>From the draft: === > The mechanism described in this document is considered useful for network > scenarios in which > the required number of NRP is small, as no control protocol extension is > required. For network > scenarios where the number of required NRP is large, more scalable solution > would be needed, > which may require further protocol extensions and enhancements. So the proposed draft is about a solution that doesn't scale (well). And then later, we might get another solution that does scale (better). Then we'll end up with two solutions for one problem. One bad solution, and one (hopefully) better solution. If that is the case, then I suggest we wait a bit, and see what else the TEAS workgroup comes up with. I rather have one good solution than two half-baked. Or even one good and one half-baked. Less is more. henk.
> On 01/11/2024 4:40 AM CET Chongfeng Xie <[email protected]> wrote: > > > > Hi Les, > > Thanks for your comments. > > This is an informational document which describes the applicability of > existing IS-IS MT mechanisms for building SR based NRPs. All the normative > references are either RFCs or stable WG documents. It is true that some > informative references are individual documents, while they just provide > additional information related to this topic, thus would not impact the > stability and maturity of the proposed mechanism. > > The text you quoted from draft-ietf-teas-nrp-scalability are about the > considerations when the number of NRP increases, how to minimize the impact > to the routing protocols (e.g. IGP). While as described in the scalability > considerations section of this document, the benefit and limitation of using > this mechanism for NRP are analyzed, and it also sets the target scenarios of > this mechanism: > > “The mechanism described in this document is considered useful for > network scenarios in which the required number of NRP is small” > > Thus it is clear that this solution is not recommended for network scenarios > where the number of required NRP is large. > > Please note section 3 of draft-ietf-teas-nrp-scalability also mentioned that: > > “The result of this is that different operators can choose to deploy > things at different scales.” > > And > > “In particular, we should be open to the use of approaches that do not > require control plane extensions and that can be applied to deployments with > limited scope.” > > According to the above text, we believe the mechanism described in this > document complies to the design principles discussed in > draft-ietf-teas-nrp-scalability and provides a valid solution for building > NRPs in a limited scope. > > Hope this solves your concerns about the maturity and scalability of this > mechanism. > > Best regards, > > Chongfeng > > > > > > > > From: Les Ginsberg \(ginsberg\) mailto:[email protected] > > Date: 2024-01-11 08:21 > > To: Joel Halpern mailto:[email protected]; Acee Lindem > > mailto:[email protected]; [email protected] mailto:[email protected]; > > [email protected] mailto:[email protected] > > Subject: Re: [Lsr] [Teas] Fwd: Working Group Last Call for "Applicability > > of IS-IS Multi-Topology (MT) for Segment Routing based Network Resource > > Partition (NRP)" - draft-ietf-lsr-isis-sr-vtn-mt-06 > > > > (NOTE: I am replying to Joel’s post rather than the original last call > > email because I share some of Joel’s concerns – though my opinion on the > > merits of the draft is very different. > > Also, I want to be sure the TEAS WG gets to see this email.) > > > > I oppose Last Call for draft-ietf-lsr-isis-sr-vtn-mt. > > > > It is certainly true, as Joel points out, that this draft references many > > drafts which are not yet RFCs – and in some cases are not even WG > > documents. Therefore, it is definitely premature to last call this draft. > > > > I also want to point out that the direction TEAS WG has moved to recommends > > that routing protocols NOT be used as a means of supporting NRP. > > > > https://www.ietf.org/archive/id/draft-ietf-teas-nrp-scalability-03.html#name-scalabliity-design-principl > > states: > > > > “…it is desirable for NRPs to have no more than small impact (zero being > > preferred) on the IGP information that is propagated today, and to not > > required additional SPF computations beyond those that are already > > required.” > > > > https://www.ietf.org/archive/id/draft-ietf-teas-nrp-scalability-03.html#name-scalabliity-design-principl > > states: > > > > “The routing protocols (IGP or BGP) do not need to be involved in any of > > these points, and it is important to isolate them from these aspects in > > order that there is no impact on scaling or stability.” > > > > Another draft which is referenced is > > https://datatracker.ietf.org/doc/draft-dong-lsr-sr-enhanced-vpn/ > > https://datatracker.ietf.org/doc/draft-dong-lsr-sr-enhanced-vpn/ - which is > > not a WG document and – based on the recommendations in > > draft-ietf-teas-nrp-scalability – I would argue that the IGPs should NOT be > > extended as proposed in this draft. So if a WG adoption call were to > > initiated for draft-dong-lsr-sr-enhanced-vpn, I would oppose it. > > > > This then puts draft-ietf-lsr-isis-sr-vtn-mt in the position of publishing > > information about a solution which the IETF is discouraging. I do not know > > why the IETF would want to do this. > > > > If, despite all of the above, at some point it is judged not premature to > > publish this draft, I think the draft should at least include statements > > indicating that this approach is not a recommended deployment solution. > > > > Les > > > > > > From: Lsr <[email protected]> On Behalf Of Joel Halpern > > Sent: Wednesday, January 10, 2024 3:22 PM > > To: Acee Lindem <[email protected]>; [email protected]; [email protected] > > Subject: Re: [Lsr] [Teas] Fwd: Working Group Last Call for "Applicability > > of IS-IS Multi-Topology (MT) for Segment Routing based Network Resource > > Partition (NRP)" - draft-ietf-lsr-isis-sr-vtn-mt-06 > > > > > > Given that the documents that provide the basic definitions needed for this > > are still active Internet Drafts, it seems premature to last call this > > document. > > > > As a lesser matter, it seems odd that draft-ietf-teas-ietf-network-slices, > > which defines the terms needed to understand this draft, is an Informative > > reference. > > > > Yours, > > > > Joel > > > > PS: I considered not writing this email, as it seems quite reasonable to > > use MT to support what I expect NRPs to be. So in principle I think the > > document is a good idea. > > > > On 1/10/2024 6:12 PM, Acee Lindem wrote: > > > > > Note that we are last calling this informational document relating to > > > IS-IS deployment of NRPs using multi-topology. If you have comments, > > > please send them to the LSR list. > > > > > > Thanks, > > > Acee > > > > > > > > > > > > > Begin forwarded message: > > > > > > > > From: Acee Lindem <[email protected]> mailto:[email protected] > > > > Subject: Working Group Last Call for "Applicability of IS-IS > > > > Multi-Topology (MT) for Segment Routing based Network Resource > > > > Partition (NRP)" - draft-ietf-lsr-isis-sr-vtn-mt-06 > > > > Date: January 8, 2024 at 5:50:21 PM EST > > > > To: Lsr <[email protected]> mailto:[email protected] > > > > > > > > This begins a two week LSR Working Group last call for the > > > > “Applicability of IS-IS Multi-Topology (MT) for Segment Routing based > > > > Network Resource Partition (NRP)”. Please express your support or > > > > objection prior to Tuesday, January 23rd, 2024. > > > > > > > > Thanks, > > > > Acee > > > > > > > > > > > > > > > > _______________________________________________ > > > Teas mailing list > > > [email protected] mailto:[email protected] > > > https://www.ietf.org/mailman/listinfo/teas > > > > > > _______________________________________________ > Lsr mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/lsr >
_______________________________________________ Lsr mailing list [email protected] https://www.ietf.org/mailman/listinfo/lsr
