A 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   Set max number of continuous warm reboots
uptime  Set the uptime after which warm reboot is safe in case of a crash
<cr>

To confirm if warm-boot is active, use the command “show warm-reboot”. You can also test it by issuing a “reload warm”.  See below:

R1#show warm-reboot
Warm Reboot is enabled
Maximum warm reboot count is 5
Uptime after which warm reboot is safe in case of a crash is 5 (min)

Warm reboot can take place only after the next power cycle or reload.
R1#
So we reload the routers, after that,
R1#show warm-reboot
Warm Reboot is enabled
Maximum warm reboot count is 5
Uptime after which warm reboot is safe in case of a crash is 5 (min)

Statistics:

0 warm reboots due to crashes and 0 warm reboots due to requests have taken
place since the last cold reboot
2422 KB taken up by warm reboot storage

R1#
R1#reload warm
Proceed with reload? [confirm]

*Jun 24 18:09:35.135: %SYS-5-RELOAD: Reload requested by console. Reload Reason: Reload Command.
Smart Init is disabled. IOMEM set to: 10

Using iomem percentage: 10

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Use, duplication, or disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software – Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.

cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134-1706

Cisco IOS Software, 2800 Software (C2800NM-ADVENTERPRISEK9-M), Version 12.4(7a), RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2006 by Cisco Systems, Inc.
Compiled Tue 25-Apr-06 04:00 by ssearch
Image text-base: 0x400A2B6C, data-base: 0x42FA0000

This product contains cryptographic features and is subject to United
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use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

Cisco 2811 (revision 49.46) with 237568K/24576K bytes of memory.
Processor board ID FTX1009C5KL
2 FastEthernet interfaces
4 Serial(sync/async) interfaces
1 Virtual Private Network (VPN) Module
DRAM configuration is 64 bits wide with parity enabled.
239K bytes of non-volatile configuration memory.
62720K bytes of ATA CompactFlash (Read/Write)
Press RETURN to get started!

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