TechStop

Apr 30 2012   8:03PM GMT

Cisco IOS Verification

Joshua Wood Joshua Wood Profile: Joshua Wood

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.

verify flash:c2900-universalk9-mz.SPA.152-1.T.bin
Starting image verification
Hash Computation: 100% Done!
Computed Hash SHA2: 97CDD1896F637C9C95718A6FF417C095
77259714B640E6DD6D044B689EB89768
B55320FA3B18FFEFF5A80A230D090AF8
35FE520E264A08EEFFF64D859FC211D2

Embedded Hash SHA2: 97CDD1896F637C9C95718A6FF417C095
77259714B640E6DD6D044B689EB89768
B55320FA3B18FFEFF5A80A230D090AF8
35FE520E264A08EEFFF64D859FC211D2

CCO Hash MD5 : FC092A4EC7236022508ECCF8E789084B
Digital signature successfully verified in file flash0:c2900-universalk9-mz.SPA.152-1.T.bin

Cisco IOS Image Verification

http://www.cisco.com/web/about/security/intelligence/iosimage.html

Until next time,
TechStop (JW)

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