Patent ID: 9369359
Filing Date: 2016-06-14
CPC Classification: H04L

Claim Text:
1. A diagnostic system for diagnosing a network in which a transmission source node and a transmission destination node are connected via a relay node, wherein: the transmission source node is configured to generate diagnostic frames in which the number of hops that is counted until the relay node is set as a Time To Live value and the Time To Live value is stored in a predetermined field, and transmit the diagnostic frames to the relay node; and the relay node is configured to: include an input line card configured to decrement, on an input interface side of the relay node, when the diagnostic frames are received, the Time To Live value stored in the field of the diagnostic frames, count the number of diagnostic frames in which the decremented Time To Live value is 0, transfer the diagnostic frames, and output the counted number of diagnostic frames as the number of checked frames; and include an output line card configured to count, on an output interface side of the relay node, among the diagnostic frames transferred from the input line card, the number of diagnostic frames in which the decremented Time To Live value is 0, and output the counted number of diagnostic frames as the number of checked frames; and check continuity in a direction from the transmission source node to the relay node between the transmission source node and the input line card and between the transmission source node and the output line card based on the number of transmitted diagnostic frames transmitted from the transmission source node, the number of checked frames output from the input line card, and the number of checked frames output from the output line card.