trace Average Queue Size in RED

[Fusun Inanc <fusun@poptop.ee.psu.edu>]

Hi,

I created a link which uses RED queue algoritm. And I want to trace average 
queue size . How can I do that? 

I used the following , but it doesn't help...

$ns duplex-link $n1 $n2 3Mb 10ms RED
set avgque [Queue/RED set mean_pktsize_]
puts " Average Queue Size = $avgque "

Thanks in advance..

Fusun Inanc