CRC Error check Script

The following script checks the CRC status of routers and switches to notify the system administrator via email in case there is CRC error on an interfaces.
In order to make it easier and more efficient to connect to routers and switches, we have created a file in YAML format that contains equipment information, IP, username and password, and IOS type, here is the YAML file:

Testbed:
 name: alwaysonsbxs
                           
  credentials:
    default:
        username: "admin"
        password: "ipcafe"
        enable: "ipcafe"
                       
 devices:
      csr1000v-1:
          type: router
          os: iosxe
          connections:
              ssh:
                  protocol: ssh 
                  ip: 192.168.1.200
                                  
      csr1000v-2:
          type: router
          os: iosxe
          connections:
              ssh:
                  protocol: ssh 
                  ip: 192.168.1.201 

First, we send the CLI commands to the routers using the Genie library, and we receive the result in JSON format. We also use the smtpli and email libraries to send emails.

from genie.conf import Genie
import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText

Using the “for” loop, we connect to the devices which we specified in the testbed file, then we send the show interfaces command.
For more information about the genie library and what it supports -> https://pubhub.devnetcloud.com/media/genie-feature-browser/docs/#/

for device in testbed.devices:
    testbed.devices[device].connect()
    interface_details=testbed.devices[device].parse("show interfaces")
    device_verstions[device]=verstion
    device_interface_details[device]=interface_details 

Converting the received results to our desired format by the help of 2 “for” loops, we define a condition to check the interfaces with crc error then we send the results to the sendmail function.

for device,interfaces in device_interface_details.items():
    for interface, details in interfaces.items():
        if details["counters"]["in_crc_errors"]==0:
            continue
        else:
            sendmail(crc= details["counters"]["in_crc_errors"],interface=interface,device=device)  

We send the email through an independent function as follows:

def sendmail(crc,interface,device):
  from_addr='ipcafe@gmail.com'
  to_addr='info@ipcafe.net'
  msg=MIMEMultipart()
  msg['From']=from_addr
  msg['To']=",".join(to_addr)
  msg['Subject']=f'{device}--Interface CRC Error'
  body=f"device: {device} on{interface} have {crc} CRC Error"
  msg.attach(MIMEText(body,'plain'))
  smtp_server=smtplib.SMTP('smtp.gmail.com',587)
  smtp_server.starttls()
  smtp_server.login(''ipcafe@gmail.com”,”password”)
  text=msg.as_string()
  smtp_server.sendmail(from_addr,to_addr,text)
  smtp_server.quit() 

• Note: If you use gmail to send email in the script, you must first log in to the sender’s gmail account , then click on this url
  https://www.google.com/settings/security/lesssecureapps and enable less secure applications option
• you can use cron job for scheduling the script.

   

you can download the application source code and YAML file: Download   
Password:ipcafe.net