From what you said maybe the problem is with port configuration on your switch and PC. If auto-negotiation is on on either the switch or PC then it must be on on both side. If you don't do this and auto-negotiation for port config is on only on one side then it is possible for the switch or PC to set their port to the wrong setting such as 10Mb at Half Duplex or something like that. This could result in some of the behaviors you described.
Also there is a known problem with some NIC drivers such that if you connect a 10/100 NIC to a Gigabit link on the switch and you enable auto-negotiation on both and if the auto-negotiation option on the switch is setup to offer Gigabit connection the NIC will fail to negotiate the correct speed. So in the case that you use auto-negotiation on a gigabit link to a PC running 10/100 you must "uncheck" or configure the switch auto-negotiation setting to not offer gigabit as an option.
So try this - setup fix configuration on both the switch and the PC instead of using auto-negotiation and just configure everything to maximum speed and full duplex for both switch port and PC. Then try your test again to see if it helps. If that works then try auto-negotiation but uncheck the options that the PC could not support such as gigabit to a PC running only 10/100.
I decided to dig a bit deeper, and here is what I've found.
Using 2 workstations (1Gb/s) to tx and rx large UDP packets, I then do a ping with a large packet as well (ping hostane -t -l 65000). I get good response back, until I plug in a 100Mb/s workstation to the switch, all I get is no reply.
It's seem that the 5324 does not know how to switch properly!
DELL-Cuong N.
1K Posts
0
September 23rd, 2005 14:00
From what you said maybe the problem is with port configuration on your switch and PC. If auto-negotiation is on on either the switch or PC then it must be on on both side. If you don't do this and auto-negotiation for port config is on only on one side then it is possible for the switch or PC to set their port to the wrong setting such as 10Mb at Half Duplex or something like that. This could result in some of the behaviors you described.
Also there is a known problem with some NIC drivers such that if you connect a 10/100 NIC to a Gigabit link on the switch and you enable auto-negotiation on both and if the auto-negotiation option on the switch is setup to offer Gigabit connection the NIC will fail to negotiate the correct speed. So in the case that you use auto-negotiation on a gigabit link to a PC running 10/100 you must "uncheck" or configure the switch auto-negotiation setting to not offer gigabit as an option.
So try this - setup fix configuration on both the switch and the PC instead of using auto-negotiation and just configure everything to maximum speed and full duplex for both switch port and PC. Then try your test again to see if it helps. If that works then try auto-negotiation but uncheck the options that the PC could not support such as gigabit to a PC running only 10/100.
BTW, are you using Jumbo frame?
Cuong.
lochuynh_ccc7da
2 Posts
0
September 23rd, 2005 14:00