Hi all, your routers need an IOS upgrade and you have downloaded the bright shiny new IOS version for your router from Cisco. But the download had “issues”. I will let you fill in the “issues” bland there with anything that I am sure you have run across more than 100 times with other downloads. So you want to confirm that the IOS version you have downloaded is intact. What to do …
You would run the verify command on the IOS version. If you issue the command verify then flash:IOS_file_name then the router will perform an IOS check of the MD5 checksum included in the IOS version and give you something like what is below. And that is how you would quickly and easily verfiy IOS file integrity for routers.
Starting image verification
Hash Computation: 100% Done!
Computed Hash SHA2: 97CDD1896F637C9C95718A6FF417C095
Embedded Hash SHA2: 97CDD1896F637C9C95718A6FF417C095
CCO Hash MD5 : FC092A4EC7236022508ECCF8E789084B
Digital signature successfully verified in file flash0:c2900-universalk9-mz.SPA.152-1.T.bin
Cisco IOS Image Verification
Until next time,