boot system tftp query

hi i have done the following:

copy flash to tftp - successfully & have located flash ios

i assumed that when using (boot system tftp) that if someone changed my config on my router by accident and then did: copy run start - i thought that a reboot of the router would connect to my tftp and put back my missing config ?

i also did:

boot system tftp etc 192.168.1.34 - pointing to the tftp server    

i assumed the flash file copied back to my tftp would also hold my configurations so im obviously off track somewhere.

can anyone help ?
mikey250Asked:
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Don JohnstonInstructorCommented:
i assumed that when using (boot system tftp) that if someone changed my config on my router by accident and then did: copy run start - i thought that a reboot of the router would connect to my tftp and put back my missing config ?
No. That tells the router to load the IOS image from a TFTP server (as opposed to loading from flash). If the config (or that part of it) is erased, then the router will load the IOS using the default sequence of locations.
i assumed the flash file copied back to my tftp would also hold my configurations so im obviously off track somewhere.
"copy flash tftp" is used to copy the operating system to the tftp server.

If you want to copy the config, you would use the "copy running-config tftp" or copy "startup-config tftp" command
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mikey250Author Commented:
hi don, thanks for those comments!!

I have been doing some reading and it seems that the 'boot system' is not really useful unless under specific required circumstances.

q1.  can you give me some useful advice ?
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Don JohnstonInstructorCommented:
Advice on what?
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mikey250Author Commented:
whats the point of adding 'boot system flash or boot system tftp' ?
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Don JohnstonInstructorCommented:
Gotcha.

When the router boots and loads the OS, the boot loader will find the first file in flash and copy that into RAM. If you want to upgrade the IOS, you copy the new version into flash. But the boot loader will continue to load the older IOS. So you use the boot system flash command to tell the boot loader to load a specific IOS into memory.

boot system tftp is used when you want the router to load the IOS from a TFTP server. Given the size of IOS's these days and the cost of flash, it's not a popular option.
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mikey250Author Commented:
currently I only have 1 x flash file.

given the size of the ios's these days and the cost of flash, it's not a popular option - ok this is what I was reading.

appreciated
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Don JohnstonInstructorCommented:
If you've only got one OS in flash, the boot system command is unnecessary. :-)
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mikey250Author Commented:
understood.
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mikey250Author Commented:
appreciated for advice!
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