Netmiko automatically detects the type of network device and executes the command

What is netmiko

netmiko is a Python library that helps you log in and operate network devices with SSH. It currently supports Cisco IOS, Juniper JunOS, Palo Alto PAN-OS, and more. Login, config mode transition, logout, etc. are abstracted as methods, and individual commands are a type of library that directly specifies commands. It is less abstract than NAPALM in this respect. It can be installed with pip intall netmiko etc.

--GitHub repository - ktbyers/netmiko: Multi-vendor library to simplify Paramiko SSH connections to network devices

Automatic detection function

In netmiko, it is usually necessary to set a parameter called device_type when creating a connection object, and in Cisco IOS it was specified as" cisco_ios ".

device_When explicitly specifying type

remote_device = {'device_type': 'cisco_ios',
                 'host': '192.168.0.254',
                 'username': 'user',
                 'password': 'passwordpassword'}

The recently released version 1.3.0 adds a feature called "SSH autodetect" that automatically detects device_type.

• Netmiko 1.3.0 Release

As far as I read auto_detect.py, the models that can be automatically detected are limited to the models originally supported by netmiko. It seems that there is, but this time I tried to check if it can detect Cisco IOS for the time being. (Almost the same as the example in the comment in the above source)

Code example

Automatic detection

from netmiko.ssh_autodetect import SSHDetect
from netmiko.ssh_dispatcher import ConnectHandler

#Parameter setting device_type is set to autodetect here
remote_device = {'device_type': 'autodetect',
                 'host': '192.168.0.254',
                 'username': 'user',
                 'password': 'passwordpassword'}

#Automatic detection
guesser = SSHDetect(**remote_device)
best_match = guesser.autodetect()

#Debug output of detection results
print("device_type: " + best_match)

#Automatically detected device_Reset type
remote_device['device_type'] = best_match
connection = ConnectHandler(**remote_device)

#Output of command execution result
print(connection.send_command('show version'))

#Disconnect
connection.disconnect()

Output example

Output example

device_type: cisco_ios ← Detected device_type

Cisco IOS Software, C181X Software (C181X-ADVENTERPRISEK9-M), Version 15.1(4)M4, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2012 by Cisco Systems, Inc.
Compiled Tue 20-Mar-12 23:34 by prod_rel_team

　　~Abbreviation~

-------------------------------------------------
Device#	  PID			SN
-------------------------------------------------
*0  	  CISCO1812-J/K9        ***********     
Configuration register is 0x2102

The auto-detection worked fine and I was able to see the show version results as well.

reference

--netmiko general tutorial - https://pynet.twb-tech.com/blog/automation/netmiko.html