3550 GBIC interface cycling

[bertieuk]

Hi

I have plugged in a backup server into a gbic on a 3550 cisco switch. The port becomes available (green status) but after approx 5 seconds the status turns orange. Then status then cycles approx every 30 seconds.

My initial thoughts were an issue with spanning tree/portfast or a physical loop existing. The looping status is only evident on the GBIC card.

Can anyone help me track the problem.

Thanks
Si

 

[congogrey]

what are the messages comming to the console regarding the port?

"For every complex problem, there is a solution that is simple, neat and wrong" -- H.L. Mencken

 

[baddos]

Does the server have more than one NIC installed on it?

 

[bertieuk]

yes there is more then one NIC card in the server. The first is a an onboard intel pro 100 and the second is a 64bit pci intel pro 1000. The server is linux.

I haven't managed to get back to the site to perform any debug stuff yet but will do in the next couple of days.

Thanks

Si

 

[baddos]

If the two NIC are connected to the same broadcast domain (VLAN) and aren't configured in a "Team", then you'll see the switch shutting down one of the ports.

 

[bertieuk]

We do have two NICs but there is definitely only one plugged in at the moment.

Thanks Si