Network Management

I have some strange behavior in Python. I created a Python script to get VLAN information from a 2930F switch. The script is very basic:

1. Collect admin credentials
2. Log in and get the cookie
3. Perform Python requests to get VLANs
4. Print JSON output
5. Log off

I added the script as an attachment. I have 3 2930F switches with similar configuration. The script gets the VLANs for 1 of the 3 switches. Only a VLAN GET doesn't work on the 2 switches. As soon as I change to GET url to, for example: get_vlan = requests.get(url + vlans-ports, headers=headers, verify=False, timeout=2) the script works. I can change vlans-ports for many other variables, like system, lldp or whatever, they all work. Only vlans doesn't work.

I don't get any useful information from a debug rest-interface on the switch. Visual Studio Code gives me some output, that you can find below. 

Strange thing for me is that the switches have the same config, same firmware version.

Traceback (most recent call last):
  File "C:\Program Files\Python37\lib\site-packages\urllib3\response.py", line 360, in _error_catcher
    yield
  File "C:\Program Files\Python37\lib\site-packages\urllib3\response.py", line 685, in read_chunked
    line = self._fp.fp.readline()
  File "C:\Program Files\Python37\lib\socket.py", line 589, in readinto
    return self._sock.recv_into(b)
  File "C:\Program Files\Python37\lib\ssl.py", line 1052, in recv_into
    return self.read(nbytes, buffer)
  File "C:\Program Files\Python37\lib\ssl.py", line 911, in read
    return self._sslobj.read(len, buffer)
socket.timeout: The read operation timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Program Files\Python37\lib\site-packages\requests\models.py", line 750, in generate
    for chunk in self.raw.stream(chunk_size, decode_content=True):
  File "C:\Program Files\Python37\lib\site-packages\urllib3\response.py", line 490, in stream
    for line in self.read_chunked(amt, decode_content=decode_content):
  File "C:\Program Files\Python37\lib\site-packages\urllib3\response.py", line 694, in read_chunked
    self._original_response.close()
  File "C:\Program Files\Python37\lib\contextlib.py", line 130, in __exit__
    self.gen.throw(type, value, traceback)
  File "C:\Program Files\Python37\lib\site-packages\urllib3\response.py", line 365, in _error_catcher
    raise ReadTimeoutError(self._pool, None, 'Read timed out.')
urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='10.10.1.2', port=443): Read timed out.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "d:/cloudstation/github/hpe-aos-cli/vlan_add.py", line 80, in <module>
    get_vlan = requests.get(url + 'vlans', headers=headers, verify=False, timeout=2)
  File "C:\Program Files\Python37\lib\site-packages\requests\api.py", line 75, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Program Files\Python37\lib\site-packages\requests\api.py", line 60, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Program Files\Python37\lib\site-packages\requests\sessions.py", line 533, in request
    resp = self.send(prep, **send_kwargs)
  File "C:\Program Files\Python37\lib\site-packages\requests\sessions.py", line 686, in send
    r.content
  File "C:\Program Files\Python37\lib\site-packages\requests\models.py", line 828, in content
    self._content = b''.join(self.iter_content(CONTENT_CHUNK_SIZE)) or b''
  File "C:\Program Files\Python37\lib\site-packages\requests\models.py", line 757, in generate
    raise ConnectionError(e)
requests.exceptions.ConnectionError: HTTPSConnectionPool(host='10.10.1.2', port=443): Read timed out.

Attachment(s)

vlan_add.pdf   59 KB 1 version

I found the solutions by changing the API version from 3 to 4.

Thanks to Herman Robers and Dik van Oeveren from HPE Aruba.