Interface speed field (32-bit) overflows for LAG interfaces exceeding ~2.1 Tbps #263

New Issue

MrUnknownDE · 2026-04-05T16:23:51+02:00

MrUnknownDE commented

2026-04-05 16:23:51 +02:00

Originally created by @waynespa on 3/2/2026

NetBox Edition

NetBox Community

NetBox Version

v4.5.3

Python Version

3.12

Steps to Reproduce

Have a device with a LAG interface whose aggregate bandwidth exceeds ~2.1 Tbps (e.g. 6× 400 Gbps members = 2.4 Tbps).
Attempt to set Speed on that interface via the API, e.g.:

curl -X 'PATCH' \
  'https://demo.netbox.dev/api/dcim/interfaces/' \
  -H 'accept: application/json' \
  -H 'Content-Type: application/json' \
  -H "Authorization: Token $TOKEN" \
  -d '[{"id": 5, "speed": 2400000000}]'

Expected Behavior

The speed is accepted and stored accurately.

Observed Behavior

The API returns a 400 Bad Request error:

{'speed': ['Ensure this value is less than or equal to 2147483647.']}

This is because the speed field is backed by a 32-bit signed integer (PositiveIntegerField), which has a maximum value of 2,147,483,647 Kbps (~2.1 Tbps). Any LAG with aggregate bandwidth above this threshold cannot be stored accurately.

*Originally created by @waynespa on 3/2/2026* ### NetBox Edition NetBox Community ### NetBox Version v4.5.3 ### Python Version 3.12 ### Steps to Reproduce 1. Have a device with a LAG interface whose aggregate bandwidth exceeds ~2.1 Tbps (e.g. 6× 400 Gbps members = 2.4 Tbps). 2. Attempt to set [Speed](https://netboxlabs.com/docs/netbox/models/dcim/interface/#speed) on that interface via the API, e.g.: ```shell curl -X 'PATCH' \ 'https://demo.netbox.dev/api/dcim/interfaces/' \ -H 'accept: application/json' \ -H 'Content-Type: application/json' \ -H "Authorization: Token $TOKEN" \ -d '[{"id": 5, "speed": 2400000000}]' ``` ### Expected Behavior The speed is accepted and stored accurately. ### Observed Behavior The API returns a `400 Bad Request` error: ```shell {'speed': ['Ensure this value is less than or equal to 2147483647.']} ``` This is because the `speed` field is backed by a 32-bit signed integer (`PositiveIntegerField`), which has a maximum value of **2,147,483,647 Kbps (~2.1 Tbps)**. Any LAG with aggregate bandwidth above this threshold cannot be stored accurately.

MrUnknownDE closed this issue

2026-04-05 16:23:51 +02:00

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21455-sql-indexes-audit

21357-register-model-actions

feature

20924-plugin-ui-components

21766-improve-test-coverage-for-sortable-table-columns

21157-export-template-public-models

21025-pre-render-config-contexts

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Reference: github/netbox#263