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On vrijdag, september 13, 2002, at 02:45 , Hamish Marson wrote: > I have yet to see a server correctly detect duplex when set to > auto-negotiate with a switch. Not just Sun, but every other vendor we > have as well. In fact a few years back, even the cisco engineers didn't > rate the chances of seeing a successful suto-negotiation for duplex. > Speed is OK, but everything just seems to grab half duplex when they > should be full... Hi, when the switch is hard set to some setting (100FD) (especially cisco) the server must also be hard set, when the switch sets auto-negotiation, the server must also be set to auto-neg. I've noticed again and agian that the switch stops doing auto-neg when set hard to one speed. I have very good experience with both sun and ibm servers (and even pc's) doing good auto-neg with cisco and foundry switches. When the switch is set hard, and the host auto-detect, the host will detect speed fine (this is _detectable_) but the host cannot _negotiate_ duplex and will do the safest thing, half duplex, since dumb 100Mb/s hubs cannot do negotiation... it must assume half-duplex... If cisco would be as nice as to enable auto-negotiating for just one setting, that would help a lot in many cases.... Setting the cisco to something hard guarantees you'll have to set the same on the host... - --- Met vriendelijke groeten, Remco Post SARA - Stichting Academisch Rekencentrum Amsterdam http://www.sara.nl High Performance Computing Tel. +31 20 592 8008 Fax. +31 20 668 3167 PGP keys at http://home.sara.nl/~remco/keys.asc "I really didn't foresee the Internet. But then, neither did the computer industry. Not that that tells us very much of course - the computer industry didn't even foresee that the century was going to end." -- Douglas Adams -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (Darwin) iD8DBQE9geDWBIoCv9yTlOwRArXjAJwMvCKQ4p7pgodx5GFBx2s4nJk7cwCfTQ7v Ffp9WmcwN20E01U4YKIIgqQ= =5z+d -----END PGP SIGNATURE-----
