I've been testing some of our links with ttcp to make sure everything is ok and I don't seem to be getting much more than 350KB/s even testing between two stacked switches.
The highest i've managed to achieve is 1250KB/s between two brand new 3560's directly attached to each other.
Sample output ::
F:\utils\cisco\bandwidth>ttcpw -r -s ttcp-r: buflen=8192, nbuf=2048, align=16384
/0, port=5001 tcp ttcp-r: socket
ttcp-r: buflen=8192, nbuf=2048, align=16384/0, port=5001 tcp
ttcp-r: accept from 192.x.x.x
ttcp-r: 16777216 bytes in 51.13 seconds = 320.47 KB/sec +++
ttcp-r: 2066 I/O calls, msec/call = 25.34, calls/sec = 40.41
Agree with Rick and Joseph.
If you want to test for example Access lists, or something in that nature than you can test from switch to switch.
But if you want to test maximum throughput of the link, it really need to be done PC to PC.
Also, try different tools.
Like "iperf","hping", or FTP server-client transfers.
iperf is really easy one.
With HPING you have to monitor bandwidth load.
FTP will give you real life results, but is limited by PC bus speed/HDD performance etc.
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