4 port security troubleshooting, Port, Security – QTECH QSW-3400 Инструкция по настройке User Manual
Page 111: Roubleshooting

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Switch(config-if- ethernet1/1)#exit
Switch(config)#
13.4 PORT SECURITY Troubleshooting
If problems occur when configuring PORT SECURITY, please check whether the problem is
caused by the following reasons:
Check whether PORT SECURITY is enabled normally
Check whether the valid maximum number of MAC addresses is configured