Hi,
There 's a Cisco IP phone that sits between a PC and the switch port. On the switch port, no MAC address is learned. However, the switch is able to detect the IP phone and deliver power to it:
TNSWACCS04A1#sh power inline fa1/0/13
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Fa1/0/13 auto on 5.0 IP Phone 7911 2 15.4
Interface AdminPowerMax AdminConsumption
(Watts) (Watts)
---------- --------------- --------------------
Fa1/0/13 15.4 15.4
TNSWACCS04A1#
TNSWACCS04A1#
TNSWACCS04A1#sh mac add dyn int fa1/0/13
Mac Address Table
-------------------------------------------
Vlan Mac Address Type Ports
---- ----------- -------- -----
TNSWACCS04A1#
any idea?
Switch is Catalyst 3750 with IOS version 12.2(58)SE1
Wass