topic Half Vs Full Duplex - HELP!! in Operating System - HP-UX

Half Vs Full Duplex - HELP!!

Matt Pitson — Thu, 06 Sep 2001 10:40:18 GMT

I understand that there is no problem running Full duplex on a fibre switch supporting a number of switches. But is there any impact on Hubs or serial servers that "hang" off of those switches? or are they just seen as network nodes that are autosenced by the switch. I'm keen to get my our network running as fast as possible and any comments that might help would be gratefully appreciated.

Re: Half Vs Full Duplex - HELP!!

Ravi_8 — Thu, 06 Sep 2001 12:50:09 GMT

Hi,
if your hubs and serial servers are half duplex and switches are full duplex, it definately causes problem to the switches. better way is either of all them half duplexed or all of them full duplexed.

later...

Re: Half Vs Full Duplex - HELP!!

Darrell Allen — Thu, 06 Sep 2001 13:01:29 GMT

Hello Matt,

I'm no expert but sure, you can hang hubs off a switch. Since hubs typically auto-sense themselves, they should negiotiate with the switch and hopefully both set their speed and duplex to match the other. However, if they don't negiotiate correctly, one could be set in half and the other in full duplex which results in highly degraded performance. The best I can say is to check your manuals then verify what the ports are set to after connection.

Darrell

Re: Half Vs Full Duplex - HELP!!

Brian J Noftsier — Thu, 06 Sep 2001 13:08:28 GMT

Fiber has to run in HDX. If you have hubs - ALL HUBS run HDX. Don't rely on auto negotiate. Set the port to Half Duplex. HDX and FDX on the same wire cuase problems

Re: Half Vs Full Duplex - HELP!!

Brian Hackley — Tue, 11 Sep 2001 11:01:52 GMT

Matt,

You didn't state what kind of network you're working with, but the answer to your questions can most likely be found at the HP-UX Network Lab website: http://techsolutions.hp.com/
This site contains detailed installation, configuration, and debugging instructions for most HP-UX Network link products.

Hope this helps a little,

-> Brian Hackley