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No MAC Listed with Switch Port Mapper

I am trying to see if we have someone connected multiple devices via a switch or hub using SPM, but it doesn't return a MAC address. Other ports on the switch do return MAC's, but there are two ports that do not. Can anyone give me a hint as to which way to go on this?

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ceclark

Do you see a mac address in the cam table of that port?

CORE1#show mac-address interface fa3/3
Legend: * - primary entry
age - seconds since last seen
n/a - not available

vlan mac address type learn age ports
------+----------------+--------+-----+----------+--------------------------
* 614 0014.3850.468d dynamic Yes 20 Fa3/3

CORE1#

2020

Normally if the port is up and there's no mac address it's because the connected device isn't powered on.