[ns] How to simulate Multi-RED with MNS v2.0

[Sir Fantomas]

Hi all,
My professor asked me to simulate a Multi-RED queue with MNSv2.0. Someone said that I can use the Diffserv patch of Sean Murphy but unfortunately I can't install it. Could anyone show me how to do my homework. Thanks so so much.

Node 
1-------------------------- Node 5
-------\-------------------------/
--------\-----------------------/
--------Node 3 -----------Node 4 

------- /----------------------- \
------/ 
--------------------------\
Node 2 ---------------------------Node 6

Node 1,2,5,6 = IP 
node
Node 3,4 = MPLS node
Node 1 sends AF11 data to Node 
5.
Node 2 sends AF12 data to Node 6.
Multi-RED is applied on the link between Node 3 and Node 4. I want to use the RIO-C to give priority to AF11 over AF12 when congestion occurs.