Parse Cisco SSH commands using Python: RegEx Parser Part 5/9: Configuration Parsing

Published: 01 April 2021
on channel: NetworkEvolution

2,204

#RegexExample #RegexPython #ParseSSH

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Script
-------
import paramiko
import time
from getpass import getpass
import re

version_pattern = re.compile(r'Cisco .+ Software, Version (\S+)')
model_pattern = re.compile(r'cisco (\S+).+bytes of memory\.')
serial_no_pattern = re.compile(r'Processor board ID (\S+)')
uptime_pattern = re.compile(r'(.+) uptime is (.*)')

lab_csr = {
'host': 'csr1.test.lab',
'username': 'admin',
'password': 'admin'
}
devnet_csr = {
'host': 'ios-xe-mgmt-latest.cisco.com',
'username': 'developer',
'password': 'C1sco12345'
}

def cisco_parse_version(host,username,password):
try:
print(f"\n{'#' * 55}\nConnecting to the Device {host}\n{'#' * 55} ")
SESSION = paramiko.SSHClient()
SESSION.set_missing_host_key_policy(paramiko.AutoAddPolicy())
SESSION.connect(host, port=22,
username=username,
password=password,
look_for_keys=False,
allow_agent=False)

DEVICE_ACCESS = SESSION.invoke_shell()
DEVICE_ACCESS.send(b'term length 0\n')
DEVICE_ACCESS.send(b'show ver\n')
time.sleep(1)
output = (DEVICE_ACCESS.recv(65000).decode('ascii'))

version_match = version_pattern.search(output)
print('IOS Version'.ljust(18)+': '+version_match.group(1))

model_match = model_pattern.search(output)
print('Model '.ljust(18)+': '+model_match.group(1))

serial_no_match = serial_no_pattern.search(output)
print('Serial Number '.ljust(18)+': '+serial_no_match.group(1))

uptime_match = uptime_pattern.search(output)
print('Host Name '.ljust(18)+': '+uptime_match.group(1))
print('Device Uptime '.ljust(18)+': '+uptime_match.group(2))

print(f"\n{'#' * 55}\nFinished Executing Script\n{'#' * 55} ")
SESSION.close()

except paramiko.ssh_exception.AuthenticationException:
print("Authentication Failed")
except AttributeError:
print("Parsing Error, Please check the command")
except:
print("Can not connect to Device")
cisco_parse_version(**devnet_csr)
--------------------

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This Video demonstrates how to parse Cisco show command output

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