em(4) link flapping
From: Eugene Grosbein (eugen_at_kuzbass.ru)
Date: 04/26/04
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Date: Mon, 26 Apr 2004 17:58:29 +0800 To: net@freebsd.org
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?
Eugene Grosbein
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