Currently, routing algorithms compute all the available paths in the network, from a source node to a destination node before selecting the optimal route. The route computation is often time and resource consuming. Some paths are not acceptable due to the particular geographical configuration of the...http://www.google.com.au/patents/US5491690?utm_source=gb-gplus-sharePatent US5491690 - Method and apparatus to speed up the path selection in a packet switching network
