Re: [mpls] MPLS-RT experts review for draft-gandhi-mpls-rfc6374-sr
Greg Mirsky <gregimirsky@gmail.com> Sat, 13 June 2020 02:07 UTC
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Fri, 12 Jun 2020 19:06:20 -0700
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To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Tarek Saad <tsaad.net@gmail.com>, "mpls@ietf.org" <mpls@ietf.org>, "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-gandhi-mpls-rfc6374-sr@ietf.org" <draft-gandhi-mpls-rfc6374-sr@ietf.org>
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Subject: Re: [mpls] MPLS-RT experts review for draft-gandhi-mpls-rfc6374-sr
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Hi Huaimo, thank you for your comments. Though I am not a co-author of the draft, I am very interested in the topic. I have a question related to your comments and conclusions below: - you've noted "It seems that the Performance Measurement for a SR P2MP Path (or policy) is limited to one way and out-of-band. Should the document add some texts talking about these limitations?" If that truly is the case, i.e., the proposed OAM mechanism can only work as out-of-band, what is the value of the measurement results using the synthetic method of measurement? If, as you have noted, a test packet does not follow the monitored data flow, how trustworthy and useful the loss and delay measurement are achieved? I think that I cannot agree with your conclusion that the prosed PM OAM mechanism can only work as out-of-band tool, i.e., support direct measurement statistics by collecting counters. The fact that a test packet, as described in the draft, uses the precisely same policies as a data packet, in my view, ensures that it is in-band and shares the fate with the data flow, which is essential to obtaining useful performance measurements. I much appreciate your consideration of my question. Regards, Greg On Mon, Jun 8, 2020 at 8:52 PM Huaimo Chen <huaimo.chen@futurewei.com> wrote: > Hi All, > > I have reviewed the document and have the following comments. > > 1. The document is useful and technically sound. It can be considered > for WG adoption. > > 2. The document seems talking about the Loss Measurement Message > and Delay Measurement Message. Should it have some texts for Combined > Loss/Delay Measurement Message? > > 3. There are a couple of IETF drafts about SR P2MP Path.. The > document just mentions one of them and the Performance Measurement for a SR > P2MP Path (or policy) is based on this one draft. Should the Performance > Measurement for a SR P2MP Path (or policy) be general enough for all? > > 4. It seems that the Performance Measurement for a SR P2MP Path (or > policy) is limited to one way and out-of-band. Should the document add some > texts talking about these limitations? > > 5. The registry for the newly defined Return Path TLV Type and Block > Number TLV Type is missing in the document. Is it the "MPLS Loss/Delay > Measurement TLV Object" registry? > > 6. It seems that a new registry should be defined for the Sub-TLV > types under the Return Path TLV in the document. > > 7. In section 5.1. and section 6.1., Should "For both SR Links and > end-to-end measurement for SR-MPLS Policies" be changed to something like > "For both SR Links and end-to-end SR-MPLS Policies measurements"? > > 8. In section 6.2., should something like a user case be added into > the sentence "The Block Number TLV is Mandatory when used.."? > > > Best Regards, > Huaimo > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://www.ietf.org/mailman/listinfo/mpls >
- Re: [mpls] MPLS-RT experts review for draft-gandh… Greg Mirsky
- Re: [mpls] MPLS-RT experts review for draft-gandh… Huaimo Chen
- Re: [mpls] MPLS-RT experts review for draft-gandh… Huaimo Chen
- Re: [mpls] MPLS-RT experts review for draft-gandh… Huaimo Chen
- Re: [mpls] MPLS-RT experts review for draft-gandh… Rakesh Gandhi
- Re: [mpls] MPLS-RT experts review for draft-gandh… Rakesh Gandhi
- Re: [mpls] MPLS-RT experts review for draft-gandh… Greg Mirsky
- Re: [mpls] MPLS-RT experts review for draft-gandh… Yimin Shen
- Re: [mpls] MPLS-RT experts review for draft-gandh… Rakesh Gandhi