flow id's and .tr files

[Alex Roetter]

i'm having trouble setting flow id's for cbr senders attached to udp
agents, and seeing that flow id appear in the tracefile.

if i set the fid_ variable of a tcp agent, it works no problem (the new
flow id is shown in the trace file for packets from that agent)

but if i do the same thing for a udp agent
$udp set fid_ 7

the flow id still shows up as zero in the trace file. this makes it very
differnet to differentiate packets by sender for post-processing of the
.tr files. does anyone know how to do this?

thanks,
alex