How to restrict OpenSSH to use SSH-1 or SSH-2 or fallback from SSH-2 to SSH-1 when need?

[Amarpal Singh]

Hi All,

I am a newcomer to the SSH world. How do we restrict OpenSSH (3.1) to use
SSH-1 or SSH-2 or fallback from SSH-2 to SSH-1 when need?

Thanks
Amarpal.