Dear OPSAWG and Netmod colleagues,
During last IETF Opsawg meeting we raised a question (and there
was some discussion during the meeting) that we have found yet no good answer
and we would like to discuss it with operations and Yang experts.
The use case is the following: We have a yang module which
holds certain optional leafs. The behaviors that we would like to have (and
distinguish between them) are:
a) The user does not provide the value and such value is auto-assigned by
the system (a device (if it is a device module) or a controller (if it is a
network/service module)).
b) The user does not provide a value and wants that such value IS NOT set
by the system (as assigning a value has implications). That is, intentionally
it is aimed at being left "empty" and should not be expanded. So, either the
value is set or should remain empty
What is the best way to model this behavior? I see that some yang modules have
added an "auto-assignment" leaf to express if auto-assignment is desired or
not. (hence, auto-assignment false, and leaf not set, would do not assign).
Which is the "default" rule for a leaf that is not set? It is that the system
is free to create it (via template or any means of auto-assignment) or should
leave it as is, that is, empty?
In NMDA, the system is allowed to expand a given configuration. This fact, in
my personal view, implies that by "default" any system could implement the
"auto-assignment" behavior being compliant with Neconf/Restconf/NMDA rules (but
I am not sure if the interpretation is correct).
Best Regards,
Óscar
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