Warm Reload

This is a new feature in 12.3 that enables the router to perform a reboot using the IOS image currently running in DRAM. Having this capability greatly reduces boot time (no decompression or copying from slow flash) and reduces down-time when the router is returned to ROM by a bug. It also enables us to reboot the router even if we don’t have a valid IOS image in flash.
However, for warm-reboot to be active the router has to be cold-rebooted at least once after it’s configured.
With this command “warm-boot”, comes two options. The first is “count” which configures the maximum number of warm-reboots after which the router will perform a cold reboot. The second keyword is “uptime” which configures the time after which warm-reboot will be safe in case of a crash.


R1(config)#warm-reboot count 10


источник http://anetworkerblog.com/2007/11/04/a-warm-reload/