An examination of IP/ATM cut-through forwarding in dynamically routed networks

Multiprotocol over ATM (MPOA), IP switching and multiprotocol label switching (MPLS) have distinctly different mechanisms for cut-through packet forwarding. MPOA and IP switching use flow-based cut-through (FBC) forwarding while MPLS uses routing table linked cut-through forwarding (TLC). This paper examines the sensitivity of each these cut-through forwarding mechanisms to changes in underlying routing tables. We examine a scenario where a congestion-sensitive dynamic routing protocol, such as OSPF optimised multipath, leads to frequently changing routing tables. We show that FBC forwarding reacts significantly worse than flow length distributions predict, taking up to 1200 seconds to react to route changes and forward at least 50% of packets on the new route. Flow characteristics are examined to determine ways to improve FBC sensitivity. We show that implementing a maximum flow length of 200 seconds improves the response to route changes significantly with a minimal decrease in the number of switched packets (1.5%)

IP and ATM - a position paper

This paper gives a technical overview of different networking technologies, such as the Internet, ATM. It describes different approaches of how to run IP on top of an ATM network, and assesses their potential to be used as an integrated services network

IP forwarding alternatives in cell switched optical networks

Optical switching will enable core Internet packet switching to scale with future transmission rate increases. Currently proposed optical ATM switches do not allow packet reassembly, which is necessary for packet level forwarding. This results in the requirement to create end to end ATM virtual connections for flows even if they contain only one packet. In electronically switched networks MPOA and MPLS allow both cell and packet level forwarding to overcome this problem. This paper examines the feasibility of implementing such protocols over an optically switched network. Two different architectures are examined: use of an adjunct electrical router; and native optical packet reassembly. An examination of the optical reassembly buffer requirements show that the use of MPLS will require significantly more buffering than MPOA

DSL-based triple-play services

This research examines the triple play service based on the ADSL technology. The voice over IP will be checked and combined with the internet data by two monitoring programs in order to examine the performance that this service offers and then will be compared with the usual method of internet connection.This research examines the triple play service based on the ADSL technology. The voice over IP will be checked and combined with the internet data by two monitoring programs in order to examine the performance that this service offers and then will be compared with the usual method of internet connection.

ATM interworking unit with ISDN and ethernet interfaces

The convergence of telecommunications and computer communication technologies requires the development of Interworking Units to convert different data formats, protocols and control procedures. This paper describes the architecture of an electronic device, which is able to perform interworking functionalities between ATM, ISDN and Ethernet networks and presents several scenarios for interconnection environments

Multi-protocolos sobre ATM, interoperabilidade e gerência: um estudo de caso

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Computação.Este trabalho consiste no estudo e na realização de experimentos com o Multi-Protocolo sobre ATM. São apresentados testes de interoperabilidade entre equipamentos com suporte a MPOA de diferentes fabricantes. Nos experimentos de conformidade as características dos equipamentos são confrontadas com as declarações de conformidade da implementação do protocolo MPOA. Para mostrar os benefícios do MPOA, foi implementado um ambiente de teste especifico para realizar experimentos de avaliação de desempenho em ambientes

Avaliação de desempenho de comutadores ATM /

Dissertação (Mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico