ip domain-name yourdomain.but.it.doesnt.really.matter.com
ip ssh version 2
crypto key gen rsa      ! you may get prompted for bits, I use 1024
line vty 0 15
  transport input telnet ssh      ! compare to existing config first
end

copy run start

line vty 0 15
  transport input ssh
end
copy run start

access-list 23 permit 10.10.10.0 0.0.0.255     ! NMS subnet
line vty 0 15
  access-class 23 in
end
copy run start