5. Attributes

In ns-3 simulations, there are two main aspects to configuration:

• the simulation topology and how objects are connected
• the values used by the models instantiated in the topology

This chapter focuses on the second item above: how the many values in use in ns-3 are organized, documented, and modifiable by ns-3 users. The ns-3 attribute system is also the underpinning of how traces and statistics are gathered in the simulator.

Before delving into details of the attribute value system, it will help to review some basic properties of class ns3::Object.

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