System and method for crash handling on redundant systems
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United States of America Patent
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Sep 24, 2002
Grant Date -
N/A
app pub date -
Apr 19, 1999
filing date -
Apr 19, 1999
priority date (Note) -
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Abstract
The present invention relates to providing processor redundancy in a system such as a router. According to an embodiment of the present invention, when a primary processor is about to crash in a system having two or more processors, the imminent crash is identified prior to the occurrence of the actual crash. The primary processor sends a message to the secondary processor to indicate that it is crashing. The primary also sets a timer to determine a period of time to wait prior to crashing. When the secondary processor receives the message from the primary processor, the secondary processor becomes the new primary processor. The new primary processor then sends an acknowledgement to the old primary processor. The old primary processor crashes and reboots as the new secondary processor.
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