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Cisco ASR 1000 Series Aggregation Services Routers Hardware Installation Guide
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Appendix C Troubleshooting Initial Startup Problems
General Troubleshooting Tips
Troubleshooting Using a Subsystem Approach
To solve a system problem, try to isolate the problem to a specific subsystem. Compare current router
behavior with expected router behavior. Because a startup issue is usually attributable to one component,
it is most efficient to examine each subsystem, rather than trying to troubleshoot each router component.
For troubleshooting purposes in this chapter, the router consists of the following subsystems:
•
Power subsystem—Includes the following components:
AC input or DC input power supplies, also called power entry modules (PEMs).
•
Processor subsystem—The Cisco ASR 1000 series RP, ESPs, and SIPs have onboard processors.
The RP downloads software to each board in the system over the Ethernet Out of Band Channel
(EOBC). There is a status LED on each board (RP, ESP, SIP) that indicates the progress of loading
software. Note that on routers such as the Cisco ASR 1001 Router and the Cisco ASR 1002-X
Router that have an integrated route processor, embedded services processor, and SIP, there is a
single status LED to show the loading status of the system. The LED is red if ROMMON does not
boot. If the board has booted ROMMON successfully, the LED is yellow. If operation software
(IOS) has downloaded successfully, the LED is green.
•
Cooling subsystem—Consists of three fans in each of the Cisco ASR 1006 Router and Cisco ASR
1004 Router power supplies and two fans in each of the Cisco ASR 1002 Router, Cisco ASR 1002-F
Router, and Cisco ASR 1002-X Router power supplies. On the Cisco ASR 1001 Router, each PEM
has its own fan and the system itself has a separate fan tray. The fans draw in air from each of the
chassis and PEMs in a front to back direction.
Normal Router Startup Sequence
You can generally determine when and where the power supply failed during the startup sequence by
checking the status LEDs on the power supply modules.
In a normal router startup sequence, the following sequence of events and conditions occur:
1.
The fan in each PEM receives power and begins drawing air through the power supply. The power
supply PWR OK indicator is on and reflects power supply status.
2.
As the power on and boot process progresses for the Cisco ASR 1000 Series RPs, ASR 1000 ESPs,
and each installed SIP, the status of each card is indicated by LEDs. On routers that have an
integrated route processor, embedded services processor, and SIP, the status LED shows the status
of the process.
