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[ns] Blocking a DropTail queue



Hi,

Does anybody know how to set the variable blocked_ for a DropTail queue
at a specified time?

If I use:

$ns duplex-link $n0 $n1 10ms DropTail
set q [[$ns link $n0 $n1] queue]
$q set blocked_ 1

Then the queue is successfuly blocked at the beggining of the
simulation. However if I try to block the queue later instead of at the
start of the simulation:

$ns at 6.0 "$q set blocked_ 1"

Then there are no error messages but the queue is never blocked.

Any ideas would be greatly appreciated.

Cheers,

Gustavo.