Here are a few additional Cisco Router images. For example, if you use a c1700 series Router, it will be insufficient because it does not support some features when you create a more advanced network topology.
After downloading one of the iOS images to your computer, you can watch the video below to add the image file to the Graphical Network Simulator-3 and also subscribe to our YouTube channel to support us!
C3660 Is Mz 124 15 T8 Image Bin
Above you can see that I already entered the IP address and filename. Once I hit enter, it will only ask me for the destination filename (which I also could have entered). If you have to upgrade the IOS image on multiple devices, this is more convenient as you can just copy/paste the above line on all devices.
So far we copied a couple of files but how do we know that these files are valid? When we downloaded the Cisco IOS image, I showed you the MD5 checksum that Cisco publishes on their website. We can verify this checksum on our router:
This MD5 checksum is the same as the one we found on the Cisco website. This tells us that we have the same file as Cisco published and that the file has not been tampered with. If the checksum fails, maybe someone has added something nasty to the image.
Most routers will select the first filename that they find on the flash memory so in our case, it means it would boot the older IOS image. We can change this with the boot sytem command:
You have now learned how to upgrade your Cisco IOS image through TFTP, FTP and SCP. You have seen how this can be done from your computer to your router/switch or between two routers. We also checked how to verify the integrity of the file with the MD5 checksum and how to configure your router to boot the new IOS image.
c3640-jk9s-mz.124-16.binc3660-jk9o3s-mz124-6XT2.binc3725-advipservicesk9-mz124-25b.binc3745-adventerprisek9_ivs-mz.124-15.T8.binc7200-advipservicesk9-mz150-1M.bin 2ff7e9595c
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