Computer communication has been going through major changes throughout the last decades. Since TCP/IP was a protocol designed for wired networks, wireless transmission poses unique challenges to the well-defined and rigid protocol stack. Routing in ISP environment is challenging the clear path when the IP link was failure. In this paper, a Cross-layer approach is used to minimize routing disruption in IP networks. A model called probabilistically correlated failure (PCF) model was developed to quantify the impact of IP link failure on the reliability of backup paths. In PCF model, an algorithm is used to choose multiple reliable backup paths to protect each IP link. When an IP link fails, its traffic is split onto multiple backup paths to ensure that the rerouted traffic load on each IP link does not exceed the usable bandwidth. To evaluate this issue, the system has to be developed with real ISP service in particular network topology support. Entire path is initially used to select specific path, then backed up path are reused and tested by splitting entire bandwidth based on usage. The probability result will ensure the reliability and dedicated path of data transfer purpose. This kind of approach resolve the issue rose at high end data transaction application like VOIP, Video streaming etc.