Configuration guidelines

You cannot add a dynamic MAC address entry if a learned entry already exists with a different outgoing interface for the MAC address.
The manually configured static, blackhole, and multiport unicast MAC address entries cannot survive a reboot if you do not save the configuration. The manually configured dynamic MAC address entries are lost upon reboot whether or not you save the configuration.

A frame whose source MAC address matches different types of MAC address entries is processed differently.

Type	Description
Static MAC address entry	Discards the frame received on a different interface from that in the entry. Forwards the frame received on the same interface with that in the entry.
Multiport unicast MAC address entry	Learns the MAC address (for example, MAC A) of the frame, generates a dynamic MAC address entry for MAC A, and forwards the frame. However, the generated dynamic MAC address entry does not take effect. Frames destined for MAC A are forwarded based on the multiport unicast MAC address entry.
Dynamic MAC address entry	Learns the MAC address of the frames received on a different interface from that in the entry and overwrites the original entry. Forwards the frame received on the same interface as that in the entry and updates the aging timer for the entry.

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Configuring MAC address entries	home	Adding or modifying a static or dynamic MAC address entry globally