Network monitoring using Python libraries such as PySNMP and Netmiko

Network monitoring is an important task in network engineering, and Python provides several libraries that can help automate the process. Two popular libraries for network monitoring are PySNMP and Netmiko.

PySNMP is a Python library for SNMP (Simple Network Management Protocol) which is used for managing and monitoring network devices. PySNMP provides a simple and efficient way to query SNMP-enabled devices and get information such as interface statistics, device configurations, and more. Here’s an example of how to use PySNMP to retrieve the interface statistics from a network device:

from pysnmp.hlapi import *

# Define the SNMP community string and OID for the interfaces table
community = CommunityData('public', mpModel=0)
oid = ObjectIdentity('IF-MIB', 'ifTable')

# Iterate over the interface table and print the interface statistics
for (errorIndication, errorStatus, errorIndex, varBinds) in bulkCmd(SnmpEngine(),
                    community, UdpTransportTarget(('', 161)), 0, 25,
                    oid, lexicographicMode=False):
    if errorIndication:
    elif errorStatus:
        print('%s at %s' % (errorStatus.prettyPrint(),
                            errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))
        for varBind in varBinds:
            print(' = '.join([x.prettyPrint() for x in varBind]))

Netmiko is a Python library that simplifies the process of connecting to network devices and running commands. Netmiko provides a unified interface for interacting with network devices via SSH or telnet, and supports a wide range of devices including routers, switches, and firewalls. Here’s an example of how to use Netmiko to connect to a Cisco router and retrieve the running configuration:

from netmiko import ConnectHandler

# Define the router's credentials and connection details
router = {
    'device_type': 'cisco_ios',
    'ip': '',
    'username': 'admin',
    'password': 'password',

# Connect to the router and retrieve the running configuration
with ConnectHandler(**router) as conn:
    output = conn.send_command('show running-config')

With these libraries, you can easily automate the process of monitoring network devices and retrieving important information, saving time and effort compared to manually logging into each device and retrieving data.

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