Re: [Teas] Several questions draft-ietf-teas-actn-pm-telemetry-autonomics
Greg Mirsky <gregimirsky@gmail.com> Tue, 07 September 2021 20:42 UTC
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Tue, 07 Sep 2021 13:42:37 -0700
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To: Dhruv Dhody <dhruv.dhody@huawei.com>
Cc: "draft-ietf-teas-actn-pm-telemetry-autonomics@ietf.org" <draft-ietf-teas-actn-pm-telemetry-autonomics@ietf.org>, TEAS WG <teas@ietf.org>, Dhruv Dhody <dhruv.ietf@gmail.com>
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Subject: Re: [Teas] Several questions draft-ietf-teas-actn-pm-telemetry-autonomics
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Hi Dhruv, many thanks for your kind and thoughtful consideration of my notes. Please find more in-lined below under the GIM>> tag. Regards, Greg On Thu, Sep 2, 2021 at 12:46 AM Dhruv Dhody <dhruv.dhody@huawei.com> wrote: > *Hi Greg, * > > *Thanks for your support! More inline…. * > > > > *From:* Teas [mailto:teas-bounces@ietf.org] *On Behalf Of *Greg Mirsky > *Sent:* 29 August 2021 02:15 > *To:* draft-ietf-teas-actn-pm-telemetry-autonomics@ietf.org; TEAS WG < > teas@ietf.org> > *Subject:* [Teas] Several questions > draft-ietf-teas-actn-pm-telemetry-autonomics > > > > Dear Authors, > > thank you for writing this document, developing these data models. I > wholeheartedly agree with you that up-to-date telemetry information is > essential in closing the control circuit ensuring autonomous self-healing > networking. I've read the document and have several questions; much > appreciate your help in clarifying them: > > - in listing the benefits of performance monitoring, as it interpreted > in the draft, you've mentioned "proactive re-optimization". As I understand > it, telemetry information reflects network conditions that already happen > and by the time a subscriber to performance monitoring notifications > receives the next update, it is probably closer to near-real-time process. > If then an application triggers corrective actions, e.g., scaling out, how > that is proactive? I imagine that to trigger scaling out, a particular > parameter or a group of parameters had crossed the predefined threshold and > the state has been stable for threshold-time. Hence, the system is > reactive, not proactive. > > *[[DD]] That is a good observation. But since the threshold could be set > to value much before the real disaster, I considered that to still mean > proactive in that sense that we are re-optimizing before the Tunnel/VN has > gone down. I can add some text to explain why we consider this proactive. > Or avoid using the word.* > GIM>> I think that if we avoid the discussion of what behavior is proactive or reactive, that will not damage the value of the document. What do you think? > > - you've included a number of performance parameters in data models. I > couldn't find a discussion of the selection process. i.e., why these > parameters were selected, and why others are not included? I hope you can > point me to where I can find that discussion. > > *[[DD]] We have included the grouping from RFC 8776 > (te-types:performance-metrics-attributes) and thus considered that to be > settled matter for now. * > GIM>> Thank you for pointing that out to me, I've missed that. I agree, that settles it. > > - how do you see your work in relation to > draft-ietf-opsawg-yang-vpn-service-pm > <https://datatracker.ietf.org/doc/draft-ietf-opsawg-yang-vpn-service-pm/>? > Some of the performance metrics reported through > the draft-ietf-opsawg-yang-vpn-service-pm are part of the STAMP YANG > data model > <https://datatracker.ietf.org/doc/draft-ietf-ippm-stamp-yang/>. > > *[[DD]] It is a good idea to add a sentence on this in the draft. I do > consider these two models to be independent but could be used together to > understand the performance issues at the VPN service and the underlying TE.* > GIM>> Thank you for your consideration. References certainly will be useful to a reader. > *Thanks! * > > *Dhruv* > > > > Regards, > > Greg >
- [Teas] Several questions draft-ietf-teas-actn-pm-… Greg Mirsky
- Re: [Teas] Several questions draft-ietf-teas-actn… Dhruv Dhody
- Re: [Teas] Several questions draft-ietf-teas-actn… Greg Mirsky