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Re: [ippm] Request for reviews of OWAMP/TWAMP/STAMP on LAG

Tianran Zhou <zhoutianran@huawei.com> Thu, 27 April 2023 23:59 UTC

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From: Tianran Zhou <zhoutianran@huawei.com>
To: Haoyu Song <haoyu.song@futurewei.com>, Marcus Ihlar <marcus.ihlar=40ericsson.com@dmarc.ietf.org>, "IETF IPPM WG (ippm@ietf.org)" <ippm@ietf.org>
Thread-Topic: Request for reviews of OWAMP/TWAMP/STAMP on LAG
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Date: Thu, 27 Apr 2023 23:59:20 +0000
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Subject: Re: [ippm] Request for reviews of OWAMP/TWAMP/STAMP on LAG
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Hi Haoyu,

Thanks very much for your review and questions.
Please see inline for the clarification.

Best,
Tianran

From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Haoyu Song
Sent: Wednesday, April 26, 2023 1:43 AM
To: Marcus Ihlar <marcus.ihlar=40ericsson.com@dmarc.ietf.org>; IETF IPPM WG (ippm@ietf.org) <ippm@ietf.org>
Subject: Re: [ippm] Request for reviews of OWAMP/TWAMP/STAMP on LAG

IPPM,

I have read the documents and have several questions to the authors for clarification.

  1.  The document says that the measurement results can be used for traffic steering. AFAIK, LAG uses hashing for load balancing. Are you suggesting the new methods/algorithms for traffic distribution? Is there any existing or planed work for this?
ZTR> Yes, LAG normally use hash for LB. But as for the described use case, there is requirement to explicitly control the traffic steering. We already implement this, but I do not think more standard work is necessary.


  1.  This seems a proposal to use L3 protocols for L2 measurements. Is the L2 feature visible and manageable to the L3 entity?
ZTR> Maybe it’s not L3 protocol, but actually L4, anyway not relevant ☺. That’s why we need an identifier, i.e., micro session id, to associate the L2 interface with the test session. So that the test session (L4), know the link between two L2 interfaces.


  1.  Can you list the performance metrics that are measured and of interest to the LAG case for readers to better understand the motivation?
ZTR> I am not sure if I can list all. Because it depends on the specific use cases, although in theory all metrics could be possible . It may be delay or loss in most case. I think we can mention the metrics used in the described traffic steering use case in this draft.

Thanks!

Best,
Haoyu

From: ippm <ippm-bounces@ietf.org<mailto:ippm-bounces@ietf.org>> On Behalf Of Marcus Ihlar
Sent: Wednesday, April 19, 2023 8:08 AM
To: IETF IPPM WG (ippm@ietf.org<mailto:ippm@ietf.org>) <ippm@ietf.org<mailto:ippm@ietf.org>>
Subject: [ippm] Request for reviews of OWAMP/TWAMP/STAMP on LAG

Hi IPPM,
During the IPPM session at IETF 116 the authors of  draft-ietf-ippm-otwamp-on-lag and draft-ietf-ippm-stamp-on-lag expressed that they believe the documents are ready for WGLC.
However, since these documents were adopted quite recently we’d like to ask the WG to take some time to read them and provide feedback.

In response to this mail, please indicate whether you’ve read the document along with any feedback you might have.

Note that this is not an official working group last call.

The documents can be found here:
https://datatracker.ietf.org/doc/draft-ietf-ippm-stamp-on-lag/
https://datatracker.ietf.org/doc/draft-ietf-ippm-otwamp-on-lag/

HTML versions:
https://www.ietf.org/archive/id/draft-ietf-ippm-stamp-on-lag-01.html
https://www.ietf.org/archive/id/draft-ietf-ippm-otwamp-on-lag-01.html

BR
Marcus

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