Slow 100 mbps port - Cisco 1924 Switch

[vkurikala]

I have a problem with Cisco 1924 Switch. <br>
<br>
The Server is a PIII machine,128 MB RAM, 9 GB HDD with a 3 Com Fast Ethernet Card installed and running on NT4.0. <br>
<br>
When it is connected to the 100 mbps port on the switch, the performance is coming down drastically. A 5 MB file transfer is taking about 15 minutes and sometimes it even cancells with a message that a serious network error has occured. It is the same on both the 100 mbps ports. When the same server is connected to a 10 mbps port it is taking about 30 seconds to transfer. <br>
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I have checked the port performance statistics and there are absolutely no collision or transmit/receive errors. <br>
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I have tried all combinations of configuration like making it full duplex, half duplex, agressive Enhanced Congestion Control etc but to no avail. I even did a factory reset but things did not improve.<br>
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I have tried on two switches and it is slightly better on the other switch. It is taking about 5 min for 5 MB file transfer.<br>
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<br>
Could anyone please let me know what could be wrong and how to solve this problem.<br>
<br>

 

[SmithB]

Sounds like the problem is the wiring between the switch and the server. If your wiring is not up to Cat5 quality then your network will run fine at 10mbps but very slowly at 100mbps. I've seen this problem any number of times where the devices will autoconnect at 100mbps but will not run at that speed due to low spec wiring. SmithB.

 

[cbz]

Are you running both the server and port at full duplex? Make sure the port is set to full duplex, not auto negotiate or full duplex with flow control. Also configure the server manually for 100mb and full duplex. Auto-negotiate does not work that great! I highly recommend set all 100mb ports manually.

 

[vkurikala]

1. I tried connecting the server directly to the switch bypassing the patch panel using a factory crimped AT&T patch cord. Things did not improve.<br>
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2.I tried making full duplex on both. No luck.<br>
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I am planning to try a different card. I will keep you updated.

 

[cbz]

Are you running RIP on your network? One other thing you can do to speed things up is to disable RIP under the IP configuration menu. I still feel that the source of your problems is in the NIC card. Hopefully changing out the card will or just the drive for the card will fix the problem.

 

[Zelandakh]

A number of things to try - <br>
<br>
1. manually set the Cisco to 100<br>
2. turn off spanning tree (probably won't make a difference)<br>
3. manually set the 3Com to 100<br>
4. Mod Tap your patch cable and ensure it is fully CAT 5. Do not duplex in the first instance.<br>
<br>

 

[vkurikala]

Dear all,<br>
<br>
The problem is actually solved. I have even posted a message here but I can't see it now.<br>
<br>
I tried with a D-Link 10/100 card on the server and it just worked fine. So it must have been incompatibility of 3com with the mother board or some problem with the drivers.<br>
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Anyways my client is happy and thank you all for your help.<br>