Cisco uBR10-LCP2-MC16E Guía de instalación descargar pdf (Pagina 36)

Solving Startup Problems by Using a Subsystems Approach

Because a startup problem is usually caused by a single component, it is more efficient to isolate the problem to a subsystem

rather than troubleshoot each component in the system. For these troubleshooting procedures, consider the following

subsystems:

• Power subsystem—Includes the power supplies (DC PEMs or AC PEMs) and the external power cables

• Processor subsystem—Includes the PRE processor card and TCC+ card

• Cooling subsystem—Includes the fan assembly

• Card subsystem—Includes the cable interface cards and uplink cards, and cabling

Troubleshooting Tips

For more information, refer to the troubleshooting section of the Cisco uBR10012 Hardware Installation Guide at the following

URL:

http://www.cisco.com/univercd/cc/td/doc/product/cable/ubr10k/ubr10012/hig/u10ktrb.htm

You can use the show environment command to display the general health of the power system. For additional tips, see

Table 5.

Router# show environment

Temperature normal: chassis inlet measured at 29C/84F

Temperature normal: chassis core measured at 42C/107F

Fan: OK

Power Entry Module 0 type DC status: OK

Power Entry Module 1 type DC status: OK

Router#

Table 5 Troubleshooting Tips

Symptom Action

System fails to power on Check that all the power cords are properly connected to the router and at the

power source.

1. The DC PEM power switches are turned on and the POWER LED is on (green).

2. The AC PEM power switches are turned on and the POWER LED is on (green).

3. The fan module is fully inserted, and the FANS OK LED is on (green).

System fails to boot up properly If the system has power, check the FAIL LED on the PRE and any information on

the alphanumeric display.

You cannot establish a console or Telnet

connection to the system.

1. Verify that you have the correct cable (cross connect).

2. Verify that the Ethernet cable is connected to the correct port on the PRE and

the hub.

3. Make sure that the PRE has booted properly.

Ethernet port is not configured properly. If you have a working console connection, perform the following steps:

1. At the router prompt, enter show int fast0/0/0. If the port is

administratively down, enter these commands to enable it:

switch> configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

router(config-if)# int fast0/0/0

router(config-if)# no shut

router(config-if)# exit

router(config)# exit

router#

2. Check that the Ethernet port in question has a valid IP address assigned to it.

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