Improving the Connectivity of Multi-providers Network with Protected Tunnel

Maintaining connectivity is a key responsibility of any routing system, but successfully carrying it out can be challenging, especially for inter-domain paths. Many measurements indicate the links failures are fairly common in the Internet. During the period of failures, some destination would be unreachable and the corresponding services unavailable. Shrinking the convergence time window to improve connectivity of destination may cause routing instability when the majority of failures are transient. To improve failure resiliency without jeopardizing routing stability, we propose a fast reroute approach, called PT, which works by pre-established protected tunnel to react quickly to multi-providers network link failures so as to perform non-stop routing. Through simulation we demonstrate that PT is more resilient to multi-providers network link failures and the scale of exchanged messages is acceptable.