topic Re: Using "Empty" type for configuration in Tools

Using "Empty" type for configuration

MahdiR — Mon, 21 Sep 2020 11:30:11 GMT

Hi,

I'm trying to change admin status of an interface on a XE device (ASR920).

However running the code below does not seem to have any affect! It runs with no errors, but the interface status doesn't change.

Also if setting shutdown to Empty() brings the interface down, how can I bring it back up again?

import logging
import ydk.models.cisco_ios_xe.Cisco_IOS_XE_native as xe_native
from ydk.services.netconf_service import NetconfService, Datastore
from ydk.providers.netconf_provider import NetconfServiceProvider
from ydk.types import Empty


def enable_logging(level):
    log = logging.getLogger('ydk')
    log.setLevel(level)
    handler = logging.StreamHandler()
    formatter = logging.Formatter(
        "%(asctime)s - %(name)s - %(levelname)s - %(message)s")
    handler.setFormatter(formatter)
    log.addHandler(handler)


def shutdown(native):
    gigabitethernet = native.interface.GigabitEthernet()
    gigabitethernet.name = "0/0/7"
    gigabitethernet.shutdown = Empty()
    native.interface.gigabitethernet.append(gigabitethernet)


if __name__ == "__main__":
    enable_logging(logging.DEBUG)

    service = NetconfService()
    provider = NetconfServiceProvider(address="address",
                                      username="username",
                                      password="password")

    native = xe_native.Native()

    shutdown(native)

    service.edit_config(provider=provider, target=Datastore.running, config=native)

Attachment: DEBUG output from the logger

Re: Using "Empty" type for configuration

yangorelik — Mon, 21 Sep 2020 15:55:44 GMT

In YANG model:

leaf shutdown {
   description
     "Shutdown the selected interface";
    type empty;
}

That means, if the leaf is set to Empty value (present), then interface is shut down; if the leaf is not present, then interface is up. This is basically repeats the CLI logic. Hence, if you want to bring interface up, you need delete leaf 'shutdown'.

import logging
import ydk.models.cisco_ios_xe.Cisco_IOS_XE_native as xe_native
from ydk.services.netconf_service import NetconfService, Datastore
from ydk.providers.netconf_provider import NetconfServiceProvider
from ydk.types import Empty


def enable_logging(level):
    log = logging.getLogger('ydk')
    log.setLevel(level)
    handler = logging.StreamHandler()
    formatter = logging.Formatter(
        "%(asctime)s - %(name)s - %(levelname)s - %(message)s")
    handler.setFormatter(formatter)
    log.addHandler(handler)


def down_up(provider, shutdown_value):
    gigabitethernet = native.interface.GigabitEthernet()
    gigabitethernet.name = "0/0/7"
    gigabitethernet.shutdown = shutdown_value
    native = xe_native.Native()
    native.interface.gigabitethernet.append(gigabitethernet)

    service = NetconfService() 
    service.edit_config(provider=provider, target=Datastore.running, config=native)


if __name__ == "__main__":
    enable_logging(logging.DEBUG)

    provider = NetconfServiceProvider(address="address",
                                      username="username",
                                      password="password")
    # Shutdown interface
    down_up(provider, Empty())

    # Bring up interface 
    down_up(provider, YFilter.delete)

Re: Using "Empty" type for configuration

MahdiR — Mon, 21 Sep 2020 16:04:54 GMT

Thanks! It worked 🙂