Cisco: err-disabled due to loop - but there are NO redundant physical paths/ wires/ connections



When configuring a Cisco switch, one of the most common issues that an IT admin encounters is the Error Disabled due to Loop (EDL) message. This error occurs when the switch detects a loop in the network, which can be caused by redundant physical paths that are configured incorrectly. The EDL message prevents the switch from forwarding traffic, and it can cause widespread network disruption if not handled in a timely manner.

When the EDL message is received, the first step is to identify the source of the loop. This can be done by examining the switch’s configuration and looking for any redundant physical paths that are configured incorrectly. If a redundant physical path is found, it should be disabled or removed to eliminate the loop.

If there are no redundant physical paths that could be causing the loop, the next step is to examine the switch’s ports for any physical loops. This can be done by running the show interfaces command and looking for any ports that are connected to multiple devices. If a port is connected to multiple devices, it is likely that a physical loop is present. In this case, the port should be disabled or disconnected to eliminate the loop.

It is important to note that the EDL message can also be caused by port security or VLAN trunking misconfigurations. If port security or VLAN trunking is enabled, it is possible that the switch is preventing traffic from flowing correctly and creating a loop. In this case, the port security or VLAN trunking configuration should be examined and adjusted as needed to resolve the issue.

Once the loop has been identified and eliminated, the switch should be reset to clear the EDL message and restore normal network operations. This can be done by running the reload command or power cycling the switch. Once the switch has been reset, it should be monitored for any further EDL messages.

In conclusion, the EDL message is a common issue that IT admins encounter when configuring Cisco switches. The source of the loop can be identified by examining the switch’s configuration and looking for any redundant physical paths or port misconfigurations. Once the loop has been eliminated, the switch should be reset to clear the EDL message and restore normal network operations.

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