To use this command, you must
be in a user group associated with a task group that includes appropriate task
IDs. If the user group assignment is preventing you from using a command,
contact your AAA administrator for assistance.
register setting is a 16-bit, user-configurable value that determines
router switch processor
(RSP) functions during initialization. The configuration register can
RSP to boot normally from the default configuration, or to enter
ROMMON mode during a reload. Configuration register settings can also be used
to perform tasks such as password recovery.
The config-register command is entered in administration EXEC mode, on the designated shelf controller (DSC) of the system. The DSC is the primary RSP of the owner secure domain router (owner SDR).
When you have two RPs (Primary RP0 and Standby RP1) and the config-registers of the two are different, you must manually set the config-register in RP1 equal to RP0 in order for RP1 to synchronize with the configurations on RP0.
Use the show
boot command in the EXEC mode to see status of the config-register in both the RPs.
Use the config-registerxlocationx command in the Admin mode to change the config-register in either of the RPs.
When setting the configuration register value for the config-register command, note the following conditions:
If both the
primary and standby DSC are up and running when the configuration register
value is set, the configuration register value applies to both the primary and
if only the primary DSC is up and running when the configuration register value
is set and the standby DSC is introduced into the router at a later time, the
attempt to synchronize the configuration register value for the standby
RSP to that of the active
RSP; in this situation, the configuration register setting
applied to the standby DSC is determined by the configuration register value
set in ROMMON mode.
describes the most commonly used configuration register settings.
Table 1 Common
Configuration Register Settings
RSP enters ROMMON mode (rommon B1>) on the next system
RSP loads the
Cisco IOS XR software and default configuration on the next system boot. After
logging in, the user can access EXEC mode.
Cisco IOS XR software with the console Break key disabled on the next system
enters the password recovery mode on the next system boot.
If you use the various keywords to set the configuration
settings, note that the hexadecimal value is updated in an additive or
subtractive manner to represent the keyword used. For example, if the current
configuration setting is 0x102 and you use the
command with the
keywords, the value is updated to 0x142.