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Trace does not work between two rear ports, and not between interface -> front port -> rear port #5385

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opened 2025-12-29 19:27:22 +01:00 by adam · 1 comment
adam commented 2025-12-29 19:27:22 +01:00
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Originally created by @sliddjur on GitHub (Sep 17, 2021).

NetBox version

v3.0.2 from netbox-docker.

Python version

3.8

Steps to Reproduce

I am trying to document my WDM cabling.

Steps to reproduce:
Create two devices, both with;

  • 1 rear port, 9 positions
  • 9 front ports mapped to the rear positions

Connect a cable between the two rear ports.
Go to device, rear ports and press trace

I am given this error message:
rearports

Now, if I add another device, create a few interfaces.

  • Connect one interface to one front port on the device recently created
    Go to interfaces, and press trace,
    I am given this trace, which shows me nothing.
    int-front-rear

Expected Behavior

I expected to see trace

both on the rear port only

and also on
interface -> frontport -> rearport -> rearport

Observed Behavior

Server Error
There was a problem with your request. Please contact an administrator.

The complete exception is provided below:

<class 'AttributeError'>

'NoneType' object has no attribute 'origin'

Python version: 3.9.5
NetBox version: 3.0.2
Originally created by @sliddjur on GitHub (Sep 17, 2021). ### NetBox version v3.0.2 from netbox-docker. ### Python version 3.8 ### Steps to Reproduce I am trying to document my WDM cabling. Steps to reproduce: Create two devices, both with; - 1 rear port, 9 positions - 9 front ports mapped to the rear positions Connect a cable between the two rear ports. Go to device, rear ports and press trace I am given this error message: ![rearports](https://user-images.githubusercontent.com/10002057/133789810-814a300a-5c4e-4c69-9bed-3e5baaa8f599.png) Now, if I add another device, create a few interfaces. - Connect one interface to one front port on the device recently created Go to interfaces, and press trace, I am given this trace, which shows me nothing. ![int-front-rear](https://user-images.githubusercontent.com/10002057/133790229-1e8a2bf0-e0ba-4452-a2c7-d0690ee66391.png) ### Expected Behavior I expected to see trace both on the rear port only and also on interface -> frontport -> rearport -> rearport ### Observed Behavior ``` Server Error There was a problem with your request. Please contact an administrator. The complete exception is provided below: <class 'AttributeError'> 'NoneType' object has no attribute 'origin' Python version: 3.9.5 NetBox version: 3.0.2 ```
adam added the type: bugstatus: duplicate labels 2025-12-29 19:27:22 +01:00
adam closed this issue 2025-12-29 19:27:22 +01:00
adam commented 2025-12-29 19:27:23 +01:00
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@jeremystretch commented on GitHub (Sep 17, 2021):

Thank you for submitting this issue, however it appears that this topic has already been raised. Please see issue #7279 for further discussion.

@jeremystretch commented on GitHub (Sep 17, 2021): Thank you for submitting this issue, however it appears that this topic has already been raised. Please see issue #7279 for further discussion.
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Reference: starred/netbox#5385
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