LAN switches will use the CAM tables to forward packets. and these tables are filled by a process called MAC learning whereby switch notes down the MAC address from the source field of the frames and tie the interface to that MAC. but what happens when the switch does not know (or has not learnt yet) the destination for a particular MAC? it will forward it to all the interfaces except the one it received it from. This process is called unicast flooding.
Most of the switches do it per VLAN and this coupled with asymmetric routing can create a condition where by switch cannot learn the destination for specific traffic and has to resort to unicast flooding everytime it has to forward a packet. I will take that in a follow up post.
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