![]() If the switch were to then receive a frame on port 0/2 with a source MAC address of aaaa, there would be clash and the switch would log something like this: 1664321: Nov 14 11:18:16 UTC: %MAC_MOVE-SP-4-NOTIF: When B replies the MAC address table becomes: Port HostĪnd the switch forwards the frame to port 0/1 – there is no need to flood now since the location of A is known. ![]() ![]() The switch populates it MAC address-table something like: Port HostĪnd floods the frame out of all other ports. Assume A is on port 0/1 and B is on port 0/2. Say a device ‘A’ with MAC (hereafter aaaa) sends a frame to device ‘B’ with MAC address bbbb. Switches learn where hosts are by examining the source MAC address in frames received on a port, and populating its MAC address-table with an entry for that MAC address and port. If this makes no sense, perhaps a quick summary of how switching at layer 2 works will help. A MAC Flap is caused when a switch receives packets from two different interfaces with the same source MAC address.
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