Solved: Setting up 3945 boot system file

raghavendrasomiyani · ‎08-15-2014

Hello,

I am upgrading 3945 router. Little confused to set the boot system file.

Output from show version

System image file is "flash0:c3900e-universalk9-mz.SPA.153-1.T1.bin"
Last reload type: Normal Reload
Last reload reason: power-on

R1(config)#boot system ?
WORD       TFTP filename or URL
flash      Boot from flash memory
flash0     Boot from flash0
flash1     Boot from flash1
ftp        Boot from a server via ftp
mop        Boot from a Decnet MOP server
rcp        Boot from a server via rcp
rom        Boot from rom
tftp       Boot from a tftp server
usbflash0 Boot from usbflash0
usbflash1 Boot from usbflash1

R1#dir
Directory of flash0:/

    1 -rw-    93157620   Nov 4 2013 21:03:04 -05:00 c3900e-universalk9-mz.SPA.153-1.T1.bin
    2 -rw-        3064   Nov 4 2013 21:13:52 -05:00 cpconfig-39xx.cfg
    3 drw-           0   Nov 4 2013 21:14:22 -05:00 ccpexp
239 -rw-        2464   Nov 4 2013 21:16:08 -05:00 home.shtml
240 -rw-   100829316 Aug 15 2014 20:32:18 -04:00 c3900e-universalk9-mz.SPA.154-2.T1.bin

Which of the below command is right to set up boot variable?

R1(config)#boot system ?
WORD       TFTP filename or URL
flash      Boot from flash memory
flash0     Boot from flash0

R1(config)#boot system flash0:c3900e-universalk9-mz.SPA.154-2.T1.bin

Or

R1(config)#boot system flash0 ?
WORD flash0 system image filename

R1(config)#boot system flash 0 flash0:c3900e-universalk9-mz.SPA.154-2.T1.bin

Leo Laohoo · ‎08-15-2014

2900/3900 ISR G2 has two CF slots. So for the sake of accuracy, I'd go for this:

config t

boot system flash flash0:c3900e-universalk9-mz.SPA.154-2.T1.bin

end

wr

View solution in original post

Leo Laohoo · ‎08-15-2014

2900/3900 ISR G2 has two CF slots. So for the sake of accuracy, I'd go for this:

config t

boot system flash flash0:c3900e-universalk9-mz.SPA.154-2.T1.bin

end

wr

Leo Laohoo · ‎01-28-2015

Thanks for taking the time to rate our posts. :)

rosaho · ‎07-07-2015

This discussion has been reposted from Additional Communities to the WAN, Routing and Switching community.

Muhammad Kashif Siddiqui · ‎05-25-2015

Hi Leo,

What will be the difference If I don't use "flash" keyword before "flash0:c3900e-universalk9-mz.SPA.154-2.T1.bin "

Thanks/Regards

Leo Laohoo · ‎05-25-2015

If you don't use the location, i. e. "flash0:" or "flash1:", the router will not know where to boot and might go into ROMmon.

If you don't want to use the "location" then don't put the second CF card.

Chris Gardner · ‎01-31-2018

Five easy steps on any router, 3945E or 3945.

1. Verify: show run | include boot
2. Conf t
no boot system flash:c3900nm-advsecurityk9-mz.12.4-15.T3.bin (old ios) or you can just give no boot system
boot system <flash0:c3900.........>
3. end
4. Wr mem
5. Verify to make sure if startup config has the right ios: sh start | in boot

jomelpvargas · ‎06-01-2015

Router#conf t

Router(config)#boot system flash c3900e-universalk9-mz.SPA.154-2.T1.bin

Router (config)# do wr

Router (config)#do reload