Hello,

So basically we have a VOIP setup with the PC connecting to the back of the phone. Nothing fancy. I wanted to turn port security on to only allow the phone and the PC to prevent hubs from being connected " authentication port-control auto " and always is showing drop and keep booting the ip phone.

MAC addresses associated with that port that the phones VLAN is showing up in both the VOIP and Data VLAN

(81 is the Data VLAN. 126 is the VOIP VLAN)

Switch01#show mac address-table | i 1/0/8

  81    0024.7edb.3336    DYNAMIC     Gi1/0/8

81    0060.b955.dec6    DYNAMIC     Gi1/0/8

126    0060.b955.dec6    DYNAMIC     Gi1/0/8