E-3
Cisco 7200 VXR Installation and Configuration Guide
OL-5013-02
Appendix E Configuration Register Information for the Cisco uBR7200 Series Universal Broadband Routers
Configuration Bit Meanings
in ROMmon. If bit 13 is not set, the router will continue to netboot images indefinitely. The default
setting for bit 13 is 0. If bit 13 is set, the system boots the boot helper image found in boot flash memory
without any retries.
The server creates a default filename as part of the automatic configuration processes. To form the boot
filename, the server starts with Cisco and links the octal equivalent of the boot field number, a dash, and
the image name.
Table E-3 lists the default boot filenames or actions.
Note A boot system configuration command in the router configuration in NVRAM overrides the default
netboot filename.
Bit 6
Bit 6 causes the system software to ignore nonvolatile random-access memory (NVRAM) contents.
Bit 7
Bit 7 enables the OEM bit. It disables the bootstrap messages at startup.
Bit 8
Bit 8 controls the console Break key. Setting bit 8 (the factory default) causes the processor to ignore the
console Break key. Clearing bit 8 causes the processor to interpret Break as a command to force the
system into the bootstrap monitor, halting normal operation. A Break can be sent in the first sixty
seconds while the system reboots, regardless of the configuration settings.
Ta b l e E-3 Default Boot Filenames
Action/File Name Bit 3 Bit 2 Bit 1 Bit 0
Bootstrap mode 0 0 0 0
ROM software 0 0 0 1
Flash software 0 0 1 0
cisco3-< image-name1> 0 0 1 1
cisco4-<image-name2> 0 1 0 0
cisco5-<image-name3> 0 1 0 1
cisco6-<image-name4> 0 1 1 0
cisco7-<image-name5> 0 1 1 1
cisco10-<image-name6> 1 0 0 0
cisco11-<image-name7> 1 0 0 1
cisco12-<image-name8> 1 0 1 0
cisco13-<image-name9> 1 0 1 1
cisco14-<image-name10> 1 1 0 0
cisco15-<image-name11> 1 1 0 1
cisco16-<image-name12> 1 1 1 0
cisco17-<image-name13> 1 1 1 1
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