Hi every body!
I have few questions
My book says:
config-register 0x2100 tells router to boot into rmmon mode.
config-register 0x2101 tells router to boot into rx boot mode.
Config-register 0x210x where x is 2---f
tells router to load full featured ios.The router reads startup-config looking for boot system command which will in turn guides the router how to load ios.
while researching on google, i came across a link that says " config-register 0x2142" instructs the router to load ios and ignore the nvram.
But the book says for any value 2-f in boot field means router checks the startup--config for boot system command to load ios. But the link says 2142 means load the ios and ignores the startup-config.
thanks a lot!
Here's a good link that shows all the config-register values and what they do.
the config-register 0x2142 is the special value to be used for password recovery.
Also notice that the digits are hex digits so the 4 here is not in the less meaning 4 bits.
So there is no contradiction values among 2-F are meant in the least significant digits (=the last hex digit).
A very important point is the 1 in the second position:
if you put a zero there the router can dump to rommon by simply removing the console cable !
It happened to me recently in a 2620XM that I was prepearing for an installation.
this bit should be the one that inhibits this behaviour not desirable in a production router.
Hope to help