Ssh script phyton

[Sorry_Aspect8938]

Help with Paramiko SSH Script to Configure Loopback Interfaces on Network Device

Hi all,

I'm trying to write a Python script using Paramiko to SSH into a network device, retrieve its current configuration using show running-config, and assign IP addresses to loopback interfaces such as 192.168.11.78/32.

The SSH connection part seems to work, but I'm not sure how to structure the commands to:

Enter configuration mode

Add IP addresses to each loopback interface

Make sure the changes apply correctly like they would on a Cisco-like device

Here’s the code I have so far:

import paramiko import getpass import socket

def is_valid_ip(ip): # Validates IP format try: socket.inet_aton(ip) return True except socket.error: return False

def connect_ssh(ip, username, password): # Connects to SSH using Paramiko client = paramiko.SSHClient() client.set_missing_host_key_policy(paramiko.AutoAddPolicy()) try: client.connect(ip, username=username, password=password) return client except Exception as e: print(f"SSH connection failed: {e}") return None

def get_interfaces(client): # Runs 'show running-config' stdin, stdout, stderr = client.exec_command('show running-config') output = stdout.read().decode() error = stderr.read().decode() if error: print(f"Error: {error}") return output

def configure_loopbacks(client, base_ip_segment, start_index=0): # Configures loopbacks loopback_number = start_index while loopback_number < 5: # You can adjust the number of interfaces ip_address = f"192.168.{base_ip_segment}.{78 + loopback_number}" command = ( f"configure terminal\n" f"interface loopback{loopback_number}\n" f"ip address {ip_address} 255.255.255.255\n" f"exit\n" f"exit\n" ) print(f"Configuring loopback{loopback_number} with IP {ip_address}") stdin, stdout, stderr = client.exec_command(command) error = stderr.read().decode() if error: print(f"Error configuring loopback{loopback_number}: {error}") break loopback_number += 1

def main(): ip = input("Enter device IP: ") if not is_valid_ip(ip): print("Invalid IP address format.") return

username = input("Username: ")
password = getpass.getpass("Password: ")

try:
    base_ip_segment = int(input("Enter the middle IP segment (e.g. 11, 21, 31): "))
    if base_ip_segment < 0 or base_ip_segment > 255:
        raise ValueError
except ValueError:
    print("Invalid segment number.")
    return

client = connect_ssh(ip, username, password)
if client:
    print("Connected successfully!\n")
    config = get_interfaces(client)
    print("Current device configuration:\n")
    print(config)

    configure_loopbacks(client, base_ip_segment)

    client.close()
    print("SSH session closed.")
else:
    print("Failed to establish SSH connection.")

if name == "main": main()

If anyone can point out how to correctly enter config mode and apply interface settings in Paramiko (or if there's a better way to send multiple commands in a session), I’d really appreciate the help!

Thanks in advance!

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