Routing method and apparatus for optimising auto-tunnelling...

Details Routing method and apparatus for optimising auto-tunnelling... Routing method and apparatus for optimising auto-tunnelling...

H - Electricity

04

L

H04L 12/56 (2006.01) H04L 12/24 (2006.01) H04L 12/66 (2006.01) H04L 29/06 (2006.01)

Patent

CA 2437684

In the preferred embodiment, the invention provides a modified Shortest Path First routing algorithm for use in a heterogeneous network. The routing algorithm is modified to include predetermined heterogeneous characteristics of the network nodes and to take these characteristics into account when calculating the shortest paths. For example, information may be included in the algorithm which identifies heterogeneous network nodes as it oaloulates shortest paths. Once a node has been identified as heterogeneous, i.e., capable of supporting at least two protocol sets, this information is carried over into subsequent path entries created by the routing algorithm. The algorithm then uses the encapsulation capability identifier in the calculation of the shortest paths by including the cost of auto-tunnelling between heterogeneous nodes to be taken into account when determining the short path.

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