The drop illegal-mac alarm command configures the switch to send a trap to the network management system (NMS) when receiving a packet with an all-0 MAC address.
The undo drop illegal-mac alarm command deletes the configuration.
By default, the switch does not send a trap to the NMS when receiving a packet with an all-0 MAC address.
Usage Scenario
Some legacy computers or network devices may send packets with an all-0 source or destination MAC address when their network adapters fail. The drop illegal-mac alarm command configures the switch to send a trap to the NMS when receiving a packet with an all-0 MAC address. You can locate the faulty network adapter according to the trap message.
Precautions
If the alarm function is disabled on the switch, the NMS cannot receive any trap message.
After you run the drop illegal-mac alarm command, the switch sends a trap only once after receiving packets with an all-0 MAC address. To configure the switch to send traps continuously, run the drop illegal-mac alarm command repeatedly.
This command and IPv6 over IPv4 cannot be configured simultaneously on the S6720-SI, S6720S-SI, S5730-SI, S5730S-EI, S5720I-SI, S5720-SI, and S5720S-SI.