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
•Automatic Power Supply Shutdown
•For More Information
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
•Voltage of AC or DC Power Supplies Is Out of Tolerance
•Power Supply Is Removed
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.
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:
•AC input range: 85 VAC to 264 VAC
•DC input range: -40.5 VDC to -72 VDC
Note 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 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.
For More Information
For more information about the topics discussed in this chapter, see the following documents: