2

Network Status: Unexpected loop detected

Phoenix Contact · FL SWITCH 7000

What does 2 mean?

The Device Level Ring (DLR) protocol has identified an unintended redundant path, forming a network loop outside of the designed ring structure. This can lead to broadcast storms, packet duplication, and severe network instability if not resolved.

Common Causes

  • Incorrect physical cabling that inadvertently creates an unauthorized loop in the network segment.
  • Misconfiguration of a device's DLR ports, causing it to bridge traffic in a way that bypasses the intended ring topology.
  • Connection of a non-DLR compliant device or a standard switch incorrectly into the DLR.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Carefully review the physical network topology to identify any unintended cable connections between DLR-enabled devices or connections to external switches.

  2. 2

    Examine the DLR port configurations on all ring participants, ensuring that port roles and settings are correctly assigned and not inadvertently creating bridging loops.

  3. 3

    Disconnect any recently added network devices or cables one by one to isolate the source of the unexpected loop.

Browse all codes in this manual (4)
Verified technical data. Last updated: March 2026

Related Faults

Source: Phoenix Contact FL SWITCH 7000