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need to upgrade Router 3845 to 12.4(15)T need document how to Pls.?

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need to upgrade Router 3845 to 12.4(15)T need document how to Pls.?

Postby Guest » Thu Feb 05, 2009 5:16 pm


Guys,

I need to upgrade a Cisco 3845 router to 12.4(15)t to support HWIC-2FE cards but need help on how to do the upgarde please. I have put the image on t heTFTp server and I an consoled in.

if there is a link for upgrading that router model please?

Please advise.

Regards,

Mike

Guest
 

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Re:need to upgrade Router 3845 to 12.4(15)T need document how to Pls.?

Postby Guest » Thu Feb 05, 2009 5:38 pm


Mike

The basic operation is pretty simple: you copy the new image from TFTP to flash, and then you boot the router using the new image in flash.

The potential complications are related to the size of flash, the contents of flash, and whether there is room in flash for 2 copies of image files (the old image and the new image).

If you have the new image on the TFTP server then you should know its (approximate) size. If you do show flash on the router it will tell you how much is used and how much is free. If the amount free is larger than the new image size then it is easy to have 2 images in flash. If the amount free is smaller than the new image then you need to free up some space in flash before you can load the new image. There may be some other files in flash that you can delete to free up space. Or you may need to delete the old image file (in which case you wind up with only a single image in flash). You would need to figure whether you need to delete anything and if so what you will delete.

Once you have enough space in flash then you use the copy tftp: flash: command to load the image into flash.

If you wind up with only a single image in flash (the new one we assume) then it is simple to boot the new image. You reload the router and it will automatically boot the image (the only one in flash) and you should be good to go.

If there are more than one image file in flash then the router will attempt to boot the first image file that it finds - typically that would be the original image. In this case you should configure boot system commands to tell the router which image to boot. The syntax of the command is: boot system flash:<image_name>

I frequently configure 2 boot system commands: first a boot system command pointing to the new image and then a boot system command pointing to the old image (just in case there is some issue in booting the new image).

HTH

Rick

Guest
 

Re:need to upgrade Router 3845 to 12.4(15)T need document how to Pls.?

Postby Guest » Thu Feb 05, 2009 6:25 pm


Rick,

Thanks for your detailed response.

how do you set two system boot commands?

I don't know of any command that can specify primary and secondary images to boot from?

Pls advise.

Mike

Guest
 

Re:need to upgrade Router 3845 to 12.4(15)T need document how to Pls.?

Postby Guest » Thu Feb 05, 2009 6:28 pm


Mike

You type the first command (with the name of the new image) and press enter, then you type the command a second time (with the name of the old image) and press enter. The router will process them in the order they were entered (so there is no need to specify primary or secondary).

HTH

Rick

Guest
 

Re:need to upgrade Router 3845 to 12.4(15)T need document how to Pls.?

Postby Guest » Thu Feb 05, 2009 7:19 pm


Thanks Rick

Mike

Guest
 

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