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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.
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 the packets continuously during period of convergence. PTR scheme pre-establishment 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 yet troubleshooting linkages. The performances of PTR scheme are simulated. BGP. The cost caused by PTR scheme is very little and acceptable.