to "perform best effort forwarding". (Noting, of course, that the best you can do might still be to drop the packet.) Cheers, Adrian > From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Dongjie (Jimmy) > Sent: Wednesday, November 8, 2023 12:59 AM > To: 6man <mailto:ipv6@ietf.org> > Cc: draft-ietf-6man-enhanced-vpn-vtn-id@ietf.org > Subject: [IPv6] Progress of comments resolution on draft-ietf-6man-enhanced-vpn-vtn-id > > Hi WG, > > Regarding Med's review comments on draft-ietf-6man-enhanced-vpn-vtn-id, the authors > and Med met in Prague and reach some agreement about the possible resolution of his > comments. > > The proposed approach is to split the definition of the S flag out from this document, so > that this document will focus on the specification of the VTN option with all the flags as > reserved, and the S Flag could be defined as an extension to the VTN option in a separate > document. > > Before updating this WG draft, we would like to know the WG's opinion on this approach > to move forward. Any feedback is welcome.
- [IPv6] Progress of comments resolution on draft-i… Dongjie (Jimmy)
- Re: [IPv6] Progress of comments resolution on dra… Adrian Farrel
- Re: [IPv6] Progress of comments resolution on dra… Chongfeng Xie
- Re: [IPv6] Progress of comments resolution on dra… Dongjie (Jimmy)
- Re: [IPv6] Progress of comments resolution on dra… mohamed.boucadair
- Re: [IPv6] Progress of comments resolution on dra… Dongjie (Jimmy)
- Re: [IPv6] Progress of comments resolution on dra… Ketan Talaulikar
- Re: [IPv6] Progress of comments resolution on dra… Ketan Talaulikar
- Re: [IPv6] Progress of comments resolution on dra… Dongjie (Jimmy)
- Re: [IPv6] Progress of comments resolution on dra… mohamed.boucadair
- Re: [IPv6] Progress of comments resolution on dra… Dongjie (Jimmy)
- Re: [IPv6] Progress of comments resolution on dra… Adrian Farrel
- Re: [IPv6] Progress of comments resolution on dra… Gyan Mishra
- Re: [IPv6] Progress of comments resolution on dra… Dongjie (Jimmy)
- Re: [IPv6] Progress of comments resolution on dra… Gyan Mishra
- Re: [IPv6] Progress of comments resolution on dra… mohamed.boucadair
- Re: [IPv6] Progress of comments resolution on dra… Dongjie (Jimmy)
- Re: [IPv6] Progress of comments resolution on dra… mohamed.boucadair
- Re: [IPv6] Progress of comments resolution on dra… Dongjie (Jimmy)