Monday, July 11, 2016


Cisco iOS

Ø  Cisco iOS Use IFS (Integrated file System) To keep track of files and Folders
Ø  IFS give us Differnet Places where we Store and Retrive the Files 

Load the iOS from TFTP Server to Router
First Check the Connectivity with TFTP Server
TFTP Server is nothing But a PC which we install the TFTP software to Copy the Files from the Router}
Ø  Router# ping (tftp Server ip address)
Ø  Router# copy tftp: flash:
Ø  Address or name of remote host []?                               {tftp server ip address}
Ø  Source filename []? c2900-universalk9-mz.SPA.151-4.M4.bin           {iOS file name}
Ø  Destination filename [c2900-universalk9-mz.SPA.151-4.M4.bin]             {enter}
  {iOS file name same as above}

{This will take some time}

Ø  Router# show flash:                                      (to check the iOS}

To Boot from this iOS image
Ø  Router(config)#boot system flash c2900-universalk9-mz.SPA.151-4.M4.bin            {new iOS}
Ø  Router(config)#no boot system flash c2600-universalk9-mz.SPA.151-4.M4.bin  
{To Train the router to Boot the system with newly iOS instead of Previous}


  1. How Many IOS images can a Router/Switch Stores

  2. Its Depends on Router/Switch Flash Size

  3. Yes, you are absolutely right. It depends on the size of flash memory.

  4. Bud! Whatever it is... you share the great information with all of us.
    you are really a great IT professional. Almost there are many who just update/collect the knowledge only for themselves.

    Many Thanks to you buddy!!!

    Knowledge is Power. Learn it, share it & collaborate.

  5. How to install ios in 3640 Series router.
    Because it would not take cmd tftpdnld
    Give me any suggeation.
    Right now it is in rommon mode.
    Which cmd i