Evaluation

In this section, we answer several questions relating to the practical viability of OverQoS in the wide area Internet using implementation results and measurements on a wide-area network comprising of $19$ diverse nodes. Additionally we use ns-2 based simulations [25] to answer specific questions that a wide area evaluation may not be able to address. The specific questions we address are:

1. Can OverQoS provide statistical bandwidth guarantees and loss assurances to flows? In particular:
   1. Loss Guarantees: When can a CLVL abstraction provide loss guarantees along a virtual link?
   2. Bandwidth Guarantees: What bandwidth guarantees are realizable on a virtual link?
   3. OverQoS Cost: What is the bandwidth overhead and delay cost of using OverQoS?
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2. Fairness/Stability: Is OverQoS fair to cross traffic and stable in the presence of multiple competing OverQoS networks?

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