Unable to trace Cables when single Interfaces are connected across multiple Circuits #1189

New Issue

MrUnknownDE · 2026-04-05T21:40:17+02:00

MrUnknownDE commented

2026-04-05 21:40:17 +02:00

Originally created by @craized on 9/25/2025

NetBox Edition

NetBox Community

NetBox Version

v4.4.1

Python Version

3.10

Steps to Reproduce

I created this setup in the NetBox demo instance in case anyone has a chance to look before it gets blown out. I'm just linking the originating interfaces since everything else is very easy to find from a cable trace

https://demo.netbox.dev/dcim/interfaces/2493/
https://demo.netbox.dev/dcim/interfaces/2438/

Create two Sites, SITEA and SITEB
Create two Devices, device1.sitea and device1.siteb (Example QFX5100-48T
Create two Circuits, SPAN1-SITEA-TX and SPAN1-SITEA-RX
Create Circuit Termination at SITEA and SITEB on each Circuit
Connect device1.sitea interface et-0/0/48 to Circuit Termination "A" for both Circuit SPAN1-SITEA-TX and SPAN1-SITEA-RX by
- Selecting two Circuits, SPAN1-SITEA-TX and SPAN1-SITEA-RX
- Selecting two Sides, SPAN1-SITEA-TX: Termination A and SPAN1-SITEA-RX: Termination A
Connect device1.siteb interface et-0/0/48 to Circuit Termination "Z" for both Circuit SPAN1-SITEA-TX and SPAN1-SITEA-RX by
- Selecting two Circuits, SPAN1-SITEA-TX and SPAN1-SITEA-RX
- Selecting two Sides, SPAN1-SITEA-TX: Termination B and SPAN1-SITEA-RX: Termination B
Attempt to trace interface

Expected Behavior

A cable trace that goes from one interface, splits to both Circuit Termination Zs, then collapses from both Circuit Termination As to the far end interface

Observed Behavior

Path split! is detected between the Circuit and Termination Zs

Initial trace:

Remaining trace after a split node is selected

*Originally created by @craized on 9/25/2025* ### NetBox Edition NetBox Community ### NetBox Version v4.4.1 ### Python Version 3.10 ### Steps to Reproduce I created this setup in the NetBox demo instance in case anyone has a chance to look before it gets blown out. I'm just linking the originating interfaces since everything else is very easy to find from a cable trace https://demo.netbox.dev/dcim/interfaces/2493/ https://demo.netbox.dev/dcim/interfaces/2438/ 1. Create two Sites, SITEA and SITEB 2. Create two Devices, device1.sitea and device1.siteb (Example QFX5100-48T 3. Create two Circuits, SPAN1-SITEA-TX and SPAN1-SITEA-RX 4. Create Circuit Termination at SITEA and SITEB on each Circuit 5. Connect device1.sitea interface et-0/0/48 to Circuit Termination "A" for both Circuit SPAN1-SITEA-TX and SPAN1-SITEA-RX by - Selecting two Circuits, SPAN1-SITEA-TX and SPAN1-SITEA-RX - Selecting two Sides, SPAN1-SITEA-TX: Termination A and SPAN1-SITEA-RX: Termination A 6. Connect device1.siteb interface et-0/0/48 to Circuit Termination "Z" for both Circuit SPAN1-SITEA-TX and SPAN1-SITEA-RX by - Selecting two Circuits, SPAN1-SITEA-TX and SPAN1-SITEA-RX - Selecting two Sides, SPAN1-SITEA-TX: Termination B and SPAN1-SITEA-RX: Termination B 7. Attempt to trace interface ### Expected Behavior A cable trace that goes from one interface, splits to both Circuit Termination Zs, then collapses from both Circuit Termination As to the far end interface ### Observed Behavior Path split! is detected between the Circuit and Termination Zs Initial trace: <img width="528" height="665" alt="Image" src="https://github.com/user-attachments/assets/e9d2a102-5d22-4792-88cd-0c6c53911d21" /> Remaining trace after a split node is selected <img width="684" height="659" alt="Image" src="https://github.com/user-attachments/assets/1d02bdb0-71f2-48d5-9947-214eac0b9123" />

MrUnknownDE closed this issue

2026-04-05 21:40:17 +02:00

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status: accepted status: accepted status: accepted status: accepted status: accepted status: accepted status: accepted status: accepted status: accepted status: accepted status: accepted status: accepted status: accepted status: accepted status: accepted status: accepted status: accepted status: accepted topic: cabling topic: cabling topic: cabling topic: cabling type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug type: bug 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Reference: github/netbox#1189