Fault Detection And Management; Power Supply Redundancy; Ac Power Redundancy - Cisco ASR 9000 series Reference Manual

Chapter 3 High Availability and Redundant Operation
to be restarted without impacting other components and with minimal or no disruption of traffic. Usually
any time a process fails, crashes or incurs any faults, the process restarts itself. For example, if a Border
Gateway Protocol (BGP) or Quality of Service (QoS) process incurs a fault, it restarts to resume its
normal routine without impacting other processes.

Fault Detection and Management

The Cisco ASR 9000 Series provides rapid and efficient response to single or multiple system
component or network failures to minimize service outage. When local fault handling cannot recover
from critical faults, the system offers robust fault detection, correction, failover, and event management
capabilities.
•
•
•
•

Power Supply Redundancy

The Cisco ASR 9000 Series Routers are configured in such a way that a power module failure or its
subsequent replacement does not cause a significant outage.
A power supply failure or over/under voltage at the output of the power supply is detected and an alarm
raised.

AC Power Redundancy

The AC power modules are a modular design allowing replacement without any outage. Each shelf
houses up to three power modules. Minimum and maximum module configurations are shown in
Figure
outputs 3000 W.
AC power redundancy for the Cisco ASR 9010 Router requires two power shelves.
Note
OL-17501-01
D R A F T — C I S C O C O N F I D E N T I A L
Fault detection and correction - In hardware, the ASR 9000 offers error correcting code
(ECC)-protected memory. If a memory corruption occurs, the system automatically restarts the
impacted processes to fix the problem with minimum impact. If the problem is persistent, the
ASR 9000 supports switchover and online insertion and removal (OIR) capabilities to allow
replacement of defective hardware without impacting services on other hardware components in the
system.
Resource management - As part of its fault-handling capabilities, the ASR 9000 supports resource
threshold monitoring for CPU and memory utilization to improve out of resource (OOR)
management. When threshold conditions are met or exceeded, the system generates an OOR alarm
to notify operators of OOR conditions. The system then automatically attempts recovery, and allows
the operator to configure flexible policies using the embedded event manager.
Online diagnostics - the Cisco ASR 9000 Series provides built-in online diagnostics to monitor
functions such as network path failure detection, packet diversion failures, faulty fabric link
detections, etc. The tests are configurable through the CLI.
Event management - The Cisco ASR 9000 Series offers mechanisms such as fault-injection testing
to detect hardware faults during lab testing, a system watchdog mechanism to recover failed
processes, and tools such as the Route Consistency Checker to diagnose inconsistencies between the
routing and forwarding tables.
3-1. At least one fully loaded AC shelf is required to power a fully loaded system. Each module
Cisco ASR 9000 Aggregation Services Router Overview and Reference Guide
Power Supply Redundancy
3-3