Monday, August 27, 2012

Cisco Nexus 3K with Python - Part 1

Not sure if it is a well-known fact, but Cisco's Nexus 3K switch platform supports running Python scripts for a few months now.

Here is the API doc:
Cisco Nexus 3000 Switch 5.0(3)U3(2) Python API

The biggest difference between a traditional Python environment is that you need to import a Cisco module in order to execute CLI commands from Python, as well as take advantage of some of the built-in methods.

Nexus-3064# python
Python 2.7.2 (default, Mar  6 2012, 15:51:12)
[GCC 3.4.3 (MontaVista 3.4.3- 2008-02-22)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
Loaded cisco NxOS lib!
>>> import cisco
>>> dir(cisco)
['BufferDepthMonitor', 'CLI', 'CheckPortDiscards', 'FTPTransfer', 'HTTPTransfer', 'History', 'Interface', 'Key', 'LineParser', 'PasswordProtoTransfer', 'Routes', 'SCPTransfer', 'SFTPTransfer', 'SectionParser', 'TFTPTransfer', 'Transfer', '__builtins__', '__doc__', '__file__', '__name__', '__package__', '_bcm_sdk_shell', '_cisco', '_get_cli_output', '_get_merged_cli_output', '_get_op_prompt_pat', '_get_status_from_prompt', '_merge', '_op_prmpt_re', 'cfg_if', 'cli', 'commands', 'copy', 'datetime', 'deque', 'get_valid_port', 'os', 'pexpect', 're', 'show_queues', 'show_run', 'sys', 'transfer']
>>> cisco.cli('show hostname')
(0, 'Nexus-3064 \n')
>>> output = cisco.cli('show hostname')
>>> output[1]
'Nexus-3064 \n'
>>> output[1].strip()
>>> exit()

The word on the street is that this at least will stay in the future roadmap for Nexus platforms.

1 comment:

  1. can I use python to generate custom syslog messages in N-3064?
    i tried EEM but it doesnt have watchdog timer's like IOS.