> -----Original Message----- > From: linux-net-owner@xxxxxxxxxxxxxxx [mailto:linux-net-owner@xxxxxxxxxxxxxxx] On Behalf Of Yossi Ben > Hagai > Sent: Tuesday, May 25, 2010 2:18 PM > To: Chris Fowler > Cc: Jan Ceuleers; linux-net@xxxxxxxxxxxxxxx > Subject: Re: Ethernet link force-up > > The setup is as follows - > [Sending server NIC][TX]-----fiber conductor----[RX][Receiving server NIC]. > A physical setup limitation provides only a single fiber conductor > between the servers, but it should still be doable as traffic is > always unidirectional (over connectionless protocol) from sending > server to receiving server. > > In such case the receiving server NIC status is UP and processing > ingress frames, however the sending server NIC status is down as it > doesn't detect light on its RX. > of course if I supply light to the sending server NIC from another NIC > on the same server the link goes up and it works as expected, but I > suspect it may be possible to force the link status on driver / OS > level. > > And no, its not part of dharma initiative... I don't know about your particular hardware, but some hardware is designed to not transmit in cases like this to prevent eye injury. Do yourself and everybody else in that lab a favor and make sure the unconnected TX is covered up. Some of those lasers are surprisingly high power. The infrared frequencies used may be invisible to the human eye, but that won't stop them from burning your retina if the beam happens to enter one of your pupils. Jeff Haran Brocade -- To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
