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Conclusion

Link failure is a common cause of service disruption in computer networks. Many techniques have been developed to alleviate the consequences of hardware failure in a network like the Internet by rerouting traffic from a failed link to a working or a set of working links. Rerouting is performed automatically in the Internet by recomputing routing tables. However routing convergence may be slow and faster techniques which require expensive hardware have been developed to protect networks from link failures. MPLS is a recent virtual circuit packet switching technology which has been designed to support the forwarding of IP packets over virtual circuits. MPLS Fast Reroute is a traffic engineering technique that is able to reroute IP traffic quickly without the need of additional hardware. Indeed, MPLS Fast Reroute relies on pre-planned backup path to reroute traffic on a link failure and can be implemented in existing routers.

An important delivery mode of the Internet is multicasting, where the information sent by a member of a multicast group is received by all other members of the group. A popular example of a multicasting application is teleconferencing. In real-time applications like teleconferencing, if a link failure occurs, it is crucial to repair the multicast routing tree of the multicast communication in a short time. For example, an interruption of service of more than 50 ms is noticeable in a live transmission. Establishing a backup path to protect a multicast routing tree is a resource consuming process. Therefore, it is desirable to protect a large number of members of a multicast group with a low number of backup paths. In this thesis, we presented an algorithm which is able to choose such a backup path, and the design and implementation of an MPLS-based rerouting mechanism adapted to the protection of multicast routing trees. We now review our contributions and expose possible future work.


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Next: Contributions Up: MPLS_trees Previous: Measuring the tree repair   Contents
Yvan Pointurier 2002-08-11