Interface no shutdown

how to "no shutdown" the interface. Can only find the interface_configuration.shutdown=empty() to explicitly shutdown the interface but can't find a function to explicitly no shutdown the interface.

Assuming you have the Cisco_IOS_XR_ifmgr_cfg module imported as xr_ifmgr_cfg, this fragment of code shows how to do this: 

from ydk.types import DELETE

if __name__ == "__main__":

    provider = NetconfServiceProvider(...)

    crud = CRUDService() 

    interface_configurations = xr_ifmgr_cfg.InterfaceConfigurations()

    interface_configuration = interface_configurations.InterfaceConfiguration()

    interface_configuration.active = "act"

    interface_configuration.interface_name = "GigabitEthernet0/0/0/0"

    interface_configuration.shutdown = DELETE()

    interface_configurations.interface_configuration.append(interface_configuration) 

    # delete configuration on NETCONF device

    crud.update(provider, interface_configurations) 

The important points to note are:

1. The import of the special type "DELETE"
   
2. The use of the special type "DELETE", an instance of which is assigned to "interface_configuration.shutdown".
3. Using "crud.update" to update the field inside the object.
   

•     It works when the interface is "admin shutdown". However, if the interface is up, can't use this method. It causes an additional step to check the interface status first before issuing this. Is it possible to "no shutdown" the interface without query the interface status.

======================================

ydk.errors.YPYServiceProviderError: Server rejected request.

        error-type: application

        error-tag: data-missing

        error-severity: error

        error-path: ns1:interface-configurations/ns1:interface-configuration[active = 'act' and interface-name = 'GigabitEthernet0/0/0/0']/ns1:shutdown

Right now,no, you can't do what you want with the YDK. This is because of how we map operations through to the underlying netconf protocol. DELETE maps to operation='delete' in netconf, which requires that the data to be deleted exists, or an error is generated. Netconf can do this, with operation='remove', but this is not supported today. It would be a fairly simple enhancement if you want to try patching this. You would need to: 

• Introduce a new class "REMOVE" in the file ydk-gen/types.py at master · CiscoDevNet/ydk-gen · GitHub
• Modify _encoder.py (near ydk-gen/_encoder.py at master · CiscoDevNet/ydk-gen · GitHub) to have an elif clause for the new "REMOVE" class to generate the correct netconf binding. Probably something like:

            elif isinstance(value, REMOVE) and not is_filter:

                xc = 'urn:ietf:params:xml:ns:netconf:base:1.0'

                member_elem.set('{' + xc + '}operation', 'remove') 

Feel free to either http://cs.co/ydk-gen and try this out, or submit an issue. Hope this helps!