Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Reexamination Certificate
2005-09-06
2005-09-06
Beausoliel, Robert (Department: 2113)
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
C714S013000, C370S216000
Reexamination Certificate
active
06941487
ABSTRACT:
Multiple techniques for providing failure protection in a network node that includes primary and secondary control modules (CMs) are disclosed. One technique involves synchronizing configuration state information between the CMs by executing a configuration command within the primary CM and then executing the same configuration command within the secondary CM only if executing the configuration command within the primary CM does not cause the primary CM to fail. Another technique involves gleaning table entries from hardware-based forwarding tables and using the gleaned table entries to generate a software-based forwarding table in the secondary CM. Another technique involves maintaining existing table entries in hardware-based forwarding tables after a switchover, generating orphan table entry links at the secondary CM to the existing table entries in the hardware-based forwarding tables, and then using the links to manage the existing table entries until the secondary CM can re-program the hardware-based forwarding tables.
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“High Availability for the Catalyst 6000 Family,” Cisco Systems, White Paper, Copyright 2001.
Balakrishnan Thirumalpathy
Gaonkar Ajay
Ng Eddy
Beausoliel Robert
Guyton Philip
Riverstone Networks, Inc.
Wilson Mark A.
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