CODEWITHSUNDEEP
automationcisconetmiko
Jt.netcompute
Jt.netcompute

Reputation: 1

Netmiko send command fails

I have a script that works well to log inot a switch and grab all the interface descriptors and make a script to add 2 traps at the interface level. However when I try to store that multi-line string in a variable and send it back to the device I get errors.

import re
import netmiko

from netmiko import ConnectHandler

# Define the device information

device = {

    'device_type': 'cisco_ios',

    'ip': '10.10.10.103',

    'username': 'cisco',

    'password': 'cisco',

    'port': 22,

}

# Connect to the device

with ConnectHandler(**device) as net_connect:

 # Retrieve the interfaces
    output = net_connect.send_command('sh ip int bri')

 

    # Search to isolate interface descriptor with regex

matches = re.findall(r'^\S+', output, flags=re.M)


for i in range(len(matches)):
    matches[i] = "interface " + str(matches[i]) +  " \n snmp trap mac-notification change added  \n snmp trap mac-notification change removed\n" 
result = " ".join(matches)

conf_matches = "conf t\n" + result
print(conf_matches)

with ConnectHandler(**device) as net_connect:
    net_connect.send_command(conf_matches)

OUTPUT

conf t interface Ethernet0/0 snmp trap mac-notification change added
snmp trap mac-notification change removed interface Ethernet0/1 snmp trap mac-notification change added
snmp trap mac-notification change removed interface Ethernet0/2 snmp trap mac-notification change added
snmp trap mac-notification change removed interface Ethernet0/3 snmp trap mac-notification change added
snmp trap mac-notification change removed

Traceback (most recent call last): File "/Users/netcompute/Desktop/netmiko/main.py", line 56, in net_connect.send_command(conf_matches) File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/netmiko/utilities.py", line 592, in wrapper_decorator return func(self, *args, **kwargs) File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/netmiko/base_connection.py", line 1671, in send_command new_data = self.command_echo_read(cmd=cmd, read_timeout=10) File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/netmiko/base_connection.py", line 1396, in command_echo_read new_data = self.read_until_pattern( File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/netmiko/base_connection.py", line 672, in read_until_pattern raise ReadTimeout(msg) netmiko.exceptions.ReadTimeout:

Things you might try to fix this:

  1. Adjust the regex pattern to better identify the terminating string. Note, in many situations the pattern is automatically based on the network device's prompt.
  2. Increase the read_timeout to a larger value.

You can also look at the Netmiko session_log or debug log for more information.

ERRORS- (you can see the string gets printed perfectly but when it trys to send the string using netmiko the second time it errors.)

Above disclosed for all to read

Upvotes: 0

Views: 232

Answers (1)

AnarchistMiracle
AnarchistMiracle

Reputation: 21

Cisco devices don't take multi-line strings as input. They take a single line at a time and return output for each line. To send a group of configuration commands, you need to call send_command for individual command. Or you can use send_config_set with an iterable list of configuration commands.

net_connect.send_config_set(conf_matches.splitlines())

Upvotes: 0

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