topic Re: Netconf to retrieve ospf configuration using Python in Tools

Netconf to retrieve ospf configuration using Python

sqambera — Mon, 06 Dec 2021 04:30:34 GMT

Hello,

I wrote following code to fetch ospf configuration from the CSR router but not able to obtain it. Please see the output. Can anyone please help me know what's wrong?

from xml.dom import minidom
from ncclient import manager

m = manager.connect(host = "10.10.20.48",
                     port = 830,
                     username = "developer",
                     password = "C1sco12345",
                     hostkey_verify = False)

print(m.connected)


filter_routing = """
<filter>
<ospf xmlns="http://cisco.com/ns/yang/Cisco-IOS-XE-ospf">
</ospf>
</filter>
"""
running = m.get_config("running", filter_routing)
running_xml = minidom.parseString(running.xml)
print(running_xml.toprettyxml(indent = "  "))


OUTPUT:

C:\Users\Image\PycharmProjects\Netconf\venv\Scripts\python.exe C:/Users/Image/PycharmProjects/Netconf/Routing.py
True
<?xml version="1.0" ?>
<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="urn:uuid:902cbaa2-aea3-4e00-b19a-2278007b50f0">
<data/>
</rpc-reply>


The actual ospf configuration on router is following:

csr1000v-1#sh run | section ospf
router ospf 1
network 172.16.24.0 0.0.0.255 area 0


Attached is the XML output of running configuration.

Thanks,
Qamber

Re: Netconf to retrieve ospf configuration using Python

Alexander Stevenson — Mon, 06 Dec 2021 17:10:05 GMT

Hello @sqambera,

You are on the right track! Cisco Code Exchange will help you complete the task. I searched there for “ospf, yang, netconf”:

Cisco Code Exchange

Examples found therein:

NC-get-config.py - This script retrieves entire configuration from a network element via NETCONF
get_config_csr1000V.py - Get configured interfaces using Netconf
ncclinet/nc02.py - Retrieve the running config from the NETCONF server

Of course, you will need to adjust your code, including filtering results for ospf.

Re: Netconf to retrieve ospf configuration using Python

bigevilbeard — Mon, 06 Dec 2021 17:33:33 GMT

You could also use the native model

        rpc = '''
                <config>
                    <native xmlns="http://cisco.com/ns/yang/Cisco-IOS-XE-native">
                        <router>
                            <ospf xmlns="http://cisco.com/ns/yang/Cisco-IOS-XE-ospf">
                            </ospf>
                        </router>
                    </native>
                </config>
            '''

Re: Netconf to retrieve ospf configuration using Python

fracjackmac — Mon, 06 Dec 2021 19:46:58 GMT

Hello @sqambera,

I'm running IOS-XR, so things may be different, but I was able to run the following command on the router to determine the available OSPF namespaces

show netconf-yang capabilities | in ospf

show netconf-yang capabilities | in ospf
Mon Dec  6 19:25:57.698 UTC
http://cisco.com/ns/yang/Cisco-IOS-XR-ipv4-ospf-act                               |2016-09-14| 
http://cisco.com/ns/yang/Cisco-IOS-XR-ipv4-ospf-cfg                               |2018-05-14| 
http://cisco.com/ns/yang/Cisco-IOS-XR-ipv4-ospf-oper                              |2018-04-18| 
http://cisco.com/ns/yang/Cisco-IOS-XR-ipv6-ospfv3-act                             |2016-09-14| 
http://cisco.com/ns/yang/Cisco-IOS-XR-ipv6-ospfv3-cfg                             |2018-05-14| 
http://cisco.com/ns/yang/Cisco-IOS-XR-ipv6-ospfv3-oper                            |2018-06-15|

After a bit of trial and error, I found that I could produce useful output with the following filter:

filter_routing = """
<filter>            
<ospf xmlns="http://cisco.com/ns/yang/Cisco-IOS-XR-ipv4-ospf-cfg">
</ospf>  
</filter>
"""

The following is a portion of the output:

>>> print(running_xml.toprettyxml(indent = "  "))
<?xml version="1.0" ?>
<rpc-reply xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="urn:uuid:f7d22dbd-db09-43b1-b0e9-c43909a359f4">
  
 
  <data>
    
  
    <ospf xmlns="http://cisco.com/ns/yang/Cisco-IOS-XR-ipv4-ospf-cfg">
      
   
      <processes>
        
    
        <process>
          
     
          <process-name>10</process-name>
          
     
          <nsr>true</nsr>
          
     
          <default-vrf>
            
      
            <adjacency-changes>detail</adjacency-changes>

Hope this helps!!!

fjm

@ittybittypacket

Re: Netconf to retrieve ospf configuration using Python

fracjackmac — Mon, 06 Dec 2021 19:51:22 GMT

Hello@sqambera,

By the way, THANKS for your post!!

This gave me an opportunity to actually take the leap and start exploring netconf in the lab. 🙂

fjm

@ittybittypacket

Re: Netconf to retrieve ospf configuration using Python

sqambera — Tue, 07 Dec 2021 04:10:36 GMT

Thank you