CONNECTIVITY CHECKING OF A BIDIRECTIONAL CIRCULAR PATH IN A COMMUNICATION NETWORK
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United States of America Patent
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Issued Date -
Aug 13, 2015
app pub date -
Aug 15, 2013
filing date -
Sep 7, 2012
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Abstract
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.
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