[ns] Pushback usage in ns-2.33

[muralikrishna g]

hi..
i have created a network using tcl script.. and i made traffic flow too

i am in need use the pushback message when a queue at router fills.. i am
using ns-allinone-2.33.. can anybody please tell me how to use pushback here
over a particular node.

please tell me how to use pushback.

if you have code for this scenario please send me to
muralikrishna4g at gmail.com

thanx in advance