--> MAC Flapping occurs when a switch receives the frames with same MAC address from different interfaces.
--> There are so many reasons because of which, MAC Address Flapping can occur
i) If you are getting so many MAC Addresses in the switch are flapping then the issue is Layer 2 loop.
ii) NIC Card of the Device is Faulty.
iii) If the device is having two NIC cards and they are connected to switch without EtherChannel or port channel.
iv) If unmanaged switch or hub is connected to the switch.
v) Duplicate IP Address
vi) Misconfiguration of Port Channel or HSRP
--> There are so many reasons because of which, MAC Address Flapping can occur
i) If you are getting so many MAC Addresses in the switch are flapping then the issue is Layer 2 loop.
ii) NIC Card of the Device is Faulty.
iii) If the device is having two NIC cards and they are connected to switch without EtherChannel or port channel.
iv) If unmanaged switch or hub is connected to the switch.
v) Duplicate IP Address
vi) Misconfiguration of Port Channel or HSRP
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