[lisp] Re: Review draft-ietf-lisp-te
Luigi Iannone <ggx@gigix.net> Mon, 27 May 2024 13:19 UTC
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From: Luigi Iannone <ggx@gigix.net>
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Date: Mon, 27 May 2024 15:18:56 +0200
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To: Dino Farinacci <farinacci@gmail.com>
References: <261E2219-4B13-43EE-AF78-C470826C28DF@gigix.net> <5069882E-D7F8-48D5-86FC-2BA095A95D55@gmail.com> <3CD7999A-2BBC-4C21-9D7F-AE4256466140@gigix.net>
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Subject: [lisp] Re: Review draft-ietf-lisp-te
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Hi Dino, I do not see a reply to my last email. Can you fix the figure of the example so that we can move forward? The concerned part is: >> >>> This is exactly the point. I do not see an alternate path. I see only an alternate tunnel. >>> The current text is still confusing. You want "to route around the path from B to C” and to do it you route "through link B—>C”. This looks like a contradiction to me. >> >> B and C have other links. Don’t you see the link between B and X. That is “another” path. > > But the figure has no “other path” in it. I added one in my first review but you did not like it. > > The text: > > if it is desirable to route around the path from B to C through link B-->C, > > Still look like a contradiction. Furthermore, in figure 1 you were already routing through link B—>C, so it looks like you “route around” through the very same link….. > > For clarity, according to the convention you are using the figure 2 show a tunnel between X and Y but not a path. I put back my very first email with the suggested correct figure. Source site (----------------------------) Destination Site +--------+ ( ) +---------+ | \ ( ) / | | seid ITR ---(-> A -> B --------> C -> D -)---> ETR deid | | / || ( | ^ ) ^^ \ | | / || ( | | ) || \ | +-------+ || ( v | ) || +--------+ || ( X --------> Y ) || || ( ^^ || ^^ || ) || <> || (------||-||-------||-||-----) || || || || || || || || ||=======|| || || =============== LISP =============== LISP Tunnel Tunnel LISP Tunnel Ciao L. > On 13 May 2024, at 13:58, Luigi Iannone <ggx@gigix.net> wrote: > > > >> On 7 May 2024, at 16:36, Dino Farinacci <farinacci@gmail.com> wrote: >> >> >>> The text still assumes that an ELP must be returned. >> >> That is correct. >> >>> >>> Just replace the words: >>> >>> “which returns a ELP-based locator record for a path to RTR 'y', and encapsulates packets…" >> >> The example is illustrating nesting so I believe it is not needed. > > I understand the example, but the text is a bit misleading because seems to suggest that lookup _must_ return an ELP. > Anyway, in the last revision is already better. > > >> >>>>>> Luigi, the terms are used in self contained sections. They are fine. S-EID is ONLY used in the multicast section because the is the convention we use to look up a multicast mapping (S-EID, G-EID). >>> >>> I think a unique term makes more sense, but this is not a blocking point. >> >> It is a unique term. The term S-EID is used in all the multicast drafts to describe an (S,G). > > Fine. > >> >>> This is exactly the point. I do not see an alternate path. I see only an alternate tunnel. >>> The current text is still confusing. You want "to route around the path from B to C” and to do it you route "through link B—>C”. This looks like a contradiction to me. >> >> B and C have other links. Don’t you see the link between B and X. That is “another” path. > > But the figure has no “other path” in it. I added one in my first review but you did not like it. > > The text: > > if it is desirable to route around the path from B to C through link B-->C, > > Still look like a contradiction. Furthermore, in figure 1 you were already routing through link B—>C, so it looks like you “route around” through the very same link….. > > > >> >>> The sentence remains superfluous. Of course you can do it with ODL, but this is out of the scope of the IETF and I do not see why it should be there. >>> The other LISP documents never mention a provision system, so why this one has to mention it? Is there a compelling reason? >> >> Because in other cases ETRs register their own RLOCs because they know them. With an ELP, a provisioning system knows the topology and can register all the addresses in the ELP. It has a broader view. >> >> There are deployments that take an ISIS topology, compute paths offline as an SDN controller, and can build an ELP path based on policy rules (where re-encapsulation points can be placed in the network). >> > > The sentence is still superfluous. The fact that some LISP deployments use some SDN approach has no place in the document. This is a technical document for implementation of a feature, not a LISP advertisement. > You can leave the sentence there if you really wish, but remains superfluous. > > > Fix the example and we tackle the text. > > Ciao > > L. > > >> Dino >
- [lisp] Re: Review draft-ietf-lisp-te Padma Pillay-Esnault
- Re: [lisp] Review draft-ietf-lisp-te Dino Farinacci
- [lisp] Review draft-ietf-lisp-te Luigi Iannone
- Re: [lisp] Review draft-ietf-lisp-te Dino Farinacci
- Re: [lisp] Review draft-ietf-lisp-te Luigi Iannone
- Re: [lisp] Review draft-ietf-lisp-te Luigi Iannone
- Re: [lisp] Review draft-ietf-lisp-te Luigi Iannone
- [lisp] Re: Review draft-ietf-lisp-te Dino Farinacci
- [lisp] Re: Review draft-ietf-lisp-te Luigi Iannone
- [lisp] Re: Review draft-ietf-lisp-te Dino Farinacci
- [lisp] Re: Review draft-ietf-lisp-te Luigi Iannone
- [lisp] Re: Review draft-ietf-lisp-te Padma Pillay-Esnault
- [lisp] Re: Review draft-ietf-lisp-te Luigi Iannone
- [lisp] Re: Review draft-ietf-lisp-te Luigi Iannone
- [lisp] Re: Review draft-ietf-lisp-te Dino Farinacci
- [lisp] Re: Review draft-ietf-lisp-te Joel Halpern
- [lisp] Re: Review draft-ietf-lisp-te Padma Pillay-Esnault
- [lisp] Re: Review draft-ietf-lisp-te Dino Farinacci
- [lisp] Re: Review draft-ietf-lisp-te Padma Pillay-Esnault
- [lisp] Re: Review draft-ietf-lisp-te Padma Pillay-Esnault
- [lisp] Re: Review draft-ietf-lisp-te Dino Farinacci
- [lisp] Re: Review draft-ietf-lisp-te Padma Pillay-Esnault
- [lisp] Re: Review draft-ietf-lisp-te Dino Farinacci
- [lisp] Re: Review draft-ietf-lisp-te Dino Farinacci
- [lisp] Re: Review draft-ietf-lisp-te Dino Farinacci
- [lisp] Re: Review draft-ietf-lisp-te Dino Farinacci