Request failed with code 400 Bad Request when trying to use the NetBox API to create a cable connection

[johanfransen]

Body

Hi all,

I'm unable to create a cable between two interfaces using the NetBox API. Receiving the error: pynetbox.core.query.RequestError: The request failed with code 400 Bad Request: {'all': ['Must define A and B terminations when creating a new cable.']}.

Details:

Interface A:
Device: evs-edge-1
Ethernet: Ethernet 11
ID: 1326
Interface B:
Device: evs-spine-1
Ethernet: Ethernet 1
ID: 1350

The ID's have been verified and are accessible thru the web interface.

Code:

Python
import pynetbox

Initialize the NetBox API

nb = pynetbox.api('http://10.129.201.216/', token='all long code')

Define the IDs and types for the terminations

termination_a_type = "dcim.interface"
termination_a_id = 1326 # Ethernet 11 on evs-edge-1
termination_b_type = "dcim.interface"
termination_b_id = 1350 # Ethernet 1 on evs-spine-1

try:
# Create the new cable
new_cable = nb.dcim.cables.create(
termination_a_type=termination_a_type,
termination_a_id=termination_a_id,
termination_b_type=termination_b_type,
termination_b_id=termination_b_id
)
print(f"Cable created successfully: {new_cable}")
except pynetbox.RequestError as e:
# Handle the request error
print(f"The request failed with code {e.response.status_code}: {e.error}")

NetBox release | NetBox Community v4.1.2 (2024-09-26)
Python version 3.12.6
Django version 5.0.9

Any help is welcome.

Johan

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[ca1ik]

Hi Johan,

The error you’re encountering suggests that the NetBox API requires both terminations (termination_a and termination_b) to be properly defined when creating a cable. Based on the code you’ve shared, the issue may be with the naming of the parameters or the exact structure of the create() function.

In NetBox v4.x, the parameters for creating a cable have slightly changed. The terminations need to be specified as a list of dictionaries. Here’s an updated version of your code that should work:

Updated Code:
python
Kodu kopyala
import pynetbox

Initialize the NetBox API

nb = pynetbox.api('http://10.129.201.216/', token='all long code')

Define the terminations

termination_a = {
"object_type": "dcim.interface",
"object_id": 1326 # Ethernet 11 on evs-edge-1
}
termination_b = {
"object_type": "dcim.interface",
"object_id": 1350 # Ethernet 1 on evs-spine-1
}

try:
# Create the new cable
new_cable = nb.dcim.cables.create(
terminations=[termination_a, termination_b]
)
print(f"Cable created successfully: {new_cable}")
except pynetbox.RequestError as e:
# Handle the request error
print(f"The request failed with code {e.response.status_code}: {e.error}")
Key Changes:
terminations Field: In NetBox v4.x, terminations are provided as a list of dictionaries with object_type and object_id keys.
Correct Parameter Names: Updated the structure to match the current API documentation.
Additional Notes:
Ensure your API token has sufficient permissions to create cables.
Verify that the object_type values (dcim.interface) are correct. These should match the type in your NetBox installation.
If the issue persists, you can use a tool like curl or Postman to manually test the API endpoint and ensure it’s functioning as expected.
Let me know if this resolves your issue or if you need further assistance.

Best regards

[johanfransen]

Hi,
Thanks for your answer but unfortunately it gives the same error.
I checked the values and apparently all are existing.
So if you have more hints, please let me know.
Kind regards
Johan