XR BGP Operational

[mufaddal.presswala]

Trying to encode the BGP operational object returned from a XRv device but it fails with the below YPYModelError

ydk.errors.YPYModelError:  Invalid path: af-data : Failed to resolve uses "DEFAULT-VRF".. Path: /Cisco-IOS-XR-ipv4-bgp-oper:bgp/instances/instance/instance-standby/DEFAULT-VRF
Disconnected from device

The crud.read operation is successful as evident from the ydk.logs (attached).

I am using Yfilter.read to read the full BGP neighbor table in the Cisco_IOS_XR_ipv4_bgp_oper class.

Encode works fine when i read the neighbor object partially by simply reading the neighbor-address or other neighbor properties. Output omitted for brevity.

I have also attached the python snippet for retrieving the neighbor table.

{
  "Cisco-IOS-XR-ipv4-bgp-oper:bgp": {
    "instances": {
      "instance": [
        {
          "instance-name": "default",
          "instance-active": {
            "default-vrf": {
              "afs": {
                "af": [
                  {
                    "af-name": "ipv4-unicast",
                    "neighbor-af-table": {
                      "neighbor": [
                        {
                          "neighbor-address": "172.16.17.7",
                          "connection-state": "bgp-st-estab"
                        },
                        {
                          "neighbor-address": "172.16.18.8",
                          "connection-state": "bgp-st-active"
                        },
                        {
                          "neighbor-address": "192.168.0.6",
                          "connection-state": "bgp-st-estab"
                        }
                      ]
                    }
                  }
                ]
              }
            }
          }
        }
      ]
    }
  }
}

[abhirame]

Hi Mufaddal,

Can you please let me know your ydk version (output of 'pip list|grep ydk') & XR version?

Thanks

[mufaddal.presswala]

Sure, the XRv version is 6.1.2

ydk (0.6.3)
ydk-models-cisco-ios-xr (6.3.1)
ydk-models-ietf (0.1.4)

[abhirame]

Thanks, Mufaddal. I think the issue maybe because:

1. the CRUD read is working because CRUD service connects to the 6.1.2 device and downloads the models. CRUD uses the device models for processing the data
2. but CODEC is not working, because it is not based on the device models. Instead it is using the models from the ydk-models-cisco-ios-xr python package which is 6.3.1. The models are by default downloaded by CRUD in the directory '<your-home-dir>/.ydk/<your-device-hostname:port>'. So, you could point the CODEC service to these models. Please try the below step to provide the Repository() object pointing to the models from the device:

from ydk.path import Repository

repo = Repository('<your-home-dir>/.ydk/<your-device-hostname:port>')

codec_provider = CodecServiceProvider(repo=repo, type='json')
codec = CodecService()

print(codec.encode(codec_provider, bgp_obj, pretty=True))

[mufaddal.presswala]

Never noticed the .ydk directory in my home dir.

Receiving the same error with the above changes.

Invalid path: af-data
Traceback (most recent call last):
  File "lib/bgp/oper.py", line 47, in <module>
    print(codec.encode(codec_provider, bgp_obj, pretty=True))
  File "/home/ubuntu/.virtualenvs/ydk-py/lib/python3.5/site-packages/ydk/errors/error_handler.py", line 112, in helper
    return func(self, provider, entity, *args, **kwargs)
  File "/home/ubuntu/.virtualenvs/ydk-py/lib/python3.5/site-packages/ydk/services/codec_service.py", line 74, in encode
    return self._encode(provider, entity_holder, pretty, subtree)
  File "/home/ubuntu/.virtualenvs/ydk-py/lib/python3.5/site-packages/ydk/services/codec_service.py", line 105, in _encode
    return result
  File "/usr/lib/python3.5/contextlib.py", line 77, in __exit__
    self.gen.throw(type, value, traceback)
  File "/home/ubuntu/.virtualenvs/ydk-py/lib/python3.5/site-packages/ydk/errors/error_handler.py", line 82, in handle_runtime_error
    _raise(_exc)
  File "/home/ubuntu/.virtualenvs/ydk-py/lib/python3.5/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 path: af-data : Failed to resolve uses "DEFAULT-VRF".. Path: /Cisco-IOS-XR-ipv4-bgp-oper:bgp/instances/instance/instance-standby/DEFAULT-VRF
Disconnected from device

shell returned 1

[abhirame · Accepted solution]

This looks like a bug.. Opened an issue: XR BGP Oper error with XR 6.1.2 model · Issue #676 · CiscoDevNet/ydk-gen · GitHub

[mufaddal.presswala]

Thank you abhirame

[abhirame]

It looks like the XR 6.1.2 model has an invalid pattern using double quotes, which is causing the error you are seeing. This was fixed in the 621/631 model where it was changed to use single quote. YDK 0.7.1 cannot be used with XR 612. The issue should be fixed if you use a XR 612 or newer device after clearing the cache (rm -rf ~/.ydk). Closed the issue

https://github.com/CiscoDevNet/ydk-gen/issues/676

[abhirame]

As a workaround, you could try editing the model located in /root/.ydk/*/Cisco-IOS-XR-types.yang to change the pattern from double quote to single quote

[pmorvay]

you can use command:

for XE

sed -i "s/\"/\'/g" /root/.ydk/*/Cisco-IOS-XE-types.yang

for XR

sed -i "s/\"/\'/g" /root/.ydk/*/Cisco-IOS-XR-types.yang