Python Script:- Telnet to cisco device
import telnetlib
import time
host = '10.10.10.1'
port = '23'
user = 'cisco'
password = 'cisco'
tn = telnetlib.Telnet(host=host, port=port)
tn.read_until(b'Username: ')
tn.write(user.encode() + b'\n')
tn.read_until(b'Password: ')
tn.write(password.encode() + b'\n')
tn.write(b'show ip int brie \n')
tn.write(b'exit \n')
time.sleep(1)
Output
This is a simple python script to backup the config of your cisco device, with date and time into a txt file
import paramiko
import time
from datetime import datetime
ssh_client = paramiko.SSHClient()
ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
router = {'hostname': '10.10.10.1', 'port': '22', 'username':'cisco', 'password':'cisco'}
print(f'Connecting to Device...{router["hostname"]}')
ssh_client.connect(**router, look_for_keys=False, allow_agent=False)
shell = ssh_client.invoke_shell()
shell.send('terminal length 0\n')
shell.send('enable\n')
shell.send('cisco\n')
shell.send('show run\n')
time.sleep(2)
output = shell.recv(10000).decode()
print(output)
now = datetime.now()
year = now.year
month = now.month
day = now.day
hour = now.hour
minute = now.minute
file_name = f'{router["hostname"]}-{year}-{month}-{day}-{hour}-{minute}.txt'
with open(file_name, 'w') as f:
f.write(output)
print('Closing Connection')
ssh_client.close()
Script for basic ospf configuration
gns3 Topology
import paramiko
import time
import getpass
from pip._vendor.distlib.compat import raw_input
ssh_client = paramiko.SSHClient()
ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
username = raw_input('Enter username:')
password = getpass.getpass('Enter Password:')
router = {'hostname': '10.10.10.1', 'port': '22', 'username': username, 'password': password}
print(f'Connecting to Device...{router["hostname"]}')
ssh_client.connect(**router, look_for_keys=False, allow_agent=False)
shell = ssh_client.invoke_shell()
shell.send('enable\n')
shell.send('cisco\n')
shell.send('conf t\n')
shell.send('router ospf 10\n')
shell.send('net 0.0.0.0 0.0.0.0 area 0\n')
shell.send('end\n')
shell.send('show ip protocols\n')
time.sleep(2)
output = shell.recv(10000).decode()
print(output)
print('Closing Connection')
ssh_client.close()
Output post execution of the Script
Topology is in gns3 loopback interface is configured on the desktop to connect the router
import paramiko
import time
import getpass
from pip._vendor.distlib.compat import raw_input
ssh_client = paramiko.SSHClient()
ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
username = raw_input('Enter Username:')
password = getpass.getpass('Enter Password:')
router = {'hostname': '10.10.10.1', 'port': '22', 'username':username, 'password':password}
print(f'Connecting to Device....{router["hostname"]}')
ssh_client.connect(**router, look_for_keys=False, allow_agent=False)
shell = ssh_client.invoke_shell()
shell.send('show ip int brie\n')
time.sleep(1)
output = shell.recv(10000)
output = output.decode()
print(output)
print('Closing Connection')
ssh_client.close()
c:>python sshconnect.py
Below is the output of the command executed
VRF-Lite Configuration With IPSec
