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 and blackhole 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	Forwards the frame according to the destination MAC address regardless of whether the frame's ingress interface is the same as that in the entry.
Blackhole MAC address entry	Drops the frame.
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