When the packetframe's destination MAC-address is unknown for the switch (not included in its address table), the unit sends this packet to frame to all hosts of the network, except for the sender interface.
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R5000 unit sends packets with sends frames with unknown MAC-address to all ports until it receives a response with the packet which frame which contains this address as the sender. After this the unit will "learn" (i.e., the unit adds the MAC-address to its address table and reserves this MAC-address for the port where the packet was frame was received). If the unit can't learn in 4 seconds, and packets frames still arrive, traffic to this direction will be blocked for 4 seconds. Then the process repeats.
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