In the network operator-friendly P2P traffic control technique such as P4P, peers are supposed to select their communication partners by following a guidance issued by the network operator. Thus, the guidance has significant impact on the traffic control. However, detailed performance study of available guidances is missing. Most existing approaches do not show how they affect intra-domain traffic control in detail while mostly focusing on inter-domain traffic control. In this paper, we try to understand how the guidances affect the intra and inter-domain traffic control for better guidance improving the traffic control. Through simulations, we reveal the following. The performance-based guidance reflecting the networking status shows attractive results in distributing the traffic over intra-domain links and in reducing the cross-domain traffic and the charging volume of inter-domain link compared to the distance-based guidance enforcing simple localization. However, the performance-based guidance shows one limitation that can cause unstable traffic control. To overcome the identified limitation, we propose peer-assisted measurement and traffic estimation approach. Then, we verify our approach through simulations.

This paper deals with overload control during congestion in a shared buffer ATM switch via selective cell discard and buffer management. Specifically, we consider the question of efficiency in buffer control schemes in order to reduce the number of cells that have to be discarded during congestion, in the meantime provide "fair" access to the shared buffer by all users. To prevent performance degradation of the shared buffer switch under imbalance traffic conditions, a "gated" buffer control scheme is proposed. The concept of the "gated" control policy is that we add a control gate in front of the corresponding logical queue of each overloaded output port. Some incoming cells destined for the overloaded ports can be blocked before entering the shared buffer. It will make rooms in the shared buffer for those incoming cells destined for the non-overloaded ports. This gated buffer control scheme can be modeled as a variation of SMXQ (sharing with a maximum queue length) scheme with a set of dynamically adjusted queue length thresholds. The simulation study of the gated buffer control is applied to a shared buffer ATM switch under various cell discard mechanisms. In most cases the proposed gated buffer control scheme can not only reduce the overall cell loss but also satisfy the "fair" access requirement under network congestion conditions, if we adjust the dynamical queue length thresholds properly.