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python to config cisco switches

leftlessleftless south africa
in Python

Hi,

I am having some issues writing a basic python script to configure access switches in mass.

The process I am trying to follow is –

Connect the switches to the lab network, issue IP address from a DHCP server and use auto config to load a base config (set the username, enable local login).

The python script will do the following-

Read the IP list file
Log in to the devices one by one
Update firmware (must still be completed)
Optionally load a config update file
Load a custom config file (based on device sn)
Gen new rsa key
Save config
Backs up new running config.
If I write this, one command following on the other it seems to work.

However. In order to provide more flexibility, I would prefer to write separate definitions and call these as I need them. This works to a limited extent.

The process to call the individual definitions works. The expect statements do not seem to function beyond the first definition that I call. My suspicion is that the expect telnet instance gets interrupted and do not continue to function as too as the first definition is completed.

How do I get the pexpect child statement to work on the subsequent definitions?

regards

Comments

  • leftlessleftless south africa

    def login_to_node ():

    use Telnet

    try:
    child = pexpect.spawn('telnet %s' % (host))
    child.expect('Username:')
    child.sendline(switch_username)
    child.expect('Password:')
    child.sendline(switch_telnet_password)
    child.expect('#')
    print(("Successfully Telnetted to host "), (host))
    except:
    try:
    #child.expect('>')
    child.sendline('enable')
    child.expect('Password:')
    child.sendline(switch_enable_password)
    child.expect('#')
    print(("Successfully Telneted to host "), (host), (',and enabled console'))
    except:
    print(("Failed to Telnet to host "), (host))
    return

    load custom config

    def load_custom_config():
    try:
    # get unit info
    # child = pexpect.spawn()
    child.sendline('show version | include Processor')
    child.expect('(?:Processor\sboard\sID\s)(\d|\w{11})')
    device_id = child.after[-11:]
    serial_number = device_id
    print(("This is Device-ID "), (device_id))
    print(("This is Device-SN "), (serial_number))
    config_file ='%s.cfg' % serial_number

       # copy config file to unit
   child.sendline('copy ftp: flash:')
    child.expect('[Address or name of remote host []?]')
    child.sendline(configuration_server)
    child.expect('[Source filename []?]')
   print(("Using device config file "), (config_file))
    child.sendline(config_file)
    child.expect('[Source filename []?]')
    child.sendline('temp_config.cfg')
    child.expect('#')
   print(("Successfully copied files to flash "), (host))

    # copy config to running config (replace current)
   try:
        child.sendline('copy flash:temp_config.cfg running-config')
        child.expect('[?]')
        child.sendline('running-config')
        child.expect('#')
        print(("Successfully copied files to running-config "), (host))
   except:
       print(("Failed to copy files to running-config "), (host))

    except:
    print(("Failed to copy files to flash "), (host))
    return

    generate new crypto key

    def generate_rsa_key ():
    # check current key
    # ?
    # generate new key
    try:
    # child = pexpect.spawn()
    child.sendline('crypto key generate rsa')
    child.expect('(512)')
    child.sendline(rsa_key_length)
    child.expect('#')
    print(("Successfully generated new RSA key on host "), (host))
    except:
    print(("RSA key gen failed on host "), (host))
    return

    save running config

    def save_running_config():
    try:
    #child = pexpect.spawn()
    child.expect('#')
    child.sendline('write memory')
    child.expect('[OK]')
    child.expect('#')
    print(("Successfully saved the running-config on "), (host))
    except:
    print(("Failed to save the running-config on "), (host))
    #return

    for line in host_list:
    host = line.split()[0]
    print(("Start configuration on host "), (host))
    platform =None
    hardware_model = None
    firmware = None
    flash_available = None
    device_id = None
    serial_number = None
    config_file = None

    login_to_node ()
    load_custom_config ()
    generate_rsa_key ()
    save_running_config ()

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