Simulation times and traffic stream label

While runing your script on ns2.28, 2.29 and 2.31, it is showing following error. ( I will try it on ns2.30 latter).

num_nodes is set 2

(_o3 cmd line 1)
invoked from within
“_o3 cmd change-numifs 2”
invoked from within
“catch “$self cmd $args” ret”
invoked from within
“if [catch “$self cmd $args” ret] {
set cls [$self info class]
global errorInfo
set savedInfo $errorInfo
error “error when calling class $cls: $args” $…”
(procedure “_o3” line 2)
(SplitObject unknown line 2)
invoked from within
“$ns_ change-numifs $val(ni)”
(file “test2.tcl” line 41)

You can set the label of a node as we set the color previously.

while running a simulation, if there is nothing for recording (ie, no traffic due to some reason), then the simulation will not show anything beyond that even if you are running it for some more time.