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Firstly , performing MAC learning in hardware alleviates the switch control plane from that function , freeing up important Switch CPU processing capacity for other control plane bound tasks . As storage area networks ( SANs ) grow , so do the challenges for monitoring and resolving performance issues . The early moments of consciousness flicker and fade ; the body moves ; there are grunts and then , sleep kicks back in . When a switch hears an IGMP join request from a host for a given multicast group , the switch adds the host 's port number to the group destination address list for that group . We 'll return to the concept of fitness several times over the coming months .