The deflection routing protocol is an effective contention resolution in Optical Burst Switching network, However, it can worsen loss performance of non-deflected burst on the deflection route. To improve the burst lo...The deflection routing protocol is an effective contention resolution in Optical Burst Switching network, However, it can worsen loss performance of non-deflected burst on the deflection route. To improve the burst loss performance, a limited deflection routing scheme based on burst loss threshold is proposed to prevent injudicious deflection routing. By using threshold check function, it restrainedly allows the deflected burst to preemptive network resource, consequently, improve the QoS performance of non-deflected burst. Simulation results show that the scheme can efficiently prevent deflected burst contending with non-deflected burst on deflection route, and effectively improve the burst loss performance of entire networks.展开更多
It is well-known that today's inter-domain routing protocol, Border Gateway Protocol (BGP), converges slowly during network failures. During the convergence period, widespread tempo-rary burst packet loss happens ...It is well-known that today's inter-domain routing protocol, Border Gateway Protocol (BGP), converges slowly during network failures. During the convergence period, widespread tempo-rary burst packet loss happens that may be caused by route loops or blackholes. In this paper, we present a Protection Tunnel based Rerouting (PTR) mechanism-a novel scheme for delivering packet continuously during period of convergence. PTR scheme pre-establishes protection tunnel among routers. Once the inter-domain link failed, routers could redirect those influenced packets along pro-tection tunnel to a router that has a valid path to destination. Therefore, packets could be forwarded continuously even encountering fault links. The performances of PTR scheme are simulated. The results demonstrate that PTR scheme is more resilient to link failures than BGP. The cost caused by PTR scheme is very little and acceptable.展开更多
基金This workis supported by project of National Science Foundation of China (No.90304004) , National"863"Project Plan (No.2005AA122310) , Keyproject of Science and Technology of National Education Department (No.204125) , project of Science Foundation of Chongqing Science and Technology Commission(No.2005BB2062) , Youth Science and Technology Grant of CQUPT(No.A2005-28) .
文摘The deflection routing protocol is an effective contention resolution in Optical Burst Switching network, However, it can worsen loss performance of non-deflected burst on the deflection route. To improve the burst loss performance, a limited deflection routing scheme based on burst loss threshold is proposed to prevent injudicious deflection routing. By using threshold check function, it restrainedly allows the deflected burst to preemptive network resource, consequently, improve the QoS performance of non-deflected burst. Simulation results show that the scheme can efficiently prevent deflected burst contending with non-deflected burst on deflection route, and effectively improve the burst loss performance of entire networks.
基金Supported by the Major State Basic Research Development Program(No.2007CB307102)the State High Technology Research Development Program(No.2009AA01A346)
文摘It is well-known that today's inter-domain routing protocol, Border Gateway Protocol (BGP), converges slowly during network failures. During the convergence period, widespread tempo-rary burst packet loss happens that may be caused by route loops or blackholes. In this paper, we present a Protection Tunnel based Rerouting (PTR) mechanism-a novel scheme for delivering packet continuously during period of convergence. PTR scheme pre-establishes protection tunnel among routers. Once the inter-domain link failed, routers could redirect those influenced packets along pro-tection tunnel to a router that has a valid path to destination. Therefore, packets could be forwarded continuously even encountering fault links. The performances of PTR scheme are simulated. The results demonstrate that PTR scheme is more resilient to link failures than BGP. The cost caused by PTR scheme is very little and acceptable.
