ZyXEL Communications ES 3500 Series Troubleshooting Manual page 19

Check Err-Disable status
1. WebGUI:
If switch didn't detect loop, you can see the status of Loop Guard is
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"Forwarding".
Figure 1 Advanced Application > Errdisable > Errdisable Status
If switch detect loop, the status of Loop Guard is "Err-disable".
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Figure 2 Advanced Application > Errdisable > Errdisable Status
2. CLI:
Figure 3 Enter CLI command "show errdisable"
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