Re: [sfc] Call for WG adoption of draft-penno-sfc-appid-03
Kengo NAITO <k.naito@nttv6.jp> Tue, 12 July 2016 04:10 UTC
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From: Kengo NAITO <k.naito@nttv6.jp>
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Date: Tue, 12 Jul 2016 13:10:28 +0900
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Cc: "draft-penno-sfc-appid@ietf.org" <draft-penno-sfc-appid@ietf.org>, "Jim Guichard (jguichar)" <jguichar@cisco.com>
Subject: Re: [sfc] Call for WG adoption of draft-penno-sfc-appid-03
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I have sent comments below to authors. I would also like to post to the ML. comments: 1. Why not allow other alternatives? The document, from the introduction part, says too much that you focus on IPFIX. Using IPFIX application ID format is one most valuable way to describe application, however, focusing too much on IPFIX may sometime mislead people. So why not, - first write, "This is a draft to discuss using application identification as a context" - and then write, "There are many alternatives, such as json and other formats to describe application identification" - finally, "the format of IPFIX application ID is one best practice of the metadata format". 2. Concrete use case or "purpose" is needed This is needed to mention what WG want to solve, or what WG want NSH to do. I as a carrier engineer have a justification to carry application identification. There are three points: -L7 identification is now useful in many ways. Visualization of traffic, or co-operation with other functions. - The cost of application identification(say, DPI) is quite high.(traffic handling, and also the cost of DPI equipments) -There are many data centers to place SFs, and chain them. We cannot DPI in every data centers for re-classification or SFForwarding. If we can carry and re-use(or share) app-id information across DCs, it would make good cost reduction. I think that NSH is the best practice to do such things. (Also, use case of traversing several data centers is written in draft-ietf-sfc-dc-use-cases, which is a WG doucment.) 3. Consideration of MD-Type is needed I think that consideration is needed before you say "we use MD-Type1". There may be some case that MD-Type1 is helpful to convey application identification. Good example is as is written in current draft. On the other hand, MD-Type2 may be needed, when the identification format do not fit to 4byte x4 context headers. For example, giving application name as a string or long bit json as a metadata, in result of DPI or other functions. Please let me hear your opinion. Best regards, Kengo On 2016/05/04 1:59, Joel M. Halpern wrote: > I read this document. > The problem / task is clearly useful, so I support having the WG adopt a > document to address it. > The proposed information structure seems a good start, so I support > adoption of this document. > > I think it would be helped by a little bit of text explaining how this > would appear, with what length, in an MD-2 TLV, and what happens if the > inner implicit length and the outer explicit length don't match. > > What is unclear to me is: what is the purpose of the YANG model? > I have no problem with having separate documents defining additional > TLVs. We are clearly going to need them. > But defining a YANG model for each TLV seems really strange. > > Yours, > Joel > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc -- ------------------------------------------------ Kengo NAITO Technology Development NTT Communications Corporation Tel: +81-50-3813-6053 E-mail: k.naito@nttv6.jp ------------------------------------------------
- Re: [sfc] Call for WG adoption of draft-penno-sfc… Carlos Pignataro (cpignata)
- [sfc] Call for WG adoption of draft-penno-sfc-app… Jim Guichard (jguichar)
- [sfc] Call for WG adoption of draft-penno-sfc-app… Jim Guichard (jguichar)
- Re: [sfc] Call for WG adoption of draft-penno-sfc… Nagendra Kumar Nainar (naikumar)
- Re: [sfc] Call for WG adoption of draft-penno-sfc… mohamed.boucadair
- [sfc] Reuse the IPFIX registry in NSH Carlos Pignataro (cpignata)
- Re: [sfc] Call for WG adoption of draft-penno-sfc… Carlos Pignataro (cpignata)
- Re: [sfc] Reuse the IPFIX registry in NSH mohamed.boucadair
- Re: [sfc] Call for WG adoption of draft-penno-sfc… mohamed.boucadair
- Re: [sfc] Reuse the IPFIX registry in NSH Carlos Pignataro (cpignata)
- Re: [sfc] Reuse the IPFIX registry in NSH mohamed.boucadair
- Re: [sfc] Call for WG adoption of draft-penno-sfc… Carlos Pignataro (cpignata)
- Re: [sfc] Reuse the IPFIX registry in NSH Carlos Pignataro (cpignata)
- Re: [sfc] Reuse the IPFIX registry in NSH Joel M. Halpern
- Re: [sfc] Call for WG adoption of draft-penno-sfc… mohamed.boucadair
- Re: [sfc] Reuse the IPFIX registry in NSH Stewart Bryant
- Re: [sfc] Call for WG adoption of draft-penno-sfc… Carlos Pignataro (cpignata)
- Re: [sfc] Call for WG adoption of draft-penno-sfc… Joel M. Halpern
- Re: [sfc] Call for WG adoption of draft-penno-sfc… Linda Dunbar
- Re: [sfc] Call for WG adoption of draft-penno-sfc… Kengo NAITO