topic Re: Netconf error in IOS-XE 17.3.1a but works fine on IOS-XE 16.12.4: bad-element: config in Tools

Netconf error in IOS-XE 17.3.1a but works fine on IOS-XE 16.12.4: bad-element: config

mark — Sun, 23 Aug 2020 01:33:38 GMT

Hi all,

I'm just starting my Netconf/Yang journey. I figured I'd start small - setting the hostname of a CSR1kv. The following works fine on IOS-XE 16.12.4:

#!/usr/bin/env python3

from ncclient import manager

config_snippet = """
<config>
   <native xmlns="http://cisco.com/ns/yang/Cisco-IOS-XE-native">
      <hostname>AAAROUTERAAA</hostname>
   </native>
</config>
"""

with manager.connect(host="<private ip>", port=830, username="<netconf username>",
                     hostkey_verify=False, device_params={'name': 'csr'}) as m:
    result = m.edit_config(target='running', config=config_snippet)
    print(result.xml)

As expected, the above changes the router hostname. (Auth is being done through SSH keys.)

I'm spinning up the CSR1kv image using a short script. All I change is the IOS image to a different version (the base config is loaded during the automated spin-up). And yet on IOS-XE 17.3.1a when I run the script above I get the following error (reformatted for clarity):

<?xml version="1.0" encoding="UTF-8"?>
<error-info xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0">
  <bad-element>config</bad-element>
</error-info>

I've compared the output from "show netconf schema" on the two versions and they are identical (running 'diff' between the two returns nothing).

It feels like I'm missing something obvious.

There's not much in the "config" section that could have a bad element. Hostname is still represented the same way, in the same place:

(well, slight difference with '{}' vs ';', but I think that should be fine; please correct me if I'm wrong.)

Does anyone have any suggestions as to what I should be looking for?

Thanks,

mark

Re: Netconf error in IOS-XE 17.3.1a but works fine on IOS-XE 16.12.4: bad-element: config

yangorelik — Mon, 24 Aug 2020 16:21:19 GMT

Have you tried change snippet like this:

config_snippet = """
<native xmlns="http://cisco.com/ns/yang/Cisco-IOS-XE-native">
  <hostname>AAAROUTERAAA</hostname>
</native>
"""

Re: Netconf error in IOS-XE 17.3.1a but works fine on IOS-XE 16.12.4: bad-element: config

mark — Mon, 24 Aug 2020 18:24:10 GMT

Unfortunately, no.

raise XMLError("Element [%s] does not meet requirement" % ele.tag) ncclient.xml_.XMLError: Element [{http://cisco.com/ns/yang/Cisco-IOS-XE-native}native] does not meet requirement

It seems to require the <config></config> structure.

Re: Netconf error in IOS-XE 17.3.1a but works fine on IOS-XE 16.12.4: bad-element: config

0_Kiss — Fri, 04 Sep 2020 16:00:01 GMT

Hi Mark

Seems like I'm having the same issue with a WLC98k running 17.3.1:

https://community.cisco.com/t5/mobility-discussions/wlc98k-configure-ap-tags-through-netconf/td-p/4146361

Have you been able to find a solution?

Oli

Re: Netconf error in IOS-XE 17.3.1a but works fine on IOS-XE 16.12.4: bad-element: config

mark — Fri, 04 Sep 2020 16:07:31 GMT

No. I've tested the same config against earlier versions and the earlier versions work just fine. This is only broken in 17.3.1. My only suggestion is to roll-back the version number and test again.

I've setup an alert so that I'll be notified when a new version of the CSR1000v is released. When it comes out I'll be testing it immediately.

Re: Netconf error in IOS-XE 17.3.1a but works fine on IOS-XE 16.12.4: bad-element: config

0_Kiss — Mon, 07 Sep 2020 12:56:33 GMT

Thanks Mark! I have now made the same observation, my scripts run fine on a WLC with version 16.12.4a. Strange!

Re: Netconf error in IOS-XE 17.3.1a but works fine on IOS-XE 16.12.4: bad-element: config

mashrafi — Sat, 10 Oct 2020 15:15:35 GMT

try this one it works:

config_snippet = """

<hostname>AAAROUTERAAA</hostname>

</native>

</config>

"""

Re: Netconf error in IOS-XE 17.3.1a but works fine on IOS-XE 16.12.4: bad-element: config

mark — Mon, 12 Oct 2020 21:13:52 GMT

How did you figure out those namespace definitions were required?

Your solution works, but now I'm having a similar problem with the <cli-config-data> instruction.

Re: Netconf error in IOS-XE 17.3.1a but works fine on IOS-XE 16.12.4:

profhamachi — Sun, 09 Jan 2022 04:56:22 GMT

Thank you @mashrafi for helping to point us in the right direction! Created a YouTube video here demonstrating how to fix NETCONF scripts in v17 IOS XE based on your post.

profhamachi