Mac Address Instability

This will happen during a ethernet loop. Consider the following situation:

Since the MAC Table will store the mac address of whatever the device it receives the port from. The MAC address now could be coming from different switch and can be changed from the port

This is because when the PC broadcast it address, every other switch also have it as well and therefore the packet could come back to switch A which will lead to this occasion.

Note: this will normally happen during a Broadcast storm.