Re: [Lime-oam-model] Design Team report

Gregory Mirsky <gregory.mirsky@ericsson.com> Mon, 16 March 2015 23:50 UTC

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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: Qin Wu <bill.wu@huawei.com>, Ronald Bonica <rbonica@juniper.net>, "lime-oam-model@ietf.org" <lime-oam-model@ietf.org>
Thread-Topic: Design Team report
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Date: Mon, 16 Mar 2015 23:49:53 +0000
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Cc: "Deepak Kumar \(dekumar\)" <dekumar@cisco.com>
Subject: Re: [Lime-oam-model] Design Team report
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Dear Qin,
many thanks for building very informative presentation on behalf of the DT.
Couple notes:

¡¤         When talking about IP OAM I mean OAM for IP and LDP-based IP/MPLS networks. Perhaps p.6 may be good place to make such clarification;

¡¤         to table on p.11:

o   connectivity verification assumes that there exists definition of miss-connection defect along with definitions of in-defect and out-defect conditions. I believe that neither IP, nor IP/MPLS had so far defined miss-connection defect and it only exists for MPLS-TP in RFC 6428. I think that table should be updated to reflect that only MPLS Echo Request/Reply, a.k.a. LSP Ping does support connectivity verification while other OAM mechanisms listed in the Connectivity Verification column (BFD, ICMP Ping, OWAMP/TWAMP Control protocols) do not support it;

o   not clear what role OWAMP/TWAMP control protocols play as Continuity Check OAM mechanism. Is it because they use TCP connection between Server and Control Client? But Server and Control Client could be network elements outside of Sender and Receiver/Reflector. By the same logic, should any application, e.g. BGP, that uses TCP connection be considered as Continuity Check OAM mechanism? I don¡¯t think that is the case.

o   does TRILL OAM support Alarm suppression, Automatic Protection Switchover coordination like Y.1731?

o   MPLS-TP OAM includes Protection Switchover Coordination protocol RFC 6378;

o   I¡¯m not familiar with Diagnostic Test or Client Failure Notification is MPLS ¨CTP OAM function or mechanism, could you please help with the reference;

¡¤         I¡¯d like the Conclusion page to use two last bullets from p.6:

o   Make sure the LIME model proposed in /draft-tissa-lime-yang-oam-model-03 support IP OAM feature.

o   Or define IP OAM model first and separate it from LIME OAM model if the current model cannot support IP OAM.

Regards,
                Greg

From: Qin Wu [mailto:bill.wu@huawei.com]
Sent: Saturday, March 14, 2015 1:26 AM
To: Ronald Bonica; Gregory Mirsky; lime-oam-model@ietf.org
Cc: Deepak Kumar (dekumar)
Subject: Design Team report

Hi, Design team members:
Based on Ron¡¯s request, Greg and I had a conference call on Friday and discussed LIME OAM model again, Deepak also joined the discussion.
Based on the discussion, I think we generally agreed commonality among various OAM technologies. The current model is applicable in IP for VPN technologies but not sure about non VPN scenarios which require more discussion.

Here is the initial version of Design team report we like to deliver and present at IETF92.
I like to ask your review and input. Thanks!

BTW: I apologize for the confusion as Tissa and nobo were left. Welcome Santosh on board.

Regards!
-Qin
·¢¼þÈË: Ronald Bonica [mailto:rbonica@juniper.net]
·¢ËÍʱ¼ä: 2015Äê3ÔÂ10ÈÕ 21:42
ÊÕ¼þÈË: Qin Wu; Gregory Mirsky; lime-oam-model@ietf.org<mailto:lime-oam-model@ietf.org>
³­ËÍ: Deepak Kumar (dekumar)
Ö÷Ìâ: RE: Status

Greg, Qin,

Why don¡¯t you two guys meet f2f. Bring up a conference bridge so that others can join you remotely.

                                                           Ron


From: Qin Wu [mailto:bill.wu@huawei.com]
Sent: Tuesday, March 10, 2015 12:35 AM
To: Ronald Bonica; Gregory Mirsky; lime-oam-model@ietf.org<mailto:lime-oam-model@ietf.org>
Cc: Deepak Kumar (dekumar)
Subject: RE: Status

Works for me.

-Qin
·¢¼þÈË: Ronald Bonica [mailto:rbonica@juniper.net]
·¢ËÍʱ¼ä: 2015Äê3ÔÂ10ÈÕ 9:30
ÊÕ¼þÈË: Gregory Mirsky; Qin Wu; lime-oam-model@ietf.org<mailto:lime-oam-model@ietf.org>
³­ËÍ: Deepak Kumar (dekumar)
Ö÷Ìâ: RE: Status

Folks,

Can I ask the design team to meet urgently this week and come to one of the following conclusions? Either:


1)      We have complete consensus and it is ¡­¡­¡­

2)      We have complete consensus on A, B and C. We don¡¯t have consensus on D, E, and F

3)      We can¡¯t even agree on the questions

If the answer is 2), please be prepared to describe A, B, C, D, E and F at IETF 92. Also, be prepared to describe the rationale between opposing positions.

                                                                         Ron



4)      We have consensus and it is {{From: Gregory Mirsky [mailto:gregory.mirsky@ericsson.com]
Sent: Monday, March 09, 2015 12:12 PM
To: Qin Wu; Ronald Bonica; lime-oam-model@ietf.org<mailto:lime-oam-model@ietf.org>
Cc: Deepak Kumar (dekumar)
Subject: RE: Status

Hi Qin, Ron, et. al,
apologies for the extended absence from the discussion.
I believe that the statement that:
> CFM like model as management plane model is orthogonal to data plane
> OAM protocol and meet all these requirements.
Does not entirely reflect state of discussion within the DT, especially that "CFM like model ¡­ meets all the requirements".

And I cannot agree with the conclusion here either:
> Also MP (assume that 'MP' stands for 'Maintenance Point') terminologies are widely used in the most of OAM technologies,
> it is not a good idea to define new terminologies to represent common
> elements for the OAM model.
It is not about luck of terminology but luck of terminology likely indicates that respective objects not being identified or used. Hence, if we to build common OAM model, objects should be identified and defined, including through terminology. Alternatively, we have OAM technologies that share sufficient commonality to work with.

        Regards,
                Greg

-----Original Message-----
From: Lime-oam-model [mailto:lime-oam-model-bounces@ietf.org] On Behalf Of Qin Wu
Sent: Monday, March 09, 2015 2:08 AM
To: Ronald Bonica; lime-oam-model@ietf.org<mailto:lime-oam-model@ietf.org>
Cc: Deepak Kumar (dekumar)
Subject: Re: [Lime-oam-model] Status

Hi, Ron:
-----ÓʼþÔ­¼þ-----
·¢¼þÈË: Ronald Bonica [mailto:rbonica@juniper.net]
·¢ËÍʱ¼ä: 2015Äê3ÔÂ7ÈÕ 5:28
ÊÕ¼þÈË: Qin Wu; lime-oam-model@ietf.org<mailto:lime-oam-model@ietf.org>
³­ËÍ: Deepak Kumar (dekumar)
Ö÷Ìâ: RE: Status

Qin,

Thanks for this summary. Unless I hear otherwise, I will assume that this is the group's consensus.

[Qin]: It has been a few days and no-one has disagreed.

IMHO, the design team has three tasks standing between itself and completion:

- craft a slide deck documenting findings

[Qin]: I will write the first draft and we can discuss on this list.

- present that slide deck at IETF 92

[Qin]: I am happy to do this if no one has objection.

- produce an ID recording findings

[Qin]: I can also start this task. I think I can make a first draft before Dallas, but I am not allowed to post it until Monday morning of IETF week in Dallas.

Is that OK?

Thanks.

Do we have volunteers for any of those tasks?

                                                                 Ron


> -----Original Message-----
> From: Lime-oam-model [mailto:lime-oam-model-bounces@ietf.org] On
> Behalf Of Qin Wu
> Sent: Thursday, March 05, 2015 10:38 PM
> To: Ronald Bonica; lime-oam-model@ietf.org<mailto:lime-oam-model@ietf.org>
> Cc: Deepak Kumar (dekumar)
> Subject: Re: [Lime-oam-model] Status
>
> Ron:
> If my understanding is correct, here is the status of group discussion.
> Based on first design team discussion ,people agreed to sort out
> common OAM requirements first, Greg provides OAM (Data) Model Analysis
> table from his perspective which compares IP OAM, IP/MPLS OAM, MPLS-TP
> OAM, TRILL OAM from several criteria and lists several common
> requirements.
>
> Based on OAM Model Analysis, common elements used for OAM model are
> agreed, e.g., testing point, connection oriented vs
> connectionless,loss of continuity defect,fault domain,technology type,
> addressing, ECMP, common OAM functions(e.g., cc,cv, path discovery, performance measurement).
>
> CFM like model as management plane model is orthogonal to data plane
> OAM protocol and meet all these requirements.
> Also MP terminologies are widely used in the most of OAM technologies,
> it is not a good idea to define new terminologies to represent common
> elements for the OAM model.
>
> Therefore my understanding is that the choice of an OAM model seems to
> have no impact on the LIME work.
> LIME model focuses on common part of various OAM technologies,
> therefore LIME's work can be made "model agnostic".
>
> Regards!
> -Qin
> -----ÓʼþÔ­¼þ-----
> ·¢¼þÈË: Lime-oam-model [mailto:lime-oam-model-bounces@ietf.org] ´ú±í
> Ronald Bonica
> ·¢ËÍʱ¼ä: 2015Äê3ÔÂ2ÈÕ 6:40
> ÊÕ¼þÈË: lime-oam-model@ietf.org<mailto:lime-oam-model@ietf.org>
> Ö÷Ìâ: [Lime-oam-model] Status
>
> Folks,
>
> Since the group's formation, we have lost two members (Nobo and Tissa).
> Santosh PK will replace Nobo.
>
> Could Qin or Greg summarize that group's status for Santosh?
>
> Also, Qin and Greg, do you think that the design team will have
> anything to report at IETF 92?
>
>                                                 Ron Bonica
>
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