This command was introduced.
ip ssh version [1 | 2]
Cisco IOS Security Command Reference: Commands D to L - ip source-track through ivrf [Support] - Cisco
this command introduced in 12.3(4)sorry.
Secure Shell Version 2 Support (cisco.com)
Before configuring SSH, ensure that the required image is loaded on your device. The SSH server requires you to have a k9 (Triple Data Encryption Standard [3DES]) software image depending on your release.