Re: [ippm] FW: New Version Notification for draft-li-ippm-otwamp-on-lag-02.txt

OK, but this requires that the sender runs on the device that performs the
LAG. This would be quite a serious limitation of the feature I believe

On Thu, Jan 27, 2022 at 10:48 AM Tianran Zhou <zhoutianran@huawei.com>
wrote:

> Hi Henrik,
>
>
>
> Both sender and reflector keep the mapping between member link and the
> micro session. Either by configuration or negotiation or auto-learning.
>
> So, in your switch case, if the sender receives the packet from C, not A,
> the sender know it’s wrong. The test packet should be dropped and not
> counted.
>
>
>
> Best,
>
> Tianran
>
> *From:* Henrik Nydell [mailto:hnydell@accedian.com]
> *Sent:* Thursday, January 27, 2022 5:29 PM
> *To:* Tianran Zhou <zhoutianran@huawei.com>
> *Cc:* wangaj3@chinatelecom.cn; IETF IPPM WG <ippm@ietf.org>
> *Subject:* Re: [ippm] FW: New Version Notification for
> draft-li-ippm-otwamp-on-lag-02.txt
>
>
>
> Thanks for the clarification, but this "member link validation mechanism"
> depends fully on configuration between the session sender and the session
> reflector right? So even if they have agreed that a certain session ID
> belongs to lag link A, there is no way to be sure that this is the case,
> the intermediate switches may place these packets randomly over links A-C
> and the TWAMP/OWAMP sender/reflectors will have no knowledge of this. So I
> dont know if this addition adds much usefulnes over the already existing
> capabilities of TWAMP, where you can use the 5-tuple of port-pair, IP-pair
> and TOS to differentiate session from each other.
>
>
>
>
>
> On Thu, Jan 27, 2022 at 2:37 AM Tianran Zhou <zhoutianran@huawei.com>
> wrote:
>
> Hi Henrik,
>
>
>
> Thanks very much for your review.
>
> Your perspective is absolutely correct.
>
> This draft is not able to “guarantee” a specific LAG path. For example,
> there is a switch between the two end points, or in the case the reflector
> is not capable.
>
> I.e., as you said, there is no "one method fits all" to guarantee the path.
>
>
>
> However, this draft seek another way round, the member link validation
> mechanism.
>
> There is an assumption in the introduction “This document intends to
> address the scenario where a LAG directly connects two nodes (A and B).”
>
> With the member link validation, sender/reflector will drop measurement
> data, when the test packet is not from the expected member link.
>
> In this way, the measurement could always be correct.
>
>
>
> This is somewhat similar to Paris Traceroute (
> https://paris-traceroute.net/about/) IMHO.
>
>
>
> Cheers,
>
> Tianran
>
>
>
> *From:* Henrik Nydell [mailto:hnydell@accedian.com]
> *Sent:* Wednesday, January 26, 2022 6:17 PM
> *To:* Tianran Zhou <zhoutianran@huawei.com>
> *Cc:* wangaj3@chinatelecom.cn; IETF IPPM WG <ippm@ietf.org>
> *Subject:* Re: [ippm] FW: New Version Notification for
> draft-li-ippm-otwamp-on-lag-02.txt
>
>
>
> I had a brief review but failed to find details on how the TWAMP sessions
> would be "guaranteed" to travel on a certain LAG segment. As far as I know
> the LAG implementation may be different between vendors and as such I know
> of no "one method fits all" to actually accomplish the measurement.
>
>
>
> So this draft does not actually provide any solution to the problem of
> being able to measure LAG segments separately and deterministically.
>
>
>
> On Wed, Jan 26, 2022 at 11:03 AM Tianran Zhou <zhoutianran=
> 40huawei.com@dmarc.ietf.org> wrote:
>
> Hi Anjun,
>
> Thanks very much for your interest and comments.
> Both are good questions.
> Please see in line.
>
> Cheers,
> Tianran
>
> -----Original Message-----
> From: wangaj3@chinatelecom.cn [mailto:wangaj3@chinatelecom.cn]
> Sent: Wednesday, January 26, 2022 5:21 PM
> To: Tianran Zhou <zhoutianran@huawei.com>; 'IETF IPPM WG' <ippm@ietf.org>
> Subject: RE: [ippm] FW: New Version Notification for
> draft-li-ippm-otwamp-on-lag-02.txt
>
> Hi, Tianran:
>
> Have a brief review of this draft. I think its aim is straightforward and
> will be useful to utilize the member link within the LAG.
> Some comments are below:
> 1) It seems there is no Sender/Reflector behavior description for the
> Mirco OWAMP session and the packet format?
>
>
> ZTR> OWAMP is simple and there is no reflector. The sender cannot get the
> ack from the receiver. So we are not going to extend the OWAMP test packet.
> The behavior is described in section 3.2:
> " The micro OWAMP Sender MUST send the micro OWAMP-Test packets over the
> member link with which the session is associated. When receives a Test
> packet, the micro OWAMP receiver MUST use the member link from which the
> Test packet is received to correlate the micro OWAMP session. If there is
> no such a session, the Test packet MUST be discarded. "
>
> 2) For the newly defined Session-Sender Packet/Session-Reflector Packet,
> how to assure the backward compatibility? What I have seen is that you add
> two additional fields within the existing Packet?
>
> ZTR> I am not aware of the compatibility problem. If a node supports micro
> session, it can understand the new packet extension. If a node does not
> support micro session, it just ignores the new fields. Because the new
> fields is in the reserved zone.
> Moreover, the validation mechanism can figure out if the reflector can
> support the micro session.
>
> Best Regards
>
> Aijun Wang
> China Telecom
>
> -----Original Message-----
> From: ippm <ippm-bounces@ietf.org> On Behalf Of Tianran Zhou
> Sent: Monday, January 24, 2022 2:23 PM
> To: IETF IPPM WG (ippm@ietf.org) <ippm@ietf.org>
> Subject: [ippm] FW: New Version Notification for
> draft-li-ippm-otwamp-on-lag-02.txt
>
> Hi WG,
>
> We think this is an useful work on adapting OWAMP/TWAMP in LAG performance
> measurement.
> We updated this draft based on the comments from the meeting discussion
> and mailing list.
> Thanks for all the suggestions.
> More reviews and comments are welcome.
>
> Cheers,
> Tianran
>
> -----Original Message-----
> From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> Sent: Monday, January 24, 2022 2:17 PM
> To: Greg Mirsky <gregimirsky@gmail.com>; Guo Jun <guo.jun2@zte.com.cn>;
> Jun Guo <guo.jun2@zte.com.cn>; Rakesh Gandhi <rgandhi@cisco.com>; Tianran
> Zhou <zhoutianran@huawei.com>; Zhenqiang Li <li_zhenqiang@hotmail.com>
> Subject: New Version Notification for draft-li-ippm-otwamp-on-lag-02.txt
>
>
> A new version of I-D, draft-li-ippm-otwamp-on-lag-02.txt
> has been successfully submitted by Tianran Zhou and posted to the IETF
> repository.
>
> Name:           draft-li-ippm-otwamp-on-lag
> Revision:       02
> Title:          One-way/Two-way Active Measurement Protocol Extensions for
> Performance Measurement on LAG
> Document date:  2022-01-24
> Group:          Individual Submission
> Pages:          13
> URL:
> https://www.ietf.org/archive/id/draft-li-ippm-otwamp-on-lag-02.txt
> Status:
> https://datatracker.ietf.org/doc/draft-li-ippm-otwamp-on-lag/
> Htmlized:
> https://datatracker.ietf.org/doc/html/draft-li-ippm-otwamp-on-lag
> Diff:
> https://www.ietf.org/rfcdiff?url2=draft-li-ippm-otwamp-on-lag-02
>
> Abstract:
>    This document defines extensions to One-way Active Measurement
>    Protocol (OWAMP), and Two-way Active Measurement Protocol (TWAMP) to
>    implement performance measurement on every member link of a Link
>    Aggregation Group (LAG).  Knowing the measured metrics of each member
>    link of a LAG enables operators to enforce the performance based
>    traffic steering policy across the member links.
>
>
>
>
>
> The IETF Secretariat
>
>
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>
> --
>
>
> *Henrik Nydell*
> *Sr Product Manager*
> 1.866.685.8181
> hnydell@accedian.com
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> *Henrik Nydell*
> *Sr Product Manager*
> 1.866.685.8181
> hnydell@accedian.com
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-- 

*Henrik Nydell*
*Sr Product Manager*
1.866.685.8181
hnydell@accedian.com
<http://accedian.com>
<https://www.facebook.com/accedian/>  <https://twitter.com/Accedian>
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