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Cisco uBR10012 Universal Broadband Router Troubleshooting Guide
OL-1237-01
Chapter 3 Troubleshooting PRE-1 Modules
Ethernet Connection Problems
Ethernet Connection Problems
If the management Fast Ethernet interface (F0/0/0) on the PRE-1 fails to work properly, and the
corresponding Link LED is not lit (steady green):
• Visually check that an Ethernet cable is connected to the correct Ethernet port on the
Cisco uBR10012 router.
• Verify that you are using the correct type of cable for a 100BaseT Ethernet.
• Check to see if the cable is bad or broken.
• Make sure the primary PRE-1 module booted up properly by checking the Status LED on its
faceplate. This LED on the primary PRE-1 module should be steady green. If a redundant PRE-1
module is installed, its STATUS LED should be flashing green. If this is not the case with either
PRE-1 module, remove and reinsert the module and boot it up again.
Note The show interface command also shows that there is an Ethernet interface (E0/0/0) on the PRE-1
module, but this is an internal interface that the router uses to communicate between PRE-1 modules and
line cards. This Ethernet interface is not configurable and can be used only by the router’s internal
subsystems.
If the Link LED is lit (steady green), but the Ethernet port is not working properly, make sure that the
port in question is configured properly and is not administratively shut down. If you have a working
console connection, perform the following steps:
Step 1 At the switch prompt, enter show interface fastethernet0/0/0. If the port is administratively down, enter
these commands to enable it:
c10000# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
c10000(config)#interface fastethernet0/0/0
c10000(config-if)# no shut
c10000(config-if)# exit
c10000(config)# exit
c10000#
The PRE-1 initializes, but you cannot
establish a console connection
1. Ensure that the terminal settings are properly set.
2. If you still cannot connect, check the console cable. Is it firmly connected? Is it
the correct type of cable with proper connectors?
3. If the cable checks out and you cannot establish a console or Telnet session,
reinsert the PRE-1 module. If the problem persists, replace the PRE-1 module.
4. Enter show log to review console messages recorded in the system log.
Card cannot be fully inserted into its
slot
Make sure that you are using the correct slot (A or B) for the PRE-1 module.
An alarm LED is lit
1. Enter the show facility-alarm status command and examine the output to
determine which system component raised the alarm.
2. Troubleshoot using a procedure appropriate to the module or FRU responsible for
the alarm.
Table 3-2 PRE-1 Module Fault Indications and Recommended Action