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[netconf] Re: YANG Push Lite presentation

"Rob Wilton (rwilton)" <rwilton@cisco.com> Mon, 11 November 2024 17:58 UTC

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From: "Rob Wilton (rwilton)" <rwilton@cisco.com>
To: Reshad Rahman <reshad@yahoo.com>, Netconf <netconf@ietf.org>, Andy Bierman <andy@yumaworks.com>
Thread-Topic: [netconf] Re: YANG Push Lite presentation
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Date: Mon, 11 Nov 2024 17:58:27 +0000
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Subject: [netconf] Re: YANG Push Lite presentation
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Hi Andy,

Please see inline …

From: Reshad Rahman <reshad=40yahoo.com@dmarc.ietf.org>
Date: Friday, 8 November 2024 at 16:18
To: Netconf <netconf@ietf.org>, Andy Bierman <andy@yumaworks.com>
Subject: [netconf] Re: YANG Push Lite presentation
Hi Andy,

> I do not understand the issue with dampening.
Within the implementation, it means how often you check for changes.
It is effectively the same as the 'period' for a periodic subscription.
How does an on-change subscription work without this parameter?

For on-change events we are generally event driven.  I.e., if the hardware notifies that the hardware link has gone down, and there was an on-change subscription on that node then that would be used as a trigger to generate an on-change notification.

I agree that on-change for stats doesn’t make much sense, but you can sample on a given period and report what has changed (but this requires that you keep a copy to compare and know what has changed).

Regards,
Rob



In the context of continuously changing data such as counters I understand the statement above. But for state changes, dampening-period isn't needed (although I realize this is implementation specific).

Regards,
Reshad.


On Friday, November 8, 2024 at 11:08:24 AM EST, Andy Bierman <andy@yumaworks.com> wrote:


Hi,

I hope this work gets high priority.
There are many I-Ds already so please do not start over or greatly expand the scope.
I have been saying that YANG Push is too complicated since I was on the DT
that created RFC 8639,40,41.

We have a fairly complete implementation of dynamic subscriptions.
Glad to see there is now consensus to get rid of the YANG Patch update.
We decided the same thing a long time ago:
https://docs.yumaworks.com/en/latest/cli/netconfd-pro.html#push-simop-patch-update

Also agree that a push update is not a full replace, but rather just
gather what is being reported.  That is also how our server works.

I do not understand the issue with dampening.
Within the implementation, it means how often you check for changes.
It is effectively the same as the 'period' for a periodic subscription.
How does an on-change subscription work without this parameter?


Andy



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