For SSH to work, your Cisco switch needs an RSA public/private key pair. The VTY relies on SSH for its secure transport.
Follow these steps to set up your Cisco Switch to run SSH:
Switch#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#hostname HO1
HO1(config)#ip domain-name magwinya.co.za
HO1(config)#crypto key generate rsa
% You already have RSA keys defined named HO1.magwinya.co.za.
% Do you really want to replace them? [yes/no]:
HO1(config)#ip ssh version 2
HO1(config)#line vty 0 4
HO1(config-line)#transport input ssh
HO1#copy running-config startup-config
Destination filename [startup-config]?
Building configuration…
[OK]
Warning:
I am not responsible for any damage to your Cisco Catalyst Switch. If you point the finger at me for messing up your Cisco Catalyst Switch, I will definitely laugh at you.