switch 4506

some intrafces on the switch show me the following .I can't see the mac-address.Any one knows why ?

SWITCH1001#sh mac-address-table int fa2/29
Multicast Entries
 vlan    mac address     type    ports
  14    ffff.ffff.ffff   system Switch,Fa2/26,Fa2/29,Gi4/29,Gi4/30,Gi4/31
Who is Participating?
Don JohnstonConnect With a Mentor InstructorCommented:
Has there been any recent traffic? The entries are aged out after 300 seconds.
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