Re: [netconf] Adoption Call for draft-mahesh-netconf-https-notif-00

"Eric Voit (evoit)" <evoit@cisco.com> Tue, 03 September 2019 15:00 UTC

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From: "Eric Voit (evoit)" <evoit@cisco.com>
To: Kent Watsen <kent+ietf@watsen.net>, Mahesh Jethanandani <mjethanandani@gmail.com>
CC: "netconf@ietf.org" <netconf@ietf.org>
Thread-Topic: [netconf] Adoption Call for draft-mahesh-netconf-https-notif-00
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Date: Tue, 3 Sep 2019 15:00:39 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/netconf/R-8ukrzxi9rVczF3idtiW91kR8I>
Subject: Re: [netconf] Adoption Call for draft-mahesh-netconf-https-notif-00
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I support the adoption.

 

Building upon that, there are a few elements which would be good to consider
in future iterations.

 

(1)  Understanding the capabilities of the configured receiver is important.
One or more publishers of configured subscriptions could be used to
overwhelm a receiver which doesn't even support subscriptions.    This
document should include ways to ensure a configured stream won't be
established with an endpoint unequipped to deal with the inbound
notifications.  As a starting point for these discussions, there are
mechanisms in draft-ietf-netconf-restconf-notif v5 to address this.   E.g.,
the  HTTP transport augmentation on the receiver must send an "HTTP OK" to a
"subscription-started" notification before the publisher starts streaming
any subscribed content.

 

(2)  Multiple versions of draft-ietf-netconf-restconf-notif include
topics/text which might be useful, even as an appendix.   For example
Section B.2 of v5 includes example config operations and interaction models.

 

Side comment:  there are advantages in subscriptions over HTTP2 transports,
which I don't believe it will be covered in this draft.  GRPC has the
ability to optimize based its leverage of HTTP2.    To examples from
draft-ietf-netconf-restconf-notif v5 which are good to think about are:

(a) optimizing multiple configured subscription streams to a single receiver
(such as a controller). 

(b) it can be easier overwhelm a receiver which is unable to control or
handle the volume of Event Notifications received  

It would be good to somehow capture the implications of using different
underlying HTTP capabilities as part of these discussions.

 

Thanks,

Eric

 

From: netconf <netconf-bounces@ietf.org> On Behalf Of Kent Watsen
Sent: Monday, August 26, 2019 6:02 PM
To: netconf@ietf.org
Subject: [netconf] Adoption Call for draft-mahesh-netconf-https-notif-00

 

This email begins a 2-week adoption poll for:

 

    https://tools.ietf.org/html/draft-mahesh-netconf-https-notif-00

In-room support for this draft was noted but, as always, it is necessary to
confirm WG consensus on the list.  If interested in the WG defining an
HTTPS-based solution for *configured subscriptions* (for which there are
none to date), please voice your support for this draft's adoption.  If
objecting, please state your reasons.  

 

PS: Authors, please additionally respond to as if there is any IPR to
disclose.


Kent and Mahesh // as chairs