Hello,
I think to manage the 7750, you are currently using the alu-sr NED, that manages the device via the CLI. The yang models in the CLI NEDs reflect what is in the CLI and are unrelated to yang models exposed by the device.
So you cannot simply add a yang file that the device exposes over Netconf and use it. That is simply because the NED uses CLI (ssh/telnet) interface but that model is exposed via the Netconf interface .
What you can do though, is if some commands in the cli are not recognised by the NED, you can open a TAC case and have the CLI NED enhanced to cover the specific commands you are missing. You will have to provide details of what you want to configure. Configure the things you want manually, and then turn on tracing for the device, run a sync-from and attach the trace to the TAC case. This is often quite a quick process because it sometimes just involves adding a few leaves into the yang model that is included in the NED to cover some extra options on commands. You can even make the changes yourself in the NED yang file locally, but do open the TAC case anyway so that you have a supported new NED version that includes the features you need. You may also want to check if a newer NED already covers those commands. Just download the latest NED and look at the CHANGES file.
Alternatively you might want to switch to managing the device via Netconf. That is a larger project, because the yang model for a device we include with the CLI NED is different from the yang models that the device exposes natively, so for example you need to rewrite any templates. You could start by looking at the ned builder feature in NSO to build your Netconf NED for the specific SROS version running on your Nokia device. On Nokia SROS there is an extra complication. To use Netconf Yang you switch the device to a ‘model driven’ mode. That changes the CLI also, and the device is then no longer manageable via the existing CLI NED which works in the ’classic’ mode, so you would need to carefully plan a switch-over from one mode to the other.
