Catalyst 3560 PoE Port ASIC Port Loopback Test Issue

Unanswered Question
Mar 8th, 2010

Hi,

We have a switchports issue in this specific switch, wherein some switchports cannot be

turned on.  Whenever we try to perform a (shut/no shut) on the interface, it shows this

message:
----------------
Fa0/1 can't be brought up because it failed POST in loopback test
----------------
We also tried to 'reload' this switch, but still those switchports remains down. When we

transfer a device from a defective switchport to a working switchport, the device is working

fine.  Thus, the phsyical connection or host set-up is OK.

Here's the output from "sh post" command:

----------------
Stored system POST messages:

Switch 1
---------

POST: CPU MIC register Tests : Begin
POST: CPU MIC register Tests : End, Status Passed

POST: PortASIC Memory Tests : Begin
POST: PortASIC Memory Tests : End, Status Passed

POST: CPU MIC PortASIC interface Loopback Tests : Begin
POST: CPU MIC PortASIC interface Loopback Tests : End, Status Passed

POST: PortASIC RingLoopback Tests : Begin
POST: PortASIC RingLoopback Tests : End, Status Passed

POST: Inline Power Controller Tests : Begin
POST: Inline Power Controller Tests : End, Status Passed

POST: PortASIC CAM Subsystem Tests : Begin
POST: PortASIC CAM Subsystem Tests : End, Status Passed

POST: PortASIC Port Loopback Tests : Begin
POST: Failed PortMacLoopback Packet Receive asic_index 1 port_hardware_index 2
POST: Failed PortMacLoopback Packet Receive asic_index 1 port_hardware_index 3
POST: Failed PortPhiLoopback Packet Test asic_index 1 port_hardware_index 2
POST: Failed PortPhiLoopback Packet Test asic_index 1 port_hardware_index 3
POST: Failed PortPhiLoopback Packet Test asic_index 1 port_hardware_index 4
POST: Failed PortPhiLoopback Packet Test asic_index 1 port_hardware_index 5
POST: Failed PortPhiLoopback Packet Test asic_index 1 port_hardware_index 10
POST: Failed PortPhiLoopback Packet Test asic_index 1 port_hardware_index 11
POST: Failed PortPhiLoopback Packet Test asic_index 1 port_hardware_index 12
POST: Failed PortPhiLoopback Packet Test asic_index 1 port_hardware_index 13
POST: Failed PortPhiLoopback Packet Test asic_index 1 port_hardware_index 18
POST: Failed PortPhiLoopback Packet Test asic_index 1 port_hardware_index 19
POST: Failed PortPhiLoopback Packet Test asic_index 1 port_hardware_index 20
POST: Failed PortPhiLoopback Packet Test asic_index 1 port_hardware_index 21
POST: PortASIC Port Loopback Tests : End, Status Passed
----------------


Thanks in advance for your replies.

Brgds,

I have this problem too.
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Collin Clark Mon, 03/08/2010 - 07:43

Looks like a hardware failure and you should open a TAC case for an RMA.

Hope it helps.

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