| US 7,567,506 B2 | ||
| Method of managing malfunctions at router level, and a router | ||
| Marc Capelle, Chilly Mazarin (France); Francois Billaut, Paris (France); and Bruno Decraene, Vanves (France) | ||
| Assigned to France Telecom, Paris (France) | ||
| Filed on Jun. 01, 2005, as Appl. No. 11/141,032. | ||
| Claims priority of application No. 04291364 (EP), filed on Jun. 01, 2004. | ||
| Prior Publication US 2005/0270971 A1, Dec. 08, 2005 | ||
| Int. Cl. H04L 12/26 (2006.01) | ||
| U.S. Cl. 370—216 [370/245] | 10 Claims |
| 1. A method of managing malfunctions in a telecommunications network, in a router that has a plurality of communication interfaces
with said network, and a nominal operational routing plan duplicated on the interfaces, wherein the method comprises, during
nominal operation:
a step of calculating at least one secondary operational routing plan for degraded modes of operation of the network; and
a step of transferring secondary plans to the interfaces;
these steps being performed prior to detecting a malfunction that creates conditions for a degraded mode of operation,
wherein, on detecting a malfunction in the network, a step is provided for switching the interfaces from the nominal plan
to a secondary plan corresponding to the degraded mode of operation that results from the detected malfunction,
wherein said step of switching the interfaces comprises:
a substep of selecting a secondary operational routing plan corresponding to a degraded mode of operation that results from
a detected malfunction; and
a substep of transmitting synchronization information to cause said interfaces to switch simultaneously to said selected secondary
plan,
wherein said substep of transmitting synchronization information comprises transmitting information identifying said selected
secondary operational routing plan, and a switchover command.
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