IOS Upgrade Help

Unanswered Question
Feb 19th, 2007

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 names? I want to make sure I am using the correct IOS. The router has IP Routing/Firewall FS/ and VPN abilities. Any help would be greatly appreciated.

I have this problem too.
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perkins_j99 Mon, 02/19/2007 - 21:01


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 12.2.40 because that release is the last available with ENTERPRISE/FW/IDS PLUS IPSEC 56 features. Am I understanding correctly that I can only upgrade to 12.2.40?

Thanks again.. JP

ahmednaas Mon, 02/19/2007 - 23:21

You can also upgrade to:



These are the same feature set but with a more advanced encryption (3DES, 168 bit) in addition to plain DES (56 Bit).


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