CH A P T E R
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Automatic Shutdown
Under certain conditions, the Cisco ASR 1000 Series Aggregation Services Router or one of its power
supplies can perform an automatic shutdown.
This chapter includes the following sections:
•
Automatic Router Shutdown, page 2-1
•
Automatic Power Supply Shutdown, page 2-2
•
For More Information, page 2-3
Automatic Router Shutdown
When the router detects a condition that could result in physical damage to system components, the
router can shut down without operator intervention. When the router shuts down automatically, the
system controller disables DC power to all internal components. All DC power remains disabled until
you toggle the power switch.
The default for automatic router shutdown is off. To allow automatic router shutdown, the facility-alarm
critical exceed-action shutdown command must be enabled. If the facility-alarm critical
exceed-action shutdown command is enabled, the router performs an automatic shutdown under the
following conditions:
•
Internal Temperature of Router or Power Supply Exceeds Temperature Threshold, page 2-1
•
Voltage of AC or DC Power Supplies Is Out of Tolerance, page 2-2
•
Power Supply Is Removed, page 2-2
Internal Temperature of Router or Power Supply Exceeds Temperature
Threshold
A temperature threshold is exceeded if any of the following conditions occur:
•
The internal temperature of the router (the ambient air temperature on the active Cisco ASR 1000
Series Route Processor) is over 100° C.
•
The internal temperature of the AC power supply is over 100° C.
•
The internal temperature of the DC power supply is over 100° C.
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Automatic Power Supply Shutdown
Note
Temperature threshold values cannot be configured or changed.
Voltage of AC or DC Power Supplies Is Out of Tolerance
The voltage of a power supply must be within certain ranges (within tolerance). A power supply is out
of tolerance if voltage is outside of the following ranges:
Note
•
AC input range: 85 VAC to 264 VAC
•
DC input range: –40.5 VDC to –72 VDC
Voltage tolerance ranges cannot be configured or changed.
Power Supply Is Removed
Two power supplies must be installed in the chassis at all times to ensure sufficient cooling. The system
fans are inside the power supply units and must spin for cooling. Because all the system fans can be
powered by one power supply, the second power supply unit does not have to be powered on, but it must
be installed.
If a power supply is removed, the system can run with only one power supply for a maximum of five
minutes. The router waits five minutes before shutting down. This five-minute window allows time to
replace a failed power supply.
Note
Caution
Two power supplies are not required but recommeneded for Cisco ASR 1001Router. An automatic 5
minute shutdown will not occur if power supply is removed for Cisco ASR 1001 Router.
If you remove a power supply, the system can run for a maximum of five minutes before the system shuts
down. The fans and power elements are independent within the power supply. Therefore, it is not
required that the replacement power supply be energized within five minutes. The only requirement is
that the power supply be installed in the chassis, which energizes the fans and maintains proper system
cooling.
Automatic Power Supply Shutdown
Automatic power supply shutdown occurs independently of a router shutdown. If the internal
temperature of a power supply exceeds 100° C, the power supply shuts down immediately. The
facility-alarm critical exceed-action shutdown command does not need to be enabled.
Each power supply fail safe is independent of the other and independent of the router. The fans in the
power supplies continue to operate as long as the second power entry module (PEM) is powering the
system.
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For More Information
For More Information
For more information about the topics discussed in this chapter, see the following documents:
Topic
Document
Command descriptions
Cisco IOS Master Command List, All Releases
Command Lookup Tool (Requires Cisco.com user ID
and password)
Environmental monitoring and reporting
“Environmental Monitoring and Reporting” section in
the “Cisco ASR 1000 Series Routers Hardware
Overview” chapter in the Cisco ASR 1000 Series Router
Hardware Installation Guide
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For More Information
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