em(4) link flapping

[Roman Kurakin]

Eugene Grosbein wrote:

>Hi!
>
>My Intel motherboard contains on-boad NIC:
>
>em0: <Intel(R) PRO/1000 Network Connection, Version - 1.7.25> port
>0xac00-0xac1f mem 0xfe9e0000-0xfe9fffff irq 10 at device 1.0 on pci2
>
>It it connected to Allied Telesyn AT FS724i unmanaged switch,
>media is autodetected correctly - 100baseTX full-duplex.
>
>It worked nice for 3 months. Today morning switch and em0
>start to loose/establish link every 5-10 seconds. They do it
>with autosensed media and with manually set 100baseTX (both half-duplex
>or full-duplex variants) now. I've forced it to 10mbit/half duplex,
>it seems to be much stable.
>
>This box has two more PCI ethernet cards, each of which is two-port em(4),
>so I have em0 (that has problems) and em1, em2, em3 and em4
>(that keep working OK).
>
>I tried to replace a cable, to reset the switch, to reboot this 4.9-STABLE
>box - nothing helps. What should I try next?
>  
>
Did you tried another port on a switch?

Best regards,
                      rik

>Eugene Grosbein
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>  
>