Why are source MAC addresses not learned

The causes are as follows:

-The device does not receive packets because the link is Down, the interface does not join the VLAN, the interface participates in spanning tree calculation and is blocked, and so on.

-Loops cause MAC address flapping.

-MAC address learning is disabled or corresponding Sticky MAC address entries already exist.

-The number of learned MAC address entries has reached the maximum.

-The static or blackhole route is configured.

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