Problem:

How to identify configuration registers on Cisco IOS


Solutions:


0×102
Ignores break, 9600 baud
0×1202
1200 baud
0×2101
Boots into bootstrap, Ignores break, Boots into ROM if initial boot fails, 9600 baud
0×2102
Ignores break, boots into ROM if intial boot fails, 9600 baud default for most platforms
0×2120
Boots into ROM, 19200 baud
0×2122
Ignores break, boots into rom if initial boot fails, 19200 baud
0×2124
Netboot, ignores break, boots into ROM if initial boot fails, 19200 baud
0×2142
Ignores break, boots into ROM if initial boot fails, 4800 baud
0×2922
Ignores break, boots into ROM if initial boot fails, 38400 baud
0×3122
Ignores break, boots into ROM if initial boot fails, 57600 baud
0×3902
Ignores break, boots into ROM if initial boot fails, 115200 baud

To find your configuration register just type (funny one): show ver | include ion_reg

To set it from IOS just type in global config mode: config-register <new register>