| dc.description.abstract | Recently, the technology of multicast services in MPLS networks has been put importance gradually, and the related standards and researches have been proposed continually. In future network, applications of the multicast technology over MPLS networks architecture will be a mainstream, however, the fault recovery mechanism has not been developed relatively. Once nodes failure or links failure occurs, the technique of layer 3 rerouting is the only solution. Nevertheless, it takes too much time to repeat examining header, and this is an obstacle to real time services.
The recovery model, which pre-establishes backup paths and be classified into global restoration and local restoration. In global restoration, recovery of node failures and link failures between the root and the leaf uses the same backup path. On the other hand, local restoration uses different backup paths.
In this paper, we propose quick recovery mechanisms for node failures and link failures of multicasting services on the MPLS networks. In addition, through the transformation of BR factor, we select the balance point, which is faster and waste less bandwidth of pre-established backup paths. In BR factor, the denominator is the bandwidth utilization of backup paths, and the numerator of BR factor is recovery time. Simulation results show that our algorithms can obtain the best ratio between the bandwidth utilization and the recovery time in each local restoration algorithm. | en_US |