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Cisco uBR10012 Universal Broadband Router Troubleshooting Guide
OL-1237-01
Chapter 3 Troubleshooting PRE-1 Modules
Booting Up with Redundant PRE-1 Modules
Booting Up with Redundant PRE-1 Modules
When two PRE-1 modules are installed in the Cisco uBR10012 router, the active PRE-1 module is
whichever module that first loads the Cisco IOS software and asserts control over the shared bus between
the two modules. The other PRE-1 module automatically boots the Cisco IOS software and enters the
standby mode.
Typically, the PRE-1 module in slot A (the left-most PRE-1 module slot as you face the chassis) boots
the Cisco IOS software more quickly than the PRE-1 module in slot B (the PRE-1 slot on the right). This
is because the PRE-1 module in slot B adds a slight delay in its bootup sequence, so as to allow the
module in slot A to boot first.
However, the selection of the active PRE-1 module does not affect the operations of the Cisco uBR10012
router. The router can operate normally with either the slot A or the slot B PRE-1 module acting as the
active PRE-1 module.
If you notice that the slot B PRE-1 module is always becoming the active PRE-1 module, and you would
like the slot A PRE-1 module to become the active PRE-1 module, check for the following:
• Check to see if the slot A PRE-1 module is booting Cisco IOS software from a Flash Disk in slot0
or slot1, which indicates it is using an old-style 16 or 20 MB PCMCIA card. These Flash Disk
memory cards operate more slowly than the new ATA-style 48 MB, 64 MB, or 128 MB Flash Disk
cards. If possible, boot the PRE-1 module using an ATA-style card in disk0 or disk1.
• If using an ATA-style Flash Disk is not possible, consider booting the Cisco IOS software image
from the PRE-1 module’s bootflash memory device.
IOS DRVR The Cisco IOS software is initializing the driver subsystems.
IOS LIB The Cisco IOS software is initializing the subsystem libraries.
IOS PROT The Cisco IOS software is initializing the protocol subsystems.
IOS MGMT The Cisco IOS software is initializing the management subsystems.
IOS INTF The Cisco IOS software is initializing the router’s interfaces.
IOS CONF The Cisco IOS software has begun to load the startup configuration file.
IOS RUN The Cisco IOS software is running and the PRE-1 module is running as the
active PRE-1 module. This could indicate that the PRE-1 module originally
booted up as the active module, or that a switchover put this module into the
active state.
Note This message indicates that the Cisco IOS router is running a Cisco IOS
software image. This is typically the full Cisco IOS image that was
found on a Flash disk or TFTP server. However, if an error occurs during
bootup, this could be the boot Cisco IOS image that is permanently
written in the router’s bootflash and is used when the router cannot boot
the full Cisco IOS image.
IOS STBY The Cisco IOS software is running and the PRE-1 module is running as the
standby PRE-1 module. This could indicate that the PRE-1 module originally
booted up as the standby module, or that the PRE-1 module was originally the
active PRE-1module, but that a switchover put it into the standby state.
Table 3-1 LED Messages on the PRE-1 Modules (continued)
Message Description