Keith Sinclair

← Cisco Reference

Configuration Registers

The global configuration command config-register is used to modify the behaviour of the router. Whether or not it boots from saved configuration. Whether or not it boots from the flash or the boot-proms.

Boot Register Summary

  • The value range is from 0x0 to 0xFFFF.
  • 0x2102 is the factory-default configuration register value.
  • 0x2142 boots from flash without using NVRAM contents — good for password recovery.
  • 0x2101 boots from boot prom image not flash — good for upgrading image on flash.
  • 0x2141 boots from boot prom and ignores NVRAM contents.
  • 0x141 disables the Break key, ignores the NVRAM configuration, and boots the default system image from ROM.