We have recently reconfigured our Ethernet network form a 3Com switched evironment where we would have switch to switch daisy chained from closet to closet to datacenter. We would average 4 to 8 hops from start to finish for just about every connection we made. We now have an environment where we jump no more than 4 hops to reach the destination. My problem is we do a file extraction from our IBM mainframe to a workstation. The extraction is a 400mb file and before we reconfigured our network the extraction was taking about 10-20 minutes. Since then it is taking 4 or more hours. Here is the existing path= Desktop(100mb, full) -->4006swtch (1gb full) --> 6513swtch (100mb full)--> 7200rtr (98mb)--> MF (via escon chnl). I have placed a Linksys 10/100 hub between the desktop and the 4006 switch and now the file extraction is back to normal. I am lost as to how adding a hop would increase the performance of this extraction. As a side note, we have seen nothing but increased performance from all of our other applications. This is the only one that has been affected.
I did have a duplex mismatch between our 6513 core switch and our 7200 router that our mainframe is connected to. I have corrected this which has resolved some of the performance loss.
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