So Last time I mentioned you can generate traffice between two routers using TCP small Servers. This does work fine but there are some limitations, it can’t genetrate large amounts of traffic, it puts a high load on the CPU and it does not tell you much once it has completed.
A second method I came across is “TTCP” (Test TCP) which is avalible on many of the more recent IOS versions (11.2 upwards). This method not only gives you more control over the data that is sent, but also will provided you with infomation on how the trasfer of data went once it is complete. TTCP is also avalible for Windows and Linux/Unix, which means you can test between various end stations on the network.
It is all very simple to set up, simply at the “>” or “#” prompt type “TTCP”, and then follow the prompts. You will need to set up one router as the sender first, and then the second as the reciver. You can leave all the settings as default (you may want to reduce the “nbuf” setting as the default of 2048 can take some time to complete, espicaly on a slow link).
Once complete you will get an out put of time taken and bandwith achived among other stats. Again this is a very simple tool to give you a indication as to the state of a link, you can find more details in the below link to the CISCO site.