Detecting network instability

Details Detecting network instability Detecting network instability

2005-07-12

2005-07-12

Baderman, Scott (Department: 2113)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S004110, C714S043000, C370S229000, C370S232000, C709S223000, C709S224000, C709S225000

Reexamination Certificate

active

06918067

ABSTRACT:
A method, system and computer program product for detecting conditions of network instability. An attribute indicative of network instability, e.g., processor and/or co-processor utilization, packet arrival rates, packet peak rates, packet size distribution, packet clustering tendencies, buffer usage patterns, occurrence of peak utilization, out-of-buffer conditions, packet discard rates, may be monitored for a network device, e.g., router. The monitored attribute may be associated with a plurality of labels (variables) where a portion of those labels may be stored in a cache. A hit ratio for the cache storing labels associated with the monitored attribute may be tracked within a period of time based on the number of requested items, i.e., labels, that are currently stored in the cache. A condition of network instability may then be detected based on the hit ratio by determining if the absolute value of the acceleration of the hit ratio exceeds a threshold.

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