Bidirectional Multi-Constrained Routing Algorithms
Technology Used: Java
QoS routing plays a critical role in providing QoS support in the Internet. Most existing QoS routing algorithms employ the strategy of unidirectional search in route selection. Bidirectional search has been recognized as an effective strategy for fast route acquisition in identifying the shortest path connecting a pair of nodes. However, its efficiency has not been well established in the context of route selection subject to multiple additive constraints, which is in general NP-Complete. To employ bidirectional search to support efficient QoS routing subject to multiple additive constraints. A k shortest path algorithm is proposed using bidirectional search. Bidirectional search can significantly accelerate the convergence of several existing QoS routing algorithms. A novel cost-effective bidirectional multi-constrained routing algorithm is proposed, which can greatly alleviate the forwarding state scalability issue by supporting stateless QoS routing in IP networks via IP tunneling or constraints based alternate routing in MPLS networks via label stacks. It has the fastest known on-line running time. Theoretical and simulation results are given to demonstrate the high performance of proposed algorithm in identifying QoS-satisfied paths and also in efficient resource utilization as compared with existing algorithms.