Friday, August 24, 2018

Python Scripts to Reboot / Manage Cisco Network Devices

Basically I am creating a script to build SSH connection from my Windows 7 network management computer to Cisco devices and have interactive commands with those Cisco devices. This has been done by many other network engineer. With Google's help, I am able to get their experiences to quickly implement it in my home lab environment.

It will be part of network management automation task. If
I can get this working it will prevent me from having to sign on to all of my Cisco devices and issue the command manually. Previously I used  network automation tool InfoBlox NetMRI to achieve that. Now with Python script, it can be achieved almost with a very low cost.

Step 1. Install Python and necessary components on my Windows 7 Machine.
I had a post before to describe the steps how to install Python and related module into windows system.
  • Test with the following command:
    • import paramiko




Step 2. Create a Script




C:\Python27>type cisco.py
import paramiko
from getpass import getpass
import time
import datetime
import sys

ip = "192.168.2.5"
username = "Cisco"
password = "Cisco"

f = open('1Reboot-APlog.txt', 'a')
old_stdout = sys.stdout
sys.stdout = f
remote_conn_pre=paramiko.SSHClient()
remote_conn_pre.set_missing_host_key_policy(paramiko.AutoAddPolicy())
remote_conn_pre.connect(ip, port=22, username=username,  
                        password=password,
                        look_for_keys=False, allow_agent=False)

remote_conn = remote_conn_pre.invoke_shell()
output = remote_conn.recv(65535)
print('\n\n\n##############################################################\n')
print (datetime.datetime.now())
print('\n##############################################################\n')
print (output)

remote_conn.send("enable\n")
time.sleep(.5)
output = remote_conn.recv(65535)
print (output)

remote_conn.send("Cisco\n")
time.sleep(.5)
output = remote_conn.recv(65535)
print (output)

remote_conn.send("reload\n")
time.sleep(.5)
output = remote_conn.recv(65535)
print (output)


remote_conn.send("y\n")
time.sleep(.5)
output = remote_conn.recv(65535)
print (output)



C:\Python27>python cisco.py
C:\Python27>type Newdaytest.txt
############################################################## 2018-08-24 12:38:42.178000 ############################################################## **************************************************************** * This is a private computing facility. * * Unauthorized use of this device is strictly prohibited. * * Violators will be prosecuted to the maximum extent possible. * * * * TACACS+ Authentication and Accounting are in place. * * All actions/commands are monitored and recorded. * * By using the network you expressly consent to such * * monitoring and recording. * **************************************************************** SW-FW-MGMT1#config t Enter configuration commands, one per line. End with CNTL/Z. SW-FW-MGMT1(config)# file prompt quiet SW-FW-MGMT1(config)# end SW-FW-MGMT1# copy running-config tftp://192.168.154.5/ . . .

3. Schedule Daily Reboot Task in Windows 
Create a new daily task to run following command:
c:\Python27\python.exe c:\Python27\1reboot-ap.py





4. Check Logs
Check log file 1Reboot-APlog.txt created under c:\Python27

##############################################################
2018-08-24 15:06:29.151000
##############################################################


1142>
enable
Password: 

1142#
reload
Proceed with reload? [confirm]


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