One way to support notifications for topology in a generic way will be through 
YANG-Push (see https://tools.ietf.org/html/draft-ietf-netconf-yang-push-15).  
Configure a subscription for on-change updates against the topology data tree.  
That will give applications what they need without the definition of custom 
notifications (which can of course also still be done).

--- Alex

> -----Original Message-----
> From: i2rs [mailto:[email protected]] On Behalf Of Susan Hares
> Sent: Friday, May 04, 2018 1:39 PM
> To: Dongjie (Jimmy) <[email protected]>; 'Ladislav Lhotka' <[email protected]>
> Cc: [email protected]; 'Martin Vigoureux' <[email protected]>
> Subject: Re: [i2rs] Yangdoctors early review of 
> draft-ietf-i2rs-yang-l2-network-
> topology-04
> 
> Jie and Lada:
> 
> I've recently listened to the I2RS meeting in IETF 101.
> 
> Chris Hopps asked about the notifications in L2.  He was asking about a more
> general use of the notification that might be useful in the
> 
> I'm not really sure how to approach responding to his operational request - 
> since
> it really impacts all topology models.  My inclination is to push this draft 
> through
> into RFC usage, and then to work through a "-bis"
> functionality.
> 
> Jie - would you ask the individuals pushing for L2 model if that works for 
> them.
> 
> Lada - would you ask the Yang doctors if this is the right approach to take.
> Of course, this might be easier if we had versioning instead of a model name
> change.
> 
> Sue Hares
> -----Original Message-----
> From: i2rs [mailto:[email protected]] On Behalf Of Dongjie (Jimmy)
> Sent: Thursday, May 3, 2018 10:09 PM
> To: Ladislav Lhotka; [email protected]
> Cc: [email protected]; [email protected];
> [email protected]
> Subject: Re: [i2rs] Yangdoctors early review of
> draft-ietf-i2rs-yang-l2-network-topology-04
> 
> Hi Lada,
> 
> Thanks a lot for your review comments. Please see some replies inline:
> 
> > -----Original Message-----
> > From: Ladislav Lhotka [mailto:[email protected]]
> > Sent: Wednesday, May 02, 2018 9:32 PM
> > To: [email protected]
> > Cc: [email protected]; [email protected];
> > [email protected]
> > Subject: Yangdoctors early review of
> > draft-ietf-i2rs-yang-l2-network-topology-04
> >
> > Reviewer: Ladislav Lhotka
> > Review result: Ready
> >
> > This draft and YANG modules contained therein fit into the framework
> > of I2RS network topology models. I have no substantial comments, from
> > the YANG point of view this document is ready to be published.
> >
> > Comments and questions:
> >
> > 1. What is the purpose of the 'flag-type' type and 'flag-identity'
> identity?
> > There are no identities derived from the latter.
> 
> The "flag-type" type is used in the grouping "l2-network-attributes", 
> "l2-node-
> attributes" and "l2-link-attributes".
> 
> While there is no identities derived from the "flag-identity", it is used in 
> the
> typedef flag-type. Is this OK?
> 
> > 2. Some descriptions overuse capitalization. For example, instead of
> > 'VLAN
> Name'
> > I would suggest 'VLAN name'.
> 
> Thanks for catching this. Will fix in next revision.
> 
> > 3. An example of an instance document in an appendix would be very
> helpful.
> 
> Thanks for your suggestion. We will add an example to the appendix.
> 
> Best regards,
> Jie
> 
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