Is it allowed to augment built-in YANG modules?

CDB and CDB API
1

Hi,

I am currently using Confd-6.4.3 and I am trying to augment the ‘get-config’ rpc that is defined in the built-in YANG module ietf-netconf.

In order to do so, I created and compiled the following YANG module:

module test {
 namespace "my:test";
 prefix test;

 import ietf-netconf { prefix nc; }

 augment /nc:get-config/nc:input {
   leaf dummy {
     type string;
   }
 }
}

But when I started Confd, I got the following error:
Failed to load file ./test.fxs: Missing augment path /get-config in module ietf-netconf, augmented from module test.

Does this mean that it is forbidden to augment built-in YANG modules ?

Thanks for your help,
BR,
Roger

2

No, that error doesn’t mean that, but in general it can be problematic to do it. This particular error is due to the fact that since the ietf-netconf module is actually the specification of the NETCONF protocol, which is implemented “directly” in the NETCONF server code, the ietf-netconf module isn’t really loaded as-is.

But if it had worked, that augmentation would definitely have been “problematic” if actually used - what did you expect to achieve with it? The get-config RPC is of course completely implemented in the NETCONF server - how would it know what to do with the additional leaf in the input if it was provided?