Redispatch failing due to no data being present

Hello,

This used to work before I upgrade from version 3.4.0 to version 4.1.1

Not sure why it is failing on the juniper device:

#Use the redispatch method (to switch the Netmiko class to a Juniper)
    redispatch(net_connect, device_type='juniper_junos')
    
    net_connect.send_command('cli', expect_string=r'>')
    
    output = net_connect.send_command('show configuration | display set')
    
    if f'vcsr-{domain}' in output:
        print(f'Found vcsr-{domain}')
        print(f'>>> Deleting vcsr-{domain} instance')
        net_connect.send_config_set(f'delete virtual-machines instance vcsr-{domain}',\
             exit_config_mode = False)
        output = net_connect.commit(and_quit=True)
        
        if 'commit complete' in output:
            print(output)
            print(Fore.LIGHTGREEN_EX + 'Success!')
        else:
            print(Fore.RED + f'Could not delete vcsr-{domain} instance')
            net_connect.disconnect()
            quit()
    else:
        print(f'No vcsr-{domain} instance running')
    
    net_connect.send_command('exit', expect_string=r'#')

Output:

Checking if any vnf are running: vcsr-a Traceback (most recent call last): File “./CSR1000V_License_Stage.py”, line 1467, in <module> check_vnf_running() File “./CSR1000V_License_Stage.py”, line 275, in check_vnf_running redispatch(net_connect, device_type=‘juniper_junos’) File “/usr/local/lib/python3.8/site-packages/netmiko/ssh_dispatcher.py”, line 449, in redispatch obj._try_session_preparation() File “/usr/local/lib/python3.8/site-packages/netmiko/base_connection.py”, line 879, in _try_session_preparation self.session_preparation() File “/usr/local/lib/python3.8/site-packages/netmiko/juniper/juniper.py”, line 20, in session_preparation self._test_channel_read(pattern=pattern) File “/usr/local/lib/python3.8/site-packages/netmiko/base_connection.py”, line 1119, in _test_channel_read return self.read_until_pattern(pattern=pattern, read_timeout=20) File “/usr/local/lib/python3.8/site-packages/netmiko/base_connection.py”, line 651, in read_until_pattern raise ReadTimeout(msg) netmiko.exceptions.ReadTimeout:

Pattern not detected: ‘[%>$#]’ in output.

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.

Log file shows this:

DEBUG:netmiko:read_channel: root@ptr53-jdm:~# DEBUG:netmiko:Pattern found: ([$#]) Last login: Tue Jul 19 00:36:24 2022 from fd:192:168:53::250 root@ptr53-jdm:~# DEBUG:netmiko:read_channel: DEBUG:netmiko:Clear buffer detects data in the channel DEBUG:netmiko:read_channel: DEBUG:netmiko:write_channel: b’\n’ DEBUG:netmiko:read_channel: DEBUG:netmiko:read_channel: root@ptr53-jdm:~# DEBUG:netmiko:Pattern found: ([$#]) root@ptr53-jdm:~# DEBUG:netmiko:read_channel: DEBUG:netmiko:Clear buffer detects data in the channel DEBUG:netmiko:read_channel: DEBUG:netmiko:[find_prompt()]: prompt is root@ptr53-jdm:~# DEBUG:netmiko:read_channel: DEBUG:netmiko:write_channel: b’\n’ DEBUG:netmiko:read_channel: DEBUG:netmiko:read_channel: root@ptr53-jdm:~# DEBUG:netmiko:Pattern found: ([$#]) root@ptr53-jdm:~# DEBUG:netmiko:read_channel: DEBUG:netmiko:Clear buffer detects data in the channel DEBUG:netmiko:read_channel: DEBUG:netmiko:[find_prompt()]: prompt is root@ptr53-jdm:~# DEBUG:netmiko:read_channel: DEBUG:netmiko:read_channel: DEBUG:netmiko:read_channel: DEBUG:netmiko:read_channel: DEBUG:netmiko:read_channel: DEBUG:netmiko:read_channel: DEBUG:netmiko:read_channel: DEBUG:netmiko:read_channel: DEBUG:netmiko:read_channel: DEBUG:netmiko:read_channel: DEBUG:netmiko:read_channel: … … … …

I also tried commenting this line, but same issue: #net_connect.send_command('cli', expect_string=r'>')

[assadniang]

@ktbyers

Finally got it working…

Thank you!!!

The reason I had it set to linux initially, is I wanted to run some linux command at the shell when I am not doing junos config changes

Output:

>>> Connecting to uCPE: ptr53-jdm
root@ptr53-jdm>
Successfully connected to uCPE

>>> Checking if any vnf are running: vcsr-a
set virtual-machines instance vcsr-a descriptor-file-name /var/third-party/vcsr_a.xml

Found vcsr-a
>>> Deleting vcsr-a instance
commit and-quit 
commit complete
Exiting configuration mode

{master:0}
root@ptr53-jdm> 
Success!


>>> Deleting QCOW2 files in /images_a folder
cd /var/third-party/images_a
root@ptr53-jdm:/var/third-party/images_a# rm csr1000v*
root@ptr53-jdm:/var/third-party/images_a# 

>>> Creating xml file: vcsr_a.xml
Verifying vcsr_a.xml file is created
Success!
root@ptr53-jdm:/var/third-party# 
Successfully created vcsr_a.xml

Code:

############# MTLAB-AUTO SSH Parameters
ssh_juniper_ucpe = {
    'device_type': 'juniper_junos',
    'host': target_host,
    'username': 'root',
    'password': 'juniper123',
}

#Use the redispatch method (to switch the Netmiko class to a Juniper)
    #redispatch(net_connect, device_type='juniper_junos')
    
    #net_connect.send_command('cli', expect_string=r'>')    
    
    output = net_connect.send_command('show configuration | display set | match vcsr')
    print(output)

    if f'vcsr-{domain}' in output:
        print(f'Found vcsr-{domain}')
        print(f'>>> Deleting vcsr-{domain} instance')
        net_connect.send_config_set(f'delete virtual-machines instance vcsr-{domain}',\
             exit_config_mode = False)
        output = net_connect.commit(and_quit=True)
        
        if 'commit complete' in output:
            print(output)
            print(Fore.LIGHTGREEN_EX + 'Success!')
        else:
            print(Fore.RED + f'Could not delete vcsr-{domain} instance')
            net_connect.disconnect()
            quit()
    else:
        print(f'No vcsr-{domain} instance running')

[ktbyers]

@assadniang Okay, I merged that pull-request into the Netmiko develop branch.