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[Rtg-yang-coord] container with presence

Ladislav Lhotka <lhotka@nic.cz> Thu, 28 May 2015 09:28 UTC

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From: Ladislav Lhotka <lhotka@nic.cz>
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Date: Thu, 28 May 2015 11:28:44 +0200
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Subject: [Rtg-yang-coord] container with presence
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Hi,

I have a suggestion for the authors of all routing protocol modules: the container that encapsulates all configuration data for a given protocol should be a container with presence (see sec. 7.5.1 in RFC 6020) because then the configuration data may include mandatory items that are otherwise forbidden at the top level of an augment.

See also YANG 1.1 issue Y26:

https://svn.tools.ietf.org/svn/wg/netmod/yang-1.1/issues.html#sec-27

For example, in the the ietf-isis it should look like this:

     augment "/rt:routing/rt:routing-instance/rt:routing-protocols/"
         +"rt:routing-protocol" {
       when "rt:type = 'isis:isis'" {
         description
          "This augment is only valid when routing protocol
           instance type is isis.";
       }
       presence "IS-IS routing protocol”;
       ...
     }

I am also including this recommendation in the routing-cfg draft.

Lada
--
Ladislav Lhotka, CZ.NIC Labs
PGP Key ID: E74E8C0C

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