IOS-XE ydk.errors.YPYModelError: Invalid value "ianaift:ethernetCsmacd" in "type" element

[dmfigol]

Current Behavior

Python script crashes when I operate with ietf_interfaces yang model

Expected Behavior

It should not crash with the valid RPC reply.

Steps to Reproduce

Take the device running IOS-XE 16.6.1 and run the following script using ydk-models-cisco-ios-xe version 16.6.1.post1

Script

import logging
from ydk.services import CRUDService
from ydk.providers import NetconfServiceProvider
from ydk.models.ietf import ietf_interfaces
from ydk.models.openconfig import openconfig_interfaces

HOST = "csr-16.6-gs"
USERNAME = "cisco"
PASSWORD = "cisco"

def main():
    log = logging.getLogger('ydk')
    log.setLevel(logging.INFO)
    handler = logging.StreamHandler()
    log.addHandler(handler)

    provider = NetconfServiceProvider(address=HOST, username=USERNAME, password=PASSWORD)

    crud = CRUDService()
    query = ietf_interfaces.Interfaces()
    # query = openconfig_interfaces.Interfaces()
    interfaces = crud.read(provider, query)

if __name__ == '__main__':
    main()

Logs

Path where models are to be downloaded: /Users/dmfigol/.ydk/csr-16.6-gs:830
Connected to csr-16.6-gs on port 830 using ssh with timeout of -1
Executing CRUD read operation
=============Generating payload to send to device=============
<rpc xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"><get xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <filter><interfaces xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces"/></filter>
</get>
</rpc>


=============Reply payload received from device=============
<?xml version="1.0" encoding="UTF-8"?>
<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="1">
  <data>
    <interfaces xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces">
      <interface>
        <name>GigabitEthernet1</name>
        <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:ethernetCsmacd</type>
        <enabled>true</enabled>
        <ipv4 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip">
          <address>
            <ip>10.1.1.1</ip>
            <netmask>255.255.255.192</netmask>
          </address>
        </ipv4>
        <ipv6 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip"/>
      </interface>
      <interface>
        <name>GigabitEthernet2</name>
        <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:ethernetCsmacd</type>
        <enabled>false</enabled>
        <ipv4 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip">
          <address>
            <ip>192.168.0.13</ip>
            <netmask>255.255.255.0</netmask>
          </address>
        </ipv4>
        <ipv6 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip"/>
      </interface>
      <interface>
        <name>GigabitEthernet3</name>
        <description>test</description>
        <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:ethernetCsmacd</type>
        <enabled>false</enabled>
        <ipv4 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip">
          <address>
            <ip>100.100.100.100</ip>
            <netmask>255.255.255.0</netmask>
          </address>
        </ipv4>
        <ipv6 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip"/>
      </interface>
      <interface>
        <name>Loopback0</name>
        <description>Just a loopback</description>
        <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:softwareLoopback</type>
        <enabled>true</enabled>
        <ipv4 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip">
          <address>
            <ip>172.1.2.3</ip>
            <netmask>255.255.255.255</netmask>
          </address>
        </ipv4>
        <ipv6 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip"/>
      </interface>
      <interface>
        <name>Loopback1000</name>
        <description>Loopback created using RESTCONF/IETF YANG</description>
        <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:softwareLoopback</type>
        <enabled>true</enabled>
        <ipv4 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip">
          <address>
            <ip>172.1.2.10</ip>
            <netmask>255.255.255.255</netmask>
          </address>
        </ipv4>
        <ipv6 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip"/>
      </interface>
      <interface>
        <name>Loopback2449</name>
        <description>Created by Dmitry Figol</description>
        <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:softwareLoopback</type>
        <enabled>true</enabled>
        <ipv4 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip"/>
        <ipv6 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip"/>
      </interface>
    </interfaces>
  </data>
</rpc-reply>



Libyang ERROR: Invalid value "ianaift:ethernetCsmacd" in "type" element. Path: '/ietf-interfaces:interfaces/interface[name='GigabitEthernet1']/type'
Traceback (most recent call last):
  File "test_ydk.py", line 22, in <module>
    main()
  File "test_ydk.py", line 19, in main
    interfaces = crud.read(provider, query)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/ydk/errors/error_handler.py", line 112, in helper
    return func(self, provider, entity, *args, **kwargs)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/ydk/services/crud_service.py", line 35, in read
    return self._crud.read(provider, read_filter)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/contextlib.py", line 99, in __exit__
    self.gen.throw(type, value, traceback)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/ydk/errors/error_handler.py", line 82, in handle_runtime_error
    _raise(_exc)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/ydk/errors/error_handler.py", line 54, in _raise
    exec("raise exc from None")
  File "<string>", line 1, in <module>
ydk.errors.YPYModelError:  Invalid value "ianaift:ethernetCsmacd" in "type" element. Path: /ietf-interfaces:interfaces/interface[name='GigabitEthernet1']/type
Disconnected from device

System Information

Python 3.6.3, macOS High Sierra, x86_64
Tested on CSR1000v running 16.6.1

➜  pip3 freeze | grep ydk
ydk==0.6.2
ydk-models-cisco-ios-xe==16.6.1.post1
ydk-models-ietf==0.1.4
ydk-models-openconfig==0.1.4

Additional details

Similar happens when openconfig_interfaces.Interfaces() is used (uncomment the line in code).
Result:

➜  python3 test_ydk.py
Path where models are to be downloaded: /Users/dmfigol/.ydk/csr-16.6-gs:830
Connected to csr-16.6-gs on port 830 using ssh with timeout of -1
Executing CRUD read operation
=============Generating payload to send to device=============
<rpc xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"><get xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <filter><interfaces xmlns="http://openconfig.net/yang/interfaces"/></filter>
</get>
</rpc>


=============Reply payload received from device=============
<?xml version="1.0" encoding="UTF-8"?>
<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="10">
  <data>
    <interfaces xmlns="http://openconfig.net/yang/interfaces">
      <interface>
        <name>GigabitEthernet1</name>
        <config>
          <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:ethernetCsmacd</type>
          <name>GigabitEthernet1</name>
          <enabled>true</enabled>
        </config>
        <state>
          <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:ethernetCsmacd</type>
          <name>GigabitEthernet1</name>
          <enabled>true</enabled>
          <ifindex>0</ifindex>
          <admin-status>UP</admin-status>
          <oper-status>UP</oper-status>
          <last-change>2017-11-12T15:14:03.000377+00:00</last-change>
          <counters>
            <in-octets>560261022</in-octets>
            <in-unicast-pkts>1110562</in-unicast-pkts>
            <in-broadcast-pkts>0</in-broadcast-pkts>
            <in-multicast-pkts>0</in-multicast-pkts>
            <in-discards>0</in-discards>
            <in-errors>0</in-errors>
            <in-unknown-protos>0</in-unknown-protos>
            <out-octets>77804785</out-octets>
            <out-unicast-pkts>1254467</out-unicast-pkts>
            <out-broadcast-pkts>0</out-broadcast-pkts>
            <out-multicast-pkts>0</out-multicast-pkts>
            <out-discards>0</out-discards>
            <out-errors>0</out-errors>
            <last-clear>2017-11-12T15:08:04.000153+00:00</last-clear>
          </counters>
        </state>
        <subinterfaces>
          <subinterface>
            <index>0</index>
            <config>
              <index>0</index>
              <name>GigabitEthernet1</name>
              <enabled>true</enabled>
            </config>
            <state>
              <index>0</index>
              <name>GigabitEthernet1.0</name>
              <enabled>true</enabled>
              <admin-status>UP</admin-status>
              <oper-status>UP</oper-status>
              <last-change>2017-11-12T15:14:03.000377+00:00</last-change>
              <counters>
                <in-octets>560261022</in-octets>
                <in-unicast-pkts>1110562</in-unicast-pkts>
                <in-broadcast-pkts>0</in-broadcast-pkts>
                <in-multicast-pkts>0</in-multicast-pkts>
                <in-discards>0</in-discards>
                <in-errors>0</in-errors>
                <out-octets>77804785</out-octets>
                <out-unicast-pkts>1254467</out-unicast-pkts>
                <out-broadcast-pkts>0</out-broadcast-pkts>
                <out-multicast-pkts>0</out-multicast-pkts>
                <out-discards>0</out-discards>
                <out-errors>0</out-errors>
                <last-clear>2017-11-12T15:08:04.000153+00:00</last-clear>
              </counters>
            </state>
            <ipv4 xmlns="http://openconfig.net/yang/interfaces/ip">
              <addresses>
                <address>
                  <ip>10.1.1.1</ip>
                  <config>
                    <ip>10.1.1.1.</ip>
                    <prefix-length>26</prefix-length>
                  </config>
                  <state>
                    <ip>10.1.1.1</ip>
                    <prefix-length>26</prefix-length>
                  </state>
                </address>
              </addresses>
            </ipv4>
            <ipv6 xmlns="http://openconfig.net/yang/interfaces/ip">
              <config>
                <enabled>false</enabled>
              </config>
              <state>
                <enabled>false</enabled>
              </state>
            </ipv6>
          </subinterface>
        </subinterfaces>
        <ethernet xmlns="http://openconfig.net/yang/interfaces/ethernet">
          <config>
            <auto-negotiate>true</auto-negotiate>
          </config>
        </ethernet>
      </interface>
      <interface>
        <name>GigabitEthernet2</name>
        <config>
          <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:ethernetCsmacd</type>
          <name>GigabitEthernet2</name>
          <enabled>false</enabled>
        </config>
        <state>
          <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:ethernetCsmacd</type>
          <name>GigabitEthernet2</name>
          <enabled>false</enabled>
          <ifindex>0</ifindex>
          <admin-status>DOWN</admin-status>
          <oper-status>DOWN</oper-status>
          <last-change>2017-11-12T15:14:14.000902+00:00</last-change>
          <counters>
            <in-octets>82225</in-octets>
            <in-unicast-pkts>1032</in-unicast-pkts>
            <in-broadcast-pkts>0</in-broadcast-pkts>
            <in-multicast-pkts>0</in-multicast-pkts>
            <in-discards>0</in-discards>
            <in-errors>69840</in-errors>
            <in-unknown-protos>0</in-unknown-protos>
            <out-octets>0</out-octets>
            <out-unicast-pkts>0</out-unicast-pkts>
            <out-broadcast-pkts>0</out-broadcast-pkts>
            <out-multicast-pkts>0</out-multicast-pkts>
            <out-discards>0</out-discards>
            <out-errors>0</out-errors>
            <last-clear>2017-11-12T15:08:03.000821+00:00</last-clear>
          </counters>
        </state>
        <subinterfaces>
          <subinterface>
            <index>0</index>
            <config>
              <index>0</index>
              <name>GigabitEthernet2</name>
              <enabled>false</enabled>
            </config>
            <state>
              <index>0</index>
              <name>GigabitEthernet2.0</name>
              <enabled>false</enabled>
              <admin-status>DOWN</admin-status>
              <oper-status>DOWN</oper-status>
              <last-change>2017-11-12T15:14:14.000902+00:00</last-change>
              <counters>
                <in-octets>82225</in-octets>
                <in-unicast-pkts>1032</in-unicast-pkts>
                <in-broadcast-pkts>0</in-broadcast-pkts>
                <in-multicast-pkts>0</in-multicast-pkts>
                <in-discards>0</in-discards>
                <in-errors>69840</in-errors>
                <out-octets>0</out-octets>
                <out-unicast-pkts>0</out-unicast-pkts>
                <out-broadcast-pkts>0</out-broadcast-pkts>
                <out-multicast-pkts>0</out-multicast-pkts>
                <out-discards>0</out-discards>
                <out-errors>0</out-errors>
                <last-clear>2017-11-12T15:08:03.000821+00:00</last-clear>
              </counters>
            </state>
            <ipv4 xmlns="http://openconfig.net/yang/interfaces/ip">
              <addresses>
                <address>
                  <ip>192.168.0.13</ip>
                  <config>
                    <ip>192.168.0.13</ip>
                    <prefix-length>24</prefix-length>
                  </config>
                  <state>
                    <ip>192.168.0.13</ip>
                    <prefix-length>24</prefix-length>
                  </state>
                </address>
              </addresses>
            </ipv4>
            <ipv6 xmlns="http://openconfig.net/yang/interfaces/ip">
              <config>
                <enabled>false</enabled>
              </config>
              <state>
                <enabled>false</enabled>
              </state>
            </ipv6>
          </subinterface>
        </subinterfaces>
        <ethernet xmlns="http://openconfig.net/yang/interfaces/ethernet">
          <config>
            <auto-negotiate>true</auto-negotiate>
          </config>
        </ethernet>
      </interface>
      <interface>
        <name>GigabitEthernet3</name>
        <config>
          <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:ethernetCsmacd</type>
          <name>GigabitEthernet3</name>
          <description>test</description>
          <enabled>false</enabled>
        </config>
        <state>
          <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:ethernetCsmacd</type>
          <name>GigabitEthernet3</name>
          <description>test</description>
          <enabled>false</enabled>
          <ifindex>0</ifindex>
          <admin-status>DOWN</admin-status>
          <oper-status>DOWN</oper-status>
          <last-change>2017-11-12T15:14:14.000927+00:00</last-change>
          <counters>
            <in-octets>25838</in-octets>
            <in-unicast-pkts>353</in-unicast-pkts>
            <in-broadcast-pkts>0</in-broadcast-pkts>
            <in-multicast-pkts>0</in-multicast-pkts>
            <in-discards>0</in-discards>
            <in-errors>0</in-errors>
            <in-unknown-protos>0</in-unknown-protos>
            <out-octets>0</out-octets>
            <out-unicast-pkts>0</out-unicast-pkts>
            <out-broadcast-pkts>0</out-broadcast-pkts>
            <out-multicast-pkts>0</out-multicast-pkts>
            <out-discards>0</out-discards>
            <out-errors>0</out-errors>
            <last-clear>2017-11-12T15:08:03.000855+00:00</last-clear>
          </counters>
        </state>
        <subinterfaces>
          <subinterface>
            <index>0</index>
            <config>
              <index>0</index>
              <name>GigabitEthernet3</name>
              <description>test</description>
              <enabled>false</enabled>
            </config>
            <state>
              <index>0</index>
              <name>GigabitEthernet3.0</name>
              <description>test</description>
              <enabled>false</enabled>
              <admin-status>DOWN</admin-status>
              <oper-status>DOWN</oper-status>
              <last-change>2017-11-12T15:14:14.000927+00:00</last-change>
              <counters>
                <in-octets>25838</in-octets>
                <in-unicast-pkts>353</in-unicast-pkts>
                <in-broadcast-pkts>0</in-broadcast-pkts>
                <in-multicast-pkts>0</in-multicast-pkts>
                <in-discards>0</in-discards>
                <in-errors>0</in-errors>
                <out-octets>0</out-octets>
                <out-unicast-pkts>0</out-unicast-pkts>
                <out-broadcast-pkts>0</out-broadcast-pkts>
                <out-multicast-pkts>0</out-multicast-pkts>
                <out-discards>0</out-discards>
                <out-errors>0</out-errors>
                <last-clear>2017-11-12T15:08:03.000855+00:00</last-clear>
              </counters>
            </state>
            <ipv4 xmlns="http://openconfig.net/yang/interfaces/ip">
              <addresses>
                <address>
                  <ip>100.100.100.100</ip>
                  <config>
                    <ip>100.100.100.100</ip>
                    <prefix-length>24</prefix-length>
                  </config>
                  <state>
                    <ip>100.100.100.100</ip>
                    <prefix-length>24</prefix-length>
                  </state>
                </address>
              </addresses>
            </ipv4>
            <ipv6 xmlns="http://openconfig.net/yang/interfaces/ip">
              <config>
                <enabled>false</enabled>
              </config>
              <state>
                <enabled>false</enabled>
              </state>
            </ipv6>
          </subinterface>
        </subinterfaces>
        <ethernet xmlns="http://openconfig.net/yang/interfaces/ethernet">
          <config>
            <auto-negotiate>true</auto-negotiate>
          </config>
        </ethernet>
      </interface>
      <interface>
        <name>Loopback0</name>
        <config>
          <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:softwareLoopback</type>
          <name>Loopback0</name>
          <description>Just a loopback</description>
          <enabled>true</enabled>
        </config>
        <state>
          <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:softwareLoopback</type>
          <name>Loopback0</name>
          <description>Just a loopback</description>
          <enabled>true</enabled>
          <ifindex>0</ifindex>
          <admin-status>UP</admin-status>
          <oper-status>UP</oper-status>
          <last-change>2017-11-12T15:14:10.000754+00:00</last-change>
          <counters>
            <in-octets>0</in-octets>
            <in-unicast-pkts>0</in-unicast-pkts>
            <in-broadcast-pkts>0</in-broadcast-pkts>
            <in-multicast-pkts>0</in-multicast-pkts>
            <in-discards>0</in-discards>
            <in-errors>0</in-errors>
            <in-unknown-protos>0</in-unknown-protos>
            <out-octets>0</out-octets>
            <out-unicast-pkts>0</out-unicast-pkts>
            <out-broadcast-pkts>0</out-broadcast-pkts>
            <out-multicast-pkts>0</out-multicast-pkts>
            <out-discards>0</out-discards>
            <out-errors>0</out-errors>
            <last-clear>2017-11-12T15:08:03.000349+00:00</last-clear>
          </counters>
        </state>
        <subinterfaces>
          <subinterface>
            <index>0</index>
            <config>
              <index>0</index>
              <name>Loopback0</name>
              <description>Just a loopback</description>
              <enabled>true</enabled>
            </config>
            <state>
              <index>0</index>
              <name>Loopback0.0</name>
              <description>Just a loopback</description>
              <enabled>true</enabled>
              <admin-status>UP</admin-status>
              <oper-status>UP</oper-status>
              <last-change>2017-11-12T15:14:10.000754+00:00</last-change>
              <counters>
                <in-octets>0</in-octets>
                <in-unicast-pkts>0</in-unicast-pkts>
                <in-broadcast-pkts>0</in-broadcast-pkts>
                <in-multicast-pkts>0</in-multicast-pkts>
                <in-discards>0</in-discards>
                <in-errors>0</in-errors>
                <out-octets>0</out-octets>
                <out-unicast-pkts>0</out-unicast-pkts>
                <out-broadcast-pkts>0</out-broadcast-pkts>
                <out-multicast-pkts>0</out-multicast-pkts>
                <out-discards>0</out-discards>
                <out-errors>0</out-errors>
                <last-clear>2017-11-12T15:08:03.000349+00:00</last-clear>
              </counters>
            </state>
            <ipv4 xmlns="http://openconfig.net/yang/interfaces/ip">
              <addresses>
                <address>
                  <ip>172.1.2.3</ip>
                  <config>
                    <ip>172.1.2.3</ip>
                    <prefix-length>32</prefix-length>
                  </config>
                  <state>
                    <ip>172.1.2.3</ip>
                    <prefix-length>32</prefix-length>
                  </state>
                </address>
              </addresses>
            </ipv4>
            <ipv6 xmlns="http://openconfig.net/yang/interfaces/ip">
              <config>
                <enabled>false</enabled>
              </config>
              <state>
                <enabled>false</enabled>
              </state>
            </ipv6>
          </subinterface>
        </subinterfaces>
      </interface>
      <interface>
        <name>Loopback1000</name>
        <config>
          <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:softwareLoopback</type>
          <name>Loopback1000</name>
          <description>Loopback created using RESTCONF/IETF YANG</description>
          <enabled>true</enabled>
        </config>
        <state>
          <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:softwareLoopback</type>
          <name>Loopback1000</name>
          <description>Loopback created using RESTCONF/IETF YANG</description>
          <enabled>true</enabled>
          <ifindex>0</ifindex>
          <admin-status>UP</admin-status>
          <oper-status>UP</oper-status>
          <last-change>2017-11-12T15:14:11.000219+00:00</last-change>
          <counters>
            <in-octets>0</in-octets>
            <in-unicast-pkts>0</in-unicast-pkts>
            <in-broadcast-pkts>0</in-broadcast-pkts>
            <in-multicast-pkts>0</in-multicast-pkts>
            <in-discards>0</in-discards>
            <in-errors>0</in-errors>
            <in-unknown-protos>0</in-unknown-protos>
            <out-octets>0</out-octets>
            <out-unicast-pkts>0</out-unicast-pkts>
            <out-broadcast-pkts>0</out-broadcast-pkts>
            <out-multicast-pkts>0</out-multicast-pkts>
            <out-discards>0</out-discards>
            <out-errors>0</out-errors>
            <last-clear>2017-11-12T15:08:03.000699+00:00</last-clear>
          </counters>
        </state>
        <subinterfaces>
          <subinterface>
            <index>0</index>
            <config>
              <index>0</index>
              <name>Loopback1000</name>
              <description>Loopback created using RESTCONF/IETF YANG</description>
              <enabled>true</enabled>
            </config>
            <state>
              <index>0</index>
              <name>Loopback1000.0</name>
              <description>Loopback created using RESTCONF/IETF YANG</description>
              <enabled>true</enabled>
              <admin-status>UP</admin-status>
              <oper-status>UP</oper-status>
              <last-change>2017-11-12T15:14:11.000219+00:00</last-change>
              <counters>
                <in-octets>0</in-octets>
                <in-unicast-pkts>0</in-unicast-pkts>
                <in-broadcast-pkts>0</in-broadcast-pkts>
                <in-multicast-pkts>0</in-multicast-pkts>
                <in-discards>0</in-discards>
                <in-errors>0</in-errors>
                <out-octets>0</out-octets>
                <out-unicast-pkts>0</out-unicast-pkts>
                <out-broadcast-pkts>0</out-broadcast-pkts>
                <out-multicast-pkts>0</out-multicast-pkts>
                <out-discards>0</out-discards>
                <out-errors>0</out-errors>
                <last-clear>2017-11-12T15:08:03.000699+00:00</last-clear>
              </counters>
            </state>
            <ipv4 xmlns="http://openconfig.net/yang/interfaces/ip">
              <addresses>
                <address>
                  <ip>172.1.2.10</ip>
                  <config>
                    <ip>172.1.2.10</ip>
                    <prefix-length>32</prefix-length>
                  </config>
                  <state>
                    <ip>172.1.2.10</ip>
                    <prefix-length>32</prefix-length>
                  </state>
                </address>
              </addresses>
            </ipv4>
            <ipv6 xmlns="http://openconfig.net/yang/interfaces/ip">
              <config>
                <enabled>false</enabled>
              </config>
              <state>
                <enabled>false</enabled>
              </state>
            </ipv6>
          </subinterface>
        </subinterfaces>
      </interface>
      <interface>
        <name>Loopback2449</name>
        <config>
          <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:softwareLoopback</type>
          <name>Loopback2449</name>
          <description>Created by Dmitry Figol</description>
          <enabled>true</enabled>
        </config>
        <state>
          <type xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">ianaift:softwareLoopback</type>
          <name>Loopback2449</name>
          <description>Created by Dmitry Figol</description>
          <enabled>true</enabled>
          <ifindex>0</ifindex>
          <admin-status>UP</admin-status>
          <oper-status>UP</oper-status>
          <last-change>2017-11-12T15:14:11.00009+00:00</last-change>
          <counters>
            <in-octets>0</in-octets>
            <in-unicast-pkts>0</in-unicast-pkts>
            <in-broadcast-pkts>0</in-broadcast-pkts>
            <in-multicast-pkts>0</in-multicast-pkts>
            <in-discards>0</in-discards>
            <in-errors>0</in-errors>
            <in-unknown-protos>0</in-unknown-protos>
            <out-octets>0</out-octets>
            <out-unicast-pkts>0</out-unicast-pkts>
            <out-broadcast-pkts>0</out-broadcast-pkts>
            <out-multicast-pkts>0</out-multicast-pkts>
            <out-discards>0</out-discards>
            <out-errors>0</out-errors>
            <last-clear>2017-11-12T15:08:03.000434+00:00</last-clear>
          </counters>
        </state>
        <subinterfaces>
          <subinterface>
            <index>0</index>
            <config>
              <index>0</index>
              <name>Loopback2449</name>
              <description>Created by Dmitry Figol</description>
              <enabled>true</enabled>
            </config>
            <state>
              <index>0</index>
              <name>Loopback2449.0</name>
              <description>Created by Dmitry Figol</description>
              <enabled>true</enabled>
              <admin-status>UP</admin-status>
              <oper-status>UP</oper-status>
              <last-change>2017-11-12T15:14:11.00009+00:00</last-change>
              <counters>
                <in-octets>0</in-octets>
                <in-unicast-pkts>0</in-unicast-pkts>
                <in-broadcast-pkts>0</in-broadcast-pkts>
                <in-multicast-pkts>0</in-multicast-pkts>
                <in-discards>0</in-discards>
                <in-errors>0</in-errors>
                <out-octets>0</out-octets>
                <out-unicast-pkts>0</out-unicast-pkts>
                <out-broadcast-pkts>0</out-broadcast-pkts>
                <out-multicast-pkts>0</out-multicast-pkts>
                <out-discards>0</out-discards>
                <out-errors>0</out-errors>
                <last-clear>2017-11-12T15:08:03.000434+00:00</last-clear>
              </counters>
            </state>
            <ipv6 xmlns="http://openconfig.net/yang/interfaces/ip">
              <config>
                <enabled>false</enabled>
              </config>
              <state>
                <enabled>false</enabled>
              </state>
            </ipv6>
          </subinterface>
        </subinterfaces>
      </interface>
    </interfaces>
  </data>
</rpc-reply>



Libyang ERROR: Failed to resolve augment "/openconfig-interfaces:interfaces/openconfig-interfaces:interface/openconfig-if-ethernet:ethernet/openconfig-if-ethernet:state". Path: '/openconfig-if-aggregate:/openconfig-interfaces:interfaces/openconfig-interfaces:interface/openconfig-if-ethernet:ethernet/openconfig-if-ethernet:state'
Traceback (most recent call last):
  File "test_ydk.py", line 25, in <module>
    main()
  File "test_ydk.py", line 22, in main
    interfaces = crud.read(provider, query)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/ydk/errors/error_handler.py", line 112, in helper
    return func(self, provider, entity, *args, **kwargs)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/ydk/services/crud_service.py", line 35, in read
    return self._crud.read(provider, read_filter)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/contextlib.py", line 99, in __exit__
    self.gen.throw(type, value, traceback)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/ydk/errors/error_handler.py", line 82, in handle_runtime_error
    _raise(_exc)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/ydk/errors/error_handler.py", line 54, in _raise
    exec("raise exc from None")
  File "<string>", line 1, in <module>
ydk.errors.YPYModelError:  Failed to resolve augment "/openconfig-interfaces:interfaces/openconfig-interfaces:interface/openconfig-if-ethernet:ethernet/openconfig-if-ethernet:state". Path: /openconfig-if-aggregate:/openconfig-interfaces:interfaces/openconfig-interfaces:interface/openconfig-if-ethernet:ethernet/openconfig-if-ethernet:state
Disconnected from device

[nahun]

I have the same issue on different hardware and versions:

Python 2.7.12, Ubuntu 16.04
Tested on ASR1002-X running 16.7.1

$ pip freeze | grep ydk
ydk==0.7.0
ydk-models-cisco-ios-xe==16.7.1
ydk-models-ietf==0.1.4
ydk-models-openconfig==0.1.4