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I want to upgrade a Cisco 2621 router IOS. The current IOS in flash is c2600-jk8o3s-mz.122-17.bin. The closest latest version I could find is c2600-ik9o3s3-mz.123-22.bin. What is the difference between the jk and the ik and the s and s3 in the IOS...
rwyates--thanks for the links. I used the feature comparison tool to find the exact IOS featureset name I need for the upgrade. The device is a Router 2621 with ENTERPRISE/FW/IDS PLUS IPSEC 56 features. Now, it looks like I can only upgrade to 12....
