Information
Selects the Secure Shell (SSH) protocol.
Rationale:
Configuring VTY access control restricts remote access to only those authorized to manage the device and prevents unauthorized users from accessing the system.
Solution
Apply SSH to transport input on all VTY management lines
hostname(config)#line vty <line-number> <ending-line-number>
hostname(config-line)#transport input ssh
Impact:
To reduce risk of unauthorized access, organizations should require all VTY management line protocols to be limited to ssh.
References:
http://www.cisco.com/en/US/docs/ios/termserv/command/reference/tsv_s1.html#wp1069219