Communication apparatus detecting abnormaility by communicating an effectiveness notification
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United States of America Patent
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Aug 12, 2014
Grant Date -
Aug 19, 2010
app pub date -
Oct 13, 2009
filing date -
Oct 15, 2008
priority date (Note) -
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Abstract
When communication is performed with the upstream and downstream sides being defined in the order of relay apparatuses, the relay apparatuses each transmit a keepalive message representing that they are effectively performing communication. When no keepalive message can be received from the relay apparatus and an abnormality is detected thereby, the relay apparatus transmits a keepalive message including abnormality information representing that the abnormality is detected. By receiving the keepalive message including the abnormality information, the relay apparatus detects the abnormality on the upstream side, changes a communication path, and transmits a master candidate notification to the relay apparatus on the downstream side in order that the relay apparatus itself becomes a master.
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