Install traffic-control layer on the topology in ns3

  c++, ns-3, queue, simulation, traffic-simulation

I want to install the traffic-control layer on my topology below. I tried creating the topology with 3 nodes including node 0, node 1, and node 2. I created 2 p2p links, one between node 0 and node 1, another between node 0 and node 2. I want to measure traffic from node 1 and node 2 sent to node 0. I built as the "" file in the tutorial of ns3, however, I see that node 0 has two qdiscs built with node 1 and node 2. I want to have one qdisc on node 0 to measure traffic from other nodes to node 0. How can I do it?
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Source: Windows Questions C++