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Loop error occurred at the aggregation switch

Loop error occurred at the aggregation switch

This guide will help you detect and fix network loops using Spanning Tree Protocol (STP), switch configuration adjustments, and loop prevention techniques. What Causes a Network Loop? A network loop c...

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8 Port Unifi Aggregation switch issues with more than 2 aggregated

I was wondering if anyone has played around with the 8 Port USW-Aggregation switches and run into any issues if you try and create more than 2 aggregation groups ? I have a few USW

Feb 07, 2026
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Link Aggregation on XT9 Creates a Loop

I''m trying to create a link aggregation between an XT9 acting as a router and a NETGEAR GS110EMX. The switch reports that both ports in the aggregation are up. When I do a cat

Aug 17, 2025
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Fix Network Loops: Step-by-Step Guide

Misconfigured Link Aggregation (LAG/Port Channel) – Improper bundling of multiple links can result in a loop. Now, let''s go through step-by-step troubleshooting to

May 01, 2026
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Resolution Guide

Confirm that at least one LAG child interface in the Aggregated Ethernet bundle is Physically Up (Link status Up). For each Child Interface that is not ''up up'', follow the steps in the

Dec 23, 2025
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layer 2 loop and link aggregation : r/networking

Is my understanding right? I am under the impression that if you connect two switches with link aggregation control protocol then since the two ports on each side act as one logical port that no

Apr 28, 2026
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Random disconnections from Dream Machine to Aggregation Switch

Looking for suggestions on where to start troubleshooting this things have been fine for a few months and all sudden I am having issues daily with my aggregation switch loosing connectivity to the dream

Jul 07, 2025
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Switch LACP Troubleshooting | FS

If the LACP mode of both ports of the device is passive mode, the aggregation relationship cannot be established. Both ends are in active mode, or one side is in active mode and one is in passive mode.

Feb 23, 2026
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Adoption Loop on Downstream Switch (TL-SG3210XHP-M2) after

I am experiencing a persistent adoption loop issue with a downstream switch and its connected APs whenever I upgrade the firmware on my main aggregation switch.

Sep 15, 2025
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Link Aggregation on XT9 Creates a Loop

The switch reports that both ports in the aggregation are up. When I do a cat /proc/net/bonding/bond0 on the router, it reports that both legs of the aggregation are up. When both legs of the LAG are up,

Jan 28, 2026
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Switch Port Aggregation Mismatch: Why Inconsistent Configurations

This seemingly minor mismatch triggered a chain reaction of STP loops and packet storms. Through this case study, we''ll dissect why switch aggregation ports demand surgical

Jun 04, 2026
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Re: Link Aggregation on XT9 Creates a Loop

When I turn off loop protection in the switch, the rocking back and forth stops, but the routing issues persist. I have a NETGEAR GS108T that I can connect to the GS110EMX in LAG as a

Nov 04, 2025
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Troubleshooting ESXi Host Network LACP Failure

This indicates that ESXi received a link status change event from the physical switch, stating that the uplink associated with LACP vmnicX has gone down. This also reflects ESXi reacting to the

Jul 07, 2025
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Switching Loops | Switch Networking Loop

A switching loop occurs when more than one path exists between the source and destination devices. With switching loops, when broadcast packets are sent by

Feb 24, 2026
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Huge aggregation triggers CircuitBreaker in loop

It looks like the cluster is trying to perform the aggregation request in loop and never cancels it even if the CircuitBreaker was hit. Does that makes sense?

Jul 31, 2025
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Troubleshooting STP

Otherwise, an accidental topology loop can cause a data-packet loop and disrupt the device and network operation. Enable the Link Aggregation Control Protocol (LACP) for port channels to avoid

Apr 21, 2026
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Ubiquiti User Support Group | Switch Goes Offline When Aggregation

Switch Goes Offline When Aggregation is Turned On I am trying to aggregate ports on a USW Pro Aggregation and USW Pro 48 PoE. I turned on aggregation on both (1+2 on the USW Pro

Jan 09, 2026
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Loop Prevention in Networks: Strategies and Best Practices

A network loop occurs when there is more than one path between two network devices, such as switches or routers. When a loop is present, data packets can circulate indefinitely, leading

Mar 01, 2026
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Chapter18:Link Aggregation Configuration

1.1 Overview Port aggregation is binding the physical ports with the same attribute together, so as to establish a logic channel. To aggregate multiple physical ports into a logical

Jun 24, 2026
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