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Unable to assign Child Interfaces to the Parent LAG #5249

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opened 2025-12-29 19:25:52 +01:00 by adam · 1 comment
adam commented 2025-12-29 19:25:52 +01:00
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Originally created by @Daniel-Dietz on GitHub (Aug 30, 2021).

NetBox version

v3.0.0

Python version

3.8

Steps to Reproduce

1 Create a (Parent)Device with minimum two Device Bays
2 Create two (Child) Devices, with each at least one Interface
3 Add Parent to Rack and add Childs to Device Bay
4 Create LAG Interface in Parent
5 Try to add Child-Interfaces to LAG

Expected Behavior

To be able to add the Child Interfaces to the Parent LAG

This is a required function for example fully modular Switches, as the Parent does not have any interfaces on its one. LAGs are not limited to one Child-Module, but for redundancy are split between two or more Modules.

Observed Behavior

The Parent LAG is not available to be selected

Originally created by @Daniel-Dietz on GitHub (Aug 30, 2021). ### NetBox version v3.0.0 ### Python version 3.8 ### Steps to Reproduce 1 Create a (Parent)Device with minimum two Device Bays 2 Create two (Child) Devices, with each at least one Interface 3 Add Parent to Rack and add Childs to Device Bay 4 Create LAG Interface in Parent 5 Try to add Child-Interfaces to LAG ### Expected Behavior To be able to add the Child Interfaces to the Parent LAG This is a required function for example fully modular Switches, as the Parent does not have any interfaces on its one. LAGs are not limited to one Child-Module, but for redundancy are split between two or more Modules. ### Observed Behavior The Parent LAG is not available to be selected
adam closed this issue 2025-12-29 19:25:52 +01:00
adam commented 2025-12-29 19:25:53 +01:00
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@jeremystretch commented on GitHub (Aug 30, 2021):

LAG membership cannot span multiple devices. All member interfaces must exist on the same device. (Child devices do not share a control plane.)

@jeremystretch commented on GitHub (Aug 30, 2021): LAG membership cannot span multiple devices. All member interfaces must exist on the same device. (Child devices do not share a control plane.)
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Reference: starred/netbox#5249
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