Chapter 3 Troubleshooting PRE-1 Modules
Booting Up with Redundant PRE-1 Modules
Table 3-1 LED Messages on the PRE-1 Modules (continued)
Message | Description |
| |
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. |
| |
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.
Cisco uBR10012 Universal Broadband Router Troubleshooting Guide
