Re: [OPSAWG] Comments on draft-opsawg-ersue-coman-probstate-reqs

[Juergen Schoenwaelder <[e-mail]>]

On Wed, Jan 15, 2014 at 04:47:17PM -0500, James Nguyen wrote:
> Hi,
> 
> I really enjoy reading this draft.  In general, in my opinion is very
> useful for managing constrained devices.
> 
> I have a couple of questions/suggestions:
> 
> (1) Req-ID 4.3.002 Title: Capacity Discovery
> 
>      I don't quite understand this req.  Please be more specific.

Here is the text (it is _capability_ not _capacity_ discovery):

   Req-ID:  4.3.002

   Title:  Capability Discovery

   Description:  Enable the discovery of supported optional management
      capabilities of a device and their exposure via at least one
      protocol and/or data model.

Devices may have different levels of management support. This
requirement says that it should be possible to discover any optional
management capabilities. What is unclear here? How can we improve it?
 
> (2) Section 3.3 Configuration Management
> 
>      Session-oriented configuration protocol may be expensive for managing
> a large number of similar devices.  In a case when common redundant
> configurations is issued, reliable multicast with negative acknowledgement
> (e.g. Negative ACKnowledgement (NACK)-Oriented Reliable Multicast (NORM))
> would work best.  I suggest to add a reliable transport requirement in this
> section.  Moreover, a common data model would be needed.
> 
>      Stateless configuration update solution would also work well for
> constrained networks.

My assumption is that reliable multicast protocols are not simple and
bring their own can of worms. Can you point to prototype systems that
do successfully use reliable multicast to configure constrained
devices?

Can you also elaborate what "stateless configuration update solution"
means to you?

> (3) Section 3.8 Group-based provisioning
> 
>      As I mentioned in (2), a common data model would be required for
> common redundant configurations.  I suggest to add this requirement here.

Yes, perhaps we have to say something explicit about this.

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: [phone]         Campus Ring 1, 28759 Bremen, Germany
Fax:   [phone]         <http://www.jacobs-university.de/>