Why cannot the switch learn an MAC address

The possible causes are:

The mac-limit command is used on an interface and the VLAN that the interface belongs to and the number of dynamic MAC address entries learned by the interface reaches the limit.

MAC address learning is disabled on the Ethernet interface and the VLAN that the interface belongs to by using the mac-address learning disable command.

A blackhole MAC entry or static MAC entry is created or the sticky MAC function is enabled.

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