On 06/12/2017 08:31 PM, Andy Bierman wrote:
On Mon, Jun 12, 2017 at 10:21 AM, Juergen Schoenwaelder
<[email protected]
<mailto:[email protected]>> wrote:
On Fri, Jun 09, 2017 at 10:55:20AM +0000, Bogaert, Bart (Nokia -
BE/Antwerp) wrote:
>
> We have a question regarding the statistics container as defined
in the
> interfaces-state model. This container defines one mandatory leaf
> (discontinuity-time) while all other leafs are optional. What
is the
> rationale behind this leaf being mandatory and not an optional
field?
>
> It does not make a lot of sense to return a discontinuity-time
value and no
> counters if none of the counters are relevant for a specific
interface.
>
> Another alternative could be to add, via a deviation, a when
clause to the
> container indicating for which ifType(s) the container is (or is
not)
> present. But that would lead to not supporting the IETF
interfaces model to
> the full extent.
>
The alternative which we use is to not have
/interfaces-state/interface/statistics container for the interfaces
without counters. The container is mandatory=false.
The discontinuity-time is relevant for _any_ counter associated with
an interface, regardless whether the counter is defined in the
interfaces model or elsewhere. I have a hard time to imagine an
interface that has zero counters.
There are some though. Optical amplifiers and similar equipment that
does not have counters - the status data is only signal levels.
The mandatory-stmt is very confusing for config=false nodes.
Mandatory=true means
an <rpc-reply> must contain an instance of the mandatory leaf.
Mandatory=false does not mean optional-to-implement although it sure
looks that way for config=false nodes. Only if-feature can make a
node optional to implement.
If we take serial interface with hardware that only has in-octets and
out-octets counters I would expect to only find these two in
/interfaces-state/interface/statistics + discontinuity-time. Do you say
the rest of the counters must be present (e.g. allways 0) for proper
implementation of ietf-interfaces?
Vladimir
/js
Andy
--
Juergen Schoenwaelder Jacobs University Bremen gGmbH
Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany
Fax: +49 421 200 3103 <http://www.jacobs-university.de/
<http://www.jacobs-university.de/>>
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