To stop a network loop, enable the Spanning Tree Protocol (STP) or Rapid Spanning Tree Protocol (RSTP) on your switches to ensure a loop-free topology. Utilize switch features like BPDU Guard, Root Guard, and Loop Guard to prevent loops. This document describes how to identify and troubleshoot layer 2 loops in networks including Catalyst 9000 series switches. The information in this. Switching loops occur when network switches are connected together in such a way that network traffic loops around infinitely instead of traversing the hops needed to travel from source to destination. If left unresolved, network loops can disrupt communication, slow down network performance, and even crash switches or. The problem happening is that the core switch is disabling one uplink configured as a lag to one of the edge cabinets, when viewing the logs on the core, i found the below : LOOP DETECTION: VLAN 102, port lg110 detect, putting into err-disable state after disabling, reenabling the lag ports on the. Used to have a WRT54, then three WRT54 with Tomato in "mesh" operation, so to speak, Then an Asus router with three access points, then a Fritzbox, four access points with several managed netgear switches, but I've never had anything as unreliable and unstable as my current OmadaSDN, and the whole. This article describes how to troubleshoot issues with the Spanning Tree Protocol (STP).