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Solution # K14433992
Title The Gigabit Ethernet port does not work on Catalyst 2960 series switches and the "Failed PortPhiLoopback Packet Test" error message appears
Core issue
The Gigabit Ethernet interface of the Catalyst 2960 series switch fails in the PortPhiLoopback Packet Test of the power-on self-test (POST). This problem is observed in a Catalyst WS-C2960-48TT-L that runs Cisco IOS® Software Release 12.2(25)SEE2.
 
These POST messages can appear: 
POST: PortASIC Port Loopback Tests : Begin
POST: Failed PortPhiLoopback Packet Test asic_index 1 port_hardware_index 0
POST: PortASIC Port Loopback Tests : End, Status Passed
This issue is documented in Cisco bug ID CSCsg33994.
Resolution

In order to workaround this issue, hardcode the speed command to 100 and the duplex command to Full on the affected ports.

In order to resolve this issue, upgrade to Cisco IOS Software Release 12.2(35)SE or later, which can be downloaded from the LAN Switching Software page.
Problem Type Syslog error message received
Problem frequency During switch bootup
Catalyst switch Catalyst 2960 series switches
Port type 1000 TX
Switch software Cisco IOS system software
Error message POST FAILURE
Direct URL http://www.ciscotaccc.com/lanswitching/showcase?case=K14433992

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