Redundancy and Availability Features
▀ Mean Time Between Failure and System Availability
▄ Cisco ASR 5000 Series Product Overview
System Availability
System-level Mean Time To Failure (MTTF), is the average interval of time that a component will operate before
failing. Reliability information is based on the number of overall anticipated failures of the individual components, in
conjunction with any redundancy schemes employed to minimize the impact of such failures.
The following table provides service availability calculations (based on reliability modeling) for the ASR 5000
platform.
Table 27. Platform Service Availability Calculations
One suggestion to help improve overall system availability is to institute an on-site spares program, wherein key
components are housed locally with the deployed equipment. The following section defines a recommended spares
program and quantities for the system.
Mean Time To Repair (MTTR) is the amount of time needed to repair a component, recover the system, or otherwise
restore service after a failure. System availability calculations are based on the industry standard of four hours.
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