[ns] question about implementing shared buffer in ns

[asimon@esoc.esa.de]

Hi,
I am new to ns, and I am working on buffering and scheduling in switches. I
would like to do some simulations with ns.
So my question is: does someone know if it is possible to dynamically (i.e.
running time) modify
parameters of a queue (like its length) in order to simulate a shared buffer
space among several queues?

I would be grateful if someone could answer to me
Thank you
Audrey