As an alternative to traditional IP-layer multicast, a large number of ALM algorithms are proposed to build the overlay networks and transmit data through spanning trees over the overlay networks, but few works focus ...
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As an alternative to traditional IP-layer multicast, a large number of ALM algorithms are proposed to build the overlay networks and transmit data through spanning trees over the overlay networks, but few works focus on the congestion of spanning tree which is the key to the performance of application-layer application. This paper studies the impact of spanning trees' congestion on ALM performance. A statistical link model is introduced to describe congestion occurring in ALM networks and a dependency-degree factor is presented to express the dependence between adjacent links. Furthermore, two schemes, the Inter-level Redundant Link scheme and the Intra-level Redundant Link scheme, are proposed to enhance the resilience of ALM spanning trees against congestion. Simulation results indicate that the proposed statistical model well describes the congestion in ALM networks and both redundant link schemes significantly boost the robustness of ALM even in tough network environments.
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