Hi Haoyu, thank you for your detailed reply. Please find my follow-up notes in-lined below under the GIM2>> tag.
Regards, Greg On Thu, Jan 27, 2022 at 11:00 AM Haoyu Song <[email protected]> wrote: > Hi Greg, > > > > Thank you for your questions. Please see inline response. > > > > Best, > > Haoyu > > > > *From:* Greg Mirsky <[email protected]> > *Sent:* Wednesday, January 26, 2022 3:01 PM > *To:* Haoyu Song <[email protected]> > *Cc:* [email protected]; IETF IPPM WG <[email protected]> > *Subject:* Re: [spring] Active OAM in SRv6 > > > > Hi Haoyu, > > thank you for bringing the topic of Active OAM to the discussion. As the > concept of Active IOAM is introduced in the IPPM WG draft > <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-ippm-ioam-flags&data=04%7C01%7Chaoyu.song%40futurewei.com%7Cc347a296576a4bcc02dc08d9e11fcba3%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637788348960663433%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=ICDx4pdmgXJBs68SATcvkTpZSOTZ6LD7JyCCKYM6IJg%3D&reserved=0> > it > seems to me like adding the IPPM WG community to the discussion is the > right thing to do. > > Please find my notes in-lined below under the GIM>> tag. > > > > Regards, > > Greg > > > > On Wed, Jan 26, 2022 at 2:37 PM Haoyu Song <[email protected]> > wrote: > > Hi SPRING WG, > > > > Real time monitor on every node and every link on a network is necessary > to detect gray failures, which are the key culprit for poor QoS but hard > to catch. SR provides an ideal mechanism, when working with some efficient > planning algorithm, to achieve that with low cost. Our proposal SRv6 > In-situ Active Measurement (SIAM) suggests a simple active measurement > approach which can support different > > GIM>> I wonder what gaps you find in the existing active measurement > protocols, e.g., STAMP and RFC 6734 (would be more convenient to use an > acronym). It appears to me that, for example, STAMP and its extensions, > including the SRPM draft > <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-ippm-stamp-srpm&data=04%7C01%7Chaoyu.song%40futurewei.com%7Cc347a296576a4bcc02dc08d9e11fcba3%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637788348960663433%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=Czxg8dYGfDXViyRtY2Z2vuIKit%2B9Pw0atzLonOVTdfE%3D&reserved=0>, > comprehensively address the PM OAM requirements for SRv6. > > > > HS>> Let’s give a few features of our proposal: (1) it’s session-less and > we don’t need assign any roles (e.g., reflector); (2) no needs for a > return path. The measurement can start and end at any node (solely > determined by the SRH); (3) udp-based which can support any existing IOAM > modes and potentially other OAM methods. > GIM2>> I don't think adding a protocol that can generate a test probe from an arbitrary node to arbitrary targets (SRv6 supports multicast) is as simple as you present. If an operator needs to monitor the performance of the SR policy used by data packets, IOAM can be applied to data packets. If the operator wants to explore a policy that is not used for data traffic, I imagine IOAM can be added to a test packet of the existing OAM protocol, e.g., ICMP. Am I missing some of the requirements? > options of IOAM and other OAM methods in SRv6, without needing to worry > about the extension header issue. > > GIM>> draft-ietf-ippm-ioam-data classifies IOAM as follows: > > In terms of the classification given > > in [RFC7799] IOAM could be portrayed as Hybrid Type 1. > > Does your proposal change that? > > > > HS>> In this particular case, IOAM is used for active measurement because > it’s not included in a user packet. > > > > Your comments, questions, and suggestions are very welcome. I’d like to > know your opinion if you think this work is in scope and should be adopted > by the working group. If you are interested in contributing to this work, > please also let me know. > https://datatracker.ietf.org/doc/draft-song-spring-siam/ > <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-song-spring-siam%2F&data=04%7C01%7Chaoyu.song%40futurewei.com%7Cc347a296576a4bcc02dc08d9e11fcba3%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637788348960663433%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=EgovYo3tJgmCUR8eu0I%2BkF%2Ff9fcfKFGi6gaOycyFM6g%3D&reserved=0> > > > > Thank you very much! > > > > Best regards, > > Haoyu > > _______________________________________________ > spring mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/spring > <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fspring&data=04%7C01%7Chaoyu.song%40futurewei.com%7Cc347a296576a4bcc02dc08d9e11fcba3%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637788348960663433%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=x0ROnWuMAW%2BJhiEROH%2Fg4%2BruahabOaHctwN6eVeX9jw%3D&reserved=0> > >
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