Cisco released IOS 12.4 this month. This is a Major Release that incorporates features developed in the IOS12.3T line. IOS Feature Navigator shows there is no support for the Secure Shell SSH Version 2 Server or Client for my Cisco 2651XM router. Hopefully this will be added soon, but I was surprised that there is not support for Secure Shell Shell Shell 2 Server for my 2651X router in 12.3(1). Hopefully this is added soon.”]
Source: https://taosecurity.blogspot.com/2005/05/cisco-releases-ios-12.html