Network Interface Configuration Examples

Example 1: Configure Interface

Script: `Configure.py`

import argparse
from netmiko import ConnectHandler
import yaml
from jinja2 import Environment, FileSystemLoader

def load_yaml(file_path):
    with open(file_path, 'r') as file:
        return yaml.safe_load(file)

def render_template(template_path, data):
    env = Environment(loader=FileSystemLoader('.'))
    template = env.get_template(template_path)
    return template.render(data)

def configure_interface(device, config):
    with ConnectHandler(**device) as net_connect:
        output = net_connect.send_config_set(config.splitlines())
        print(output)

def main():
    parser = argparse.ArgumentParser(description="Configure an interface on a Cisco router.")
    parser.add_argument('--yaml', required=True, help="Path to the YAML configuration file.")
    parser.add_argument('--template', required=True, help="Path to the Jinja2 template file.")
    
    args = parser.parse_args()
    
    # Load YAML file
    settings = load_yaml(args.yaml)
    
    # Render Jinja2 template
    config = render_template(args.template, settings)
    
    # Configure the interface
    configure_interface(settings['device'], config)

if __name__ == "__main__":
    main()

Settings.yaml

device:
  device_type: cisco_ios
  host: 192.168.1.1
  username: admin
  password: password
  secret: secret

interface:
  name: GigabitEthernet0/1
  description: "Uplink to Core"
  ip_address: 192.168.2.1
  subnet_mask: 255.255.255.0
  state: "up"

interface_template.j2

interface {{ interface.name }}
  description {{ interface.description }}
  ip address {{ interface.ip_address }} {{ interface.subnet_mask }}
  {% if interface.state == "up" %}
  no shutdown
  {% else %}
  shutdown
  {% endif %}

Usage

python configure_interface.py --yaml settings.yaml --template interface_template.j2

Example 2: Migrate Interfaces

Script: `migrate_interfaces.py`

import argparse
from netmiko import ConnectHandler
import yaml
from jinja2 import Environment, FileSystemLoader

def load_yaml(file_path):
    with open(file_path, 'r') as file:
        return yaml.safe_load(file)

def render_template(template_path, data):
    env = Environment(loader=FileSystemLoader('.'))
    template = env.get_template(template_path)
    return template.render(data)

def get_juniper_interfaces(juniper_device):
    with ConnectHandler(**juniper_device) as net_connect:
        interfaces = net_connect.send_command("show interfaces terse", use_textfsm=True)
        return interfaces

def configure_cisco_interfaces(cisco_device, config):
    with ConnectHandler(**cisco_device) as net_connect:
        output = net_connect.send_config_set(config.splitlines())
        print(output)

def main():
    parser = argparse.ArgumentParser(description="Migrate interface configurations from Juniper to Cisco.")
    parser.add_argument('--yaml', required=True, help="Path to the YAML configuration file.")
    parser.add_argument('--template', required=True, help="Path to the Jinja2 template file.")
    
    args = parser.parse_args()
    
    # Load YAML file
    settings = load_yaml(args.yaml)
    
    # Get Juniper interfaces
    juniper_interfaces = get_juniper_interfaces(settings['juniper_device'])
    
    # Map Juniper interfaces to Cisco interfaces based on YAML settings
    interfaces_to_configure = []
    for juniper_intf in juniper_interfaces:
        if juniper_intf['interface'] in settings['interface_mapping']:
            cisco_intf = settings['interface_mapping'][juniper_intf['interface']]
            interfaces_to_configure.append({
                'name': cisco_intf,
                'description': juniper_intf['description'],
                'ip_address': juniper_intf['ip_address'],
                'subnet_mask': juniper_intf['subnet_mask'],
                'state': juniper_intf['state']
            })
    
    # Render Jinja2 template
    config = render_template(args.template, {'interfaces': interfaces_to_configure})
    
    # Configure Cisco interfaces
    configure_cisco_interfaces(settings['cisco_device'], config)

if __name__ == "__main__":
    main()

Settings.yaml

juniper_device:
  device_type: juniper_junos
  host: 192.168.1.2
  username: admin
  password: password

cisco_device:
  device_type: cisco_ios
  host: 192.168.1.1
  username: admin
  password: password
  secret: secret

interface_mapping:
  ge-0/0/0: GigabitEthernet0/1
  ge-0/0/1: GigabitEthernet0/2
  ge-0/0/2: GigabitEthernet0/3

interface_template.j2

{% for interface in interfaces %}
interface {{ interface.name }}
  description {{ interface.description }}
  ip address {{ interface.ip_address }} {{ interface.subnet_mask }}
  {% if interface.state == "up" %}
  no shutdown
  {% else %}
  shutdown
  {% endif %}
{% endfor %}

Usage

python migrate_interfaces.py --yaml settings.yaml --template interface_template.j2

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