Connectivity checking of a bidirectional circular path in a communication network

摘要

It is disclosed a method for checking connectivity of a bidirectional circular path provided in a communication network comprising a number of nodes connected according to a ring topology. The bidirectional circular path comprises two counter-rotating unidirectional circular paths. The nodes are provided with topology information relating to the communication network. One of the nodes generates a connectivity check packet comprising a TTL field, sets its value based on the topology information, transmits the connectivity check packet along one of the two counter-rotating paths and receives it at the opposite side from the same path. In response to the connectivity check packet, the node generates a connectivity check response packet comprising a TTL field, sets its value based on the topology information and transmits the connectivity check response packet along the other counter-rotating path.