Router IOS Upgrade

 IOS Upgradation on Cisco Routers

As we know cisco introduced the new IOS version with their different features to upgrade the services and performance in the real time network. Below process is common for all the cisco legacy routers that includes the latest version of routers and old models as well.
  • First we need to download the Latest Image IOS as per the model (Ex: 8300, 4300, 2800 etc)  from cisco site and whatever IOS is recommended in your organization Infrastructure.
  • Once you downloaded the Image then copy it into the router ( You can copy the image via from TFTP, FTP and USB drive ) as the Cisco Routers having a USB port as well to move the data from external USB stick to Router Flash drive.
   Commands:
       
    USB: copy usb0:<IOS name> bootflash:
    for example: copy usb0:isr4300-universalk9.16.06.08.SPA.bin
    bootflash:         
  
     TFTP Server: copy tftp: bootflash:
     copy tftp: bootflash:
     TFTP Server IP : [x.x.x.x]  // Defines the TFTP server IP
     Source File name:<IOS name>  // Defines the source folder
     Destination File name:<IOS name> // Defines the flash destination

Verifying MD5 Value:
Once the required IOS image is copied into the router. Please verify the MD5 value of IOS image to check the image is not corrupted while copying the from TFTP/USB/ from device to device.

Command:  Verify /md5 bootflash:<IOS name>



Setting up a boot sequence of Image:

First delete the old boot sequence from router otherwise the new boot sequence will take the second priority instead of Primary.

  Commands:
    Router# no boot system
    Router# boot system bootflash:<Primary IOS name>
    Router# boot system bootflash:<Secondary IOS name>

  Verify: (Boot Sequence)

   show run | i boot
   show boot

At last, Save the configuration of device and reload the router to effect the new image of device.

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