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Definition of span. 1  1 : the distance from the end of the thumb to the end of the little finger of a spread hand; also : an English unit of length equal to nine inches (22.9 centimeters)
Source (SPAN) port-A port that is monitored with use of the SPAN feature. Source (SPAN) VLAN-A VLAN whose traffic is monitored with use of the SPAN feature. Destination (SPAN) port-A port that monitors source ports, usually where a network analyzer is connected.