Check out the command "ssh pubkey-chain"
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I tried that method I have exchanged the pub keys between the two clients, I issue the command
ssh -l user x.x.x.x and the debug shows the following:
%SSH-3-AUTH_METH_ERR: Server does not support password or keyboard-interactive authentication
SSH CLIENT0: user authentication failure(code = 0)
SSH CLIENT0: Session disconnected - error 0x00#
This looks like that the cisco ssh client cannot authenticate using RSA it always expects that a username and password will be sent.
looking at your ssh-server
* using "DEBUG"-LogLevel
admin@ubuntu:~/.ssh$ cat /etc/ssh/sshd_config | egrep "Level" #LogLevel VERBOSE LogLevel DEBUG
admin@ubuntu:~/.ssh$ tail -f /var/log/auth.log
Aug 28 17:63:92 ubuntu sshd: Connection closed by authenticating user admin <router-ip> port #nnn [preauth]
so the router (ssh-client) drops the session as the server wants to see some authentication-credentials.