The primary goals of our experiments were to understand the characteristics of the protocol with respect to three properties:
Main functionality: does the protocol deliver messages to nodes that are interested in them?
Traffic filtering: does the protocol prevent unnecessary message traffic?
Protocol scalability: does the protocol produce a reasonable and stable amount of control traffic?

We use the following metrics to evaluate the efficiency of an event routing scheme: the storage, management, and computation costs at the pub-sub servers, and the network resource utilizition for event trasmission.