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Webcast-Catalyst9k
New Member

3550 port problem diagnostics

A HP printer connected to f0/42 on a 3550 suddenly lost connections. The cable and jacks were tested fine. Interface light on the Catalyst looked normal. Hooked a laptop to the wall jack. It auto-negotiated and had a L2 link connection. But no traffic could pass. Changing speed/duplex on both end didn't help. Switchport interface doesn't have any physical/link layer errors. Only errors were 44392 underrun errors which other ports on this switch also have. Changing Vlan configuration or shutting down the interface did not work. "sh post" looks fine.

"sh controller ethernet-controller fastEthernet 0/42" has only the follow errors:

44392 Discarded frames

1190 Symbol error frames

1187 Invalid frames, too small

0 Valid frames, too small

This is the second time it happened. The only solution I have is to reload the switch, which fixed the problem last time.

Does anyone have any idea to figure out what exactly went wrong with f0/42? I guess the interface controller is bad.

Thanks much in advance!

3 REPLIES
Silver

Re: 3550 port problem diagnostics

Had this kind of problem before. It is a hardware defection. We opened an RMA with Cisco and replaced the switch.

Hope this helps,

Regards,

New Member

Re: 3550 port problem diagnostics

Thank you very much! I will open a TAC case.

Silver

Re: 3550 port problem diagnostics

Hello,

I am glad I could help. Will you please rate the response,

Thanks,

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