It tells the router what to do at boot-up time.
The meanings of the config register -
Bit No. Hex Meaning
00-03 0000 - 000F Boot Field
0000 Stay at bootstrap prompt
0001 Boot system image on EPROM
0002 - 000F Specify default netboot filename -
cisco<n>-processor_name - where 2<n<15
6 0040 Ignore NVM Contents
7 0080 OEM bit enabled
8 0100 If set (default) a Break command forces
system into bootstrap monitor mode
10 0400 If cleared (default) all 1's equals broadcast,
if set all 0's are used for broadcasts
11-12 0800 - 1000 Console Line Speed - 9600 if not set
0800 4800
1000 1200
1800 2400
13 2000 Boot default ROM software if network boot fails
14 4000 If set use the net address with broadcasts, if
cleared use all ones/zeros
15 8000 Enable dignostic messages and ignore NVM
contents
Bit 14 Bit 10 Broadcast Address
Off Off <Ones><Ones>
Off On <Zeros><Zeros>
On On <Net><Zeros>
On Off <Net><Ones>
So, 0x2102 =
2 - Boot from ROM if network boot fails
1 - Break command during boot puts router into ROMMON mode
02 - Default file name for a net boot is cisco2-<processor_name>
depending on what machine you have.
>
>Can someone explain to me what I configuration register is and what it
>is used for - it, of course, shows up on a show version command - I did
>some looking around on CCO and all the information I found said to set
>it when you upgrade the IOS to 0x2102 but I can't seem to find out what
>it does or how it does it.
>
>Thanks!
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