Troubleshooting Ethernet Connections - Cisco Universal Broadband Router uBR10012 Hardware Installation Manual

Troubleshooting Ethernet Connections

Table 4-1 General Troubleshooting Tips (continued)
Symptom
System experiences a major
alarm (Major LED on the
PRE is on)
System experiences a minor
alarm (Minor LED on the
PRE is on)
You cannot establish a
console or Telnet connection
to the system.
Fan failure
System overheats
Troubleshooting Ethernet Connections
If an Ethernet connection to your Cisco uBR10012 router fails to work properly, and the corresponding
LNK (Link) LED is not illuminated, check for the following problems:
•
•
•
•
•
Cisco uBR10012 Universal Broadband Router Hardware Installation Guide
4-4
Steps to Take
Enter the show facility-alarm status command at the console.
Enter the show facility-alarm status command at the console.
For information about troubleshooting Ethernet connections, see the
Ethernet Connections" section on page
For information about troubleshooting the console port serial connections, see the
"Troubleshooting the Console Port Serial Connection" section on page
Perform the following if the fan failure LEDs illuminate:
Reseat the fan assembly module (see the
•
Module" section on page
• Remove the rear safety cover and be sure that the fan assembly module cable is connected
securely (see the "Removing and Replacing the Fan Assembly Module" section on
page 5-6).
This may be due to a failure in the fan assembly module (see Fan Failure above), insufficient
ventilation, or high ambient temperature. See the
section on page 4-14 for additional information.
Visually check that an Ethernet cable is connected to the correct Ethernet port on the PRE, and that
the other end of the cable is connected to an Ethernet hub that is powered on and functioning
properly.
Check to see if you are using the correct type of cable. The cable must meet the specifications given
in the "Connecting to a 10Base-T Ethernet Network" section on page
The cable might be bad or broken. Replace the cable with a known, reliable straight-through
Ethernet cable, checking to be sure the LNK LED comes on (green).
If the LNK LED is still not illuminated, it is possible that the Ethernet port might be functioning
–
properly, but the LED is not working. Check the Ethernet port (by trying to ping over it, for
example) to determine if the problem is due to a bad LED or if the Ethernet link is bad.
Make sure the PRE has booted up properly as follows:
The Status LED should be illuminated (green).
–
– If the Fail LED is illuminated (yellow), refer to
page 4-13.
Check the hub:
Is the cable connected into the correct hub port (for example, the hub LED is illuminated, but
–
the LNK LED on the PRE is not illuminated).
4-4.
"Removing and Replacing the Fan Assembly
5-6).
"Troubleshooting the Cooling Subsystem"
Troubleshooting the Processor Subsystem,
Chapter 4 Troubleshooting the Installation
"Troubleshooting
4-5.
3-53.
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