failed POST in loopback test

Unanswered Question
Jan 31st, 2007

Hi,

i've a problem on a port of a switch 3550.

i attach the output of the telnet session:

SW3550A(config)#int fast 0/35

SW3550A(config-if)#no shut

Fa0/35 can't be brought up because it failed POST in loopback test

SW3550A#show post

Stored system POST messages:

POST: CPU Buffer Tests : Begin

POST: CPU Buffer Tests : End, Status Passed

POST: CPU Interface Tests : Begin

POST: CPU Interface Tests : End, Status Passed

POST: Switch Core Tests : Begin

POST: Switch Core Tests : End, Status Passed

POST: CPU Interface 2nd Stage Tests : Begin

POST: CPU Interface 2nd Stage Tests : End, Status Passed

POST: CAM Subsystem Tests : Begin

POST: CAM Subsystem Tests : End, Status Passed

POST: Ethernet Controller Tests : Begin

POST: Ethernet Controller Tests : End, Status Passed

POST: Loopback Tests : Begin

looped-back packet not received on controller 3, channel 11

POST: Loopback Tests : End, Status Passed

Fa0/35 can't be brought up because it failed POST in loopback test

Fa0/35 can't be brought up because it failed POST in loopback test

Fa0/35 can't be brought up because it failed POST in loopback test

Fa0/35 can't be brought up because it failed POST in loopback test

Fa0/35 can't be brought up because it failed POST in loopback test

Fa0/35 can't be brought up because it failed POST in loopback test

Fa0/35 can't be brought up because it failed POST in loopback test

SW3550A#

CAN YOU EXPLAIN ME THE PROBLEM?

i don't find documentation about this problem.

THANKS FOR YOUR HELP.

fcostalunga

I have this problem too.
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lgijssel Wed, 01/31/2007 - 02:51

POST failures are bad news. This is almost certainly a hardware problem. Retry the boot without anything connected to the port. If the problem remains (as I assume that will be the case) this means that you have a faulty interface.

Regards,

Leo

fcostalunga Wed, 01/31/2007 - 02:59

thenks for your help.

I wan't to know if exist a document that explain this problem.

Can you have a link of cisco.com that treat this argument?

thanks

FCostalunga

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