Federated and Autonomic Management of Multimedia Services

Abstract-Over the years, the Internet has significantly evolved in size and complexity. Additionally, the modern multimedia services it offers have considerably more stringent Quality of Service (QoS) requirements than traditional static services. These factors contribute to the ever-increasing complexity and cost to manage the Internet and its services. In the dissertation, a novel network management architecture is proposed to overcome these problems. It supports QoS-guarantees of multimedia services across the Internet, by setting up end-to-end network federations. A network federation is defined as a persistent crossorganizational agreement that enables the cooperating networks to share capabilities. Additionally, the architecture incorporates aspects from autonomic network management to tackle the evergrowing management complexity of modern communications networks. Specifically, a hierarchical approach is presented, which guarantees scalable collaboration of huge amounts of selfgoverning autonomic management components

Comparative study of peer-to-peer architectures for scalable resource discovery

Resource discovery is an important aspect of many modern large-scale distributed systems. In the past, this problem has been solved using many different approaches, such as a central registry server, flooding-based protocols, and distributed hash tables. In this paper, these three widely used architectures are compared, using measurement results obtained from real implementations run on an Emulab emulation environment. This allows us to study the advantages and disadvantages of the architectures and determine their usefulness. The measurement study lead to several interesting conclusions. First, the centralised architecture incurs the least traffic overhead. However, it balances the load poorly, and introduces a single point-of-failure. Second, of the two decentralised architectures, the distributed hash table generates the least overhead. Finally, hierarchical architectures were shown to be most effective when the fraction of super-peers compared to regular peers is small

Comparative study of peer-to-peer architectures for scalable resource discovery

Resource discovery is an important aspect of many modern large-scale distributed systems. In the past, this problem has been solved using many different approaches, such as a central registry server, flooding-based protocols, and distributed hash tables. In this paper, these three widely used architectures are compared, using measurement results obtained from real implementations run on an Emulab emulation environment. This allows us to study the advantages and disadvantages of the architectures and determine their usefulness. The measurement study lead to several interesting conclusions. First, the centralised architecture incurs the least traffic overhead. However, it balances the load poorly, and introduces a single point-of-failure. Second, of the two decentralised architectures, the distributed hash table generates the least overhead. Finally, hierarchical architectures were shown to be most effective when the fraction of super-peers compared to regular peers is small.Resource discovery is an important aspect of many modern large-scale distributed systems. In the past, this problem has been solved using many different approaches, such as a central registry server, flooding-based protocols, and distributed hash tables. In this paper, these three widely used architectures are compared, using measurement results obtained from real implementations run on an Emulab emulation environment. This allows us to study the advantages and disadvantages of the architectures and determine their usefulness. The measurement study lead to several interesting conclusions. First, the centralised architecture incurs the least traffic overhead. However, it balances the load poorly, and introduces a single point-of-failure. Second, of the two decentralised architectures, the distributed hash table generates the least overhead. Finally, hierarchical architectures were shown to be most effective when the fraction of super-peers compared to regular peers is small.C