Not Paths Found on cable tracing of Rear Ports with Modules

[jonatangobbato]

NetBox version

v3.4.5

Python version

3.9

Steps to Reproduce

1. Create a device A (Switch) and add some Interface SFP+
2. Create a device B (Fiber Patch Panel) and add a Module with 12 Front ports (LC [1-12]) and 12 Rear Ports (SC [1-12])
3. Create a device C (Fiber Patch Panel) and add a Module with 12 Front ports (LC [1-12]) and 12 Rear Ports (SC [1-12])
4. Create a device D (Switch) and add some Interface SFP+
5. Connect interface of Device A to 2 front Ports Of Device B LC 1 and LC2
6. Connect the rear interfaces SC 1 and SC 2 of Device B to the rear interfaces SC 1 and SC 2 of the Device C
7. Connect SFP+ interface of Device D to the front interfaces LC 1 and LC 2 of the device C.

Expected Behavior

When click on cable trace of the interface SFP+ of the device A, show the entire trace of the cable to the Device D, including the fiber patch panels on the way.

Observed Behavior

When click on the cable trace of Device A interface, only the trace to the device B are show, and a "Path split!" Warning appears and ask to select what nodes have to continue. When i click on one node, a page with the "No paths found" appears.

[jonatangobbato]

Update.
IF no Module on device B and dedvice C, the trace works fine.

[DanSheps]

This might be fixed with #13337 (#11079), I will test when I have time

[arthanson]

@DanSheps were you able to test if this was fixed?

[arthanson]

@jonatangobbato would you be able to test this with NetBox v3.6.3? I think it is probably fixed

[DanSheps]

This should be fixed, but let me test it out.

I think the big thing is going to be you shouldn't be using multi-position rear ports with multi-plex cables as we have no easy/clean way of telling which cable which rear port should connect to. You should instead use a single cable for each rear port (typically rear ports will be your plant fiber, if you are using multi-position ports, that is your "buffer" (12 fibers strands bundled). If you think of a 244, you would have:

• 288 strands total
• 24 buffers (Buffer tube really, Blue, Green, ... Blue-1, Green-1, etc)
• 12 strands per buffer

Rear ports, with 12 positions, should be a single cable that is your "buffer". You shouldn't try and connect 2 "buffers" to 2 rear-ports.

[DanSheps]

Tried 2 different ways:

https://demo.netbox.dev/dcim/interfaces/3079/trace/

https://demo.netbox.dev/dcim/interfaces/3080/trace/

I would say 100% fixed