Manual:Layer2 misconfiguration

Applies to RouterOS: v6.0 +

Introduction

There are certain configuration that are known to have major flaws by their design and should be avoided by all means possible. Misconfigured Layer2 can sometimes cause hard to detect network errors, random performance drops, certain segments of a network to be unreachable, certain networking services to be malfunctioning or a complete network failure. This page will contain some common and not so very common configurations that will cause issues in your network.