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...

2002-08-21

2008-03-25

Vu, Huy D. (Department: 2616)

Multiplex communications

Communication techniques for information carried in plural...

Adaptive

C370S467000, C370S400000

Reexamination Certificate

active

07349427

ABSTRACT:
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 calculates 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-tunneling between heterogeneous nodes to be taken into account when determining the short path.

REFERENCES:
patent: 5251205 (1993-10-01), Callon et al.
patent: 6195705 (2001-02-01), Leung
patent: 7099323 (2006-08-01), Doong et al.
patent: 1065848 (2001-01-01), None
Dave Katz Juniper Networks et al “Traffic Engineering Extensions to OSPF” IETF Standard-Working-Draft Jun. 30, 2001.
Christian P et al “IS-IS Automatic Encapsulation . . . ” XP015021579, Jul. 2002.
Callon Digital Equipment Corporation R “Use of OSI IS-IS for Routing in TCP/IP and Dual Environments . . . ” XP015006139, Dec. 1990.

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