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Category: Switch

About Switch

UniFi Switch Auto-DHCP Issue: Root Cause and Stable Solution

Posted on 2025-11-052025-11-05 by Rico

Environment: USW-Lite-8-PoE (v7.2.123 / v8.x tested) | UniFi Network Controller 9.5.21 📌 1. Background In an enterprise network, a switch should operate purely at Layer 2 and never assign IP addresses.However, after upgrading UniFi Switch firmware to 8.x, the following issues appeared: This behavior is particularly common on USW-Lite 8 PoE and USW-Flex Mini models…

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UniFi Switch 自動啟用 DHCP 的問題分析與解決實錄

Posted on 2025-11-052025-11-05 by Rico

設備環境:USW-Lite-8-PoE(v7.2.123、v8.x 測試) / UniFi Network Controller 9.5.21 📌 一、問題背景 在企業網路環境中,Switch 一般僅作為二層設備,不應主動發放 DHCP 位址。然而,在升級 UniFi Switch 韌體到 8.x 版以後,筆者發現以下異常行為: 這個問題在 USW-Lite 8 PoE、USW-Flex Mini 等機種尤其明顯。升級 8.x 韌體後,即使完成 Adopt,仍會不定期出現 DHCP 放送。 🔍 二、問題分析 1️⃣ 版本變化造成的差異 項目 UniFi 7.x UniFi 8.x 之後 Provision 流程 使用舊版 inform-based 管理 改為 “UDAPI Provisioning” Switch DHCP 模式 僅於 Standalone 模式啟用 可能在 Provision…

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