[ns] how to set queue size

[Anaking <anaking@sina.com>]

Hi,

how to set queue size of different flows in a link.
I can use 
$ns queue-limit $n0 $n2 100
to set a link's queue size, however, how to set different flow's
queue size?

To think I have acquired flow by set flow [$fcl lookup auto 0 0 $i]
How to do it?

Thanks a lot