What the the.....
Switch-01#show mac address-table int gi1/17
Legend: * - primary entry
age - seconds since last seen
n/a - not available
vlan mac address type learn age ports
------+----------------+--------+-----+----------+--------------------------
No entries present.
Switch-01#show mac address-table | inc 1/17
152 3417.ebd4.3e29 static Yes - Gi1/17
Switch-01#show run int gi1/17
Building configuration...
Current configuration : 271 bytes
!
interface GigabitEthernet1/17
description (USR) Rm 134
switchport
switchport access vlan 152
switchport mode access
switchport port-security
switchport port-security mac-address sticky
switchport port-security mac-address sticky 3417.ebd4.3e29
end
6509 Sup32 12.2(33)SXJ7
Maybe it's because of the port security (static binding vs dynamic)?
maybe it needs a good hard reboot.