[netmod] datastore-specific constraints

Ladislav Lhotka <lhotka@nic.cz> Wed, 12 December 2018 14:33 UTC

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From: Ladislav Lhotka <lhotka@nic.cz>
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Date: Wed, 12 Dec 2018 15:33:15 +0100
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Subject: [netmod] datastore-specific constraints
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Hi,

in some cases, constraints expressed with "when" or "must" may only be
intended for configuration datastores. A typical example is an
auto-negotiable parameter:

leaf auto-foo {
  type boolean;
  default true;
  description "If true, parameter 'foo' will be auto-negotiated.";
}
leaf foo {
  when "../auto-foo = 'false'";
  ...
}

This means that if auto-foo is true, it is impossible to configure the
foo parameter. However, even with auto-foo = true, it is desirable to
see the auto-negotiated value in <operational>, so, ideally, the "when"
constraint should not apply in <operational>.

How can this logic be modelled under NMDA? Is an extra leaf
"foo-operational" needed?

Thanks, Lada

-- 
Ladislav Lhotka
Head, CZ.NIC Labs
PGP Key ID: 0xB8F92B08A9F76C67