Patent ID: 9191221
Filing Date: 2015-11-17
Classification: H04L

Abstract:
1. A method of protecting a point-to-multipoint primary tree in a connected mode communications network set up from a primary root node to leaf nodes in an event of a fault affecting the primary root node by way of a back-up tree between a back-up root node and at least one merge node downstream from the back-up root node, said at least one merge node belonging to a branch of the primary tree downstream from the primary root node, said method including the following steps executed by said at least one merge node: receiving a request to set up the back-up tree sent by the back-up root node; and configuring a routing rule in a table, which is used to route packets coming from the back-up tree to branches of the primary tree downstream from said merge node; wherein the set-up request comprises an identifier of the protected primary root node and said routing rule is activated only in the event of a fault affecting the identified primary root node; and wherein packets are received by said at least one merge node from both the primary tree and the back-up tree, before the routing rule is activated.