ZyXEL Communications ES 3500 Series Troubleshooting Manual page 20

3. Loopguard event also record in system logs.
Figure 4 Enter CLI command "show logging"
Confirm Loop
We suggest that to enable Loop guard one by one from the core switch to the end
switch in topology. So that we can find where is loop.
Remove Loop
Un-plug cable from Err-Disable port.
Recovery Loop Port
1. If the port detect loop, the port status will become to "Err-disable".
WebGUI:
Figure 5 Advanced Application > Errdisable > Errdisable Status
CLI:
Figure 6 Enter CLI command "show interface Port-ID"
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