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IP accounting will do this for you but will eat up LOTS of CPU / memeory. Another option is to create ACL's that permit every host in the subnet and then apply them to the interface. You can then see who is using the bandwidth. EG:ip access-list ex B...
From what I can see, the "boot buffersize" command only changes the size of the buffer allocate in RAM to hold the config downloaded from the network, and this will not help in your case (although, it does raise aninteresting point - have you conside...
Um, my suggestion is to replace the switch with a hub as a test and make sure that everything is working fine like that... I am also assuming that you have rebooted the switch.... If not, try that... Also, keep in mind that the netscreen can be confi...
What it sounds like is that the ifindex changed when the box was rebooted. You need to figure out what the new ifindex is and update MRTG to reflect this (if you are using a UNIX box, snmpwalk should help). You may also want to turn on persistant SNM...