Cisco IOS Resilient Configuration
The Cisco IOS Resilient Configuration feature allows for faster recovery in
situations in which an attacker has compromised a router and erased its
Cisco IOS image / configuration file. This feature is available only on platforms
with PCMCIA ATA Flash drives. When enabled, this feature saves
nonerasable copies of the running Cisco IOS image and running configuration
to the Flash drive. If the configuration / Cisco IOS image is then erased,
the secure backup copy of the Cisco IOS image can be booted from
ROMMON. After the boot, you can restore the secure backup copy of the
configuration from the Flash drive.