Here is a useful script that can get data for mrtg without going negative when the numbers get really high. I am not an mrtg guru, this is just one way to fix the problem.

Tar file with readme should be attached which explains how to setup the Target line in the mrtg config file.

hope it works out for you... read the readme of course.

__________________________________ Do you Yahoo!? The New Yahoo! Shopping - with improved product search http://shopping.yahoo.com