Check out this URL on Cisco's site - looks like it may prove useful for what
you are trying to do.

http://www.cisco.com/warp/public/471/ttcp.html

Regards,

Bruce

""Priscilla Oppenheimer""  wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> At 05:56 AM 3/21/02, [EMAIL PROTECTED] wrote:
> >Just wondering if someone could help me out. I am trying to measure the
> >link capacity over a satellite link (VSAT) and wondered if there is way
of
> >being able to ramp up the throughput until saturation point from the CLI?
>
> Throughput is a measurement of the results of putting a load on a network.
> It's the quantity of error-free data successfully transferred between
nodes
> per unit of time, usually seconds. It depends on link capacity, processing
> speed at the nodes, memory at the nodes, etc. Those would be difficult to
> change, and in fact, are probably not the elements you want to vary as
part
> of your test anyway.
>
> I think what you really want to do is ramp up the load?
>
> It sounds like you want to do this from the router CLI. You could try an
> extended ping with the largest packet possible (without fragmentation,
> since fragmentation would take time) and the smallest delay between pings.
>
> You could try downloading a new IOS with TFTP or FTP if your router
> supports FTP. (FTP is a better test because it uses max frame sizes,
> whereas TFTP uses 512-byte blocks and is a ping-pong protocol that runs
> above UDP, with no windowing.)
>
> A better approach would probably be to use something other than the CLI.
> ;-) Most protocol analyzers have traffic generation features. Or you could
> simply start an FTP or HTTP or video streaming or something of that sort
> from a generic PC on the other side of the router.
>
> Priscilla
>
>
> >Best Regards
> >Scott Forbes
> >Network Support & Design Team
> >INVSAT Limited, Arnhall Business Park,
> >Westhill, Aberdeenshire, Scotland, UK.
> >www.invsat.com
> ________________________
>
> Priscilla Oppenheimer
> http://www.priscilla.com




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