`transport`

transport

Manage line transport protocols. Accessed in configuration mode under line. More information: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/command/iosxe/qualified-cli-command-reference-guide/m-line-commands.pdf.

Restrict line protocols to ssh:

transport input ssh

Restrict line protocols to telnet:

transport input telnet

cisco-ios

line	Manage lines.
enable	Enter privileged execution mode.
clock	Set the system clock.
reload	Control reboot behavior.
write	Write data to memory.
transport	Manage line transport protocols.
configure	Enter configuration mode.
show	Show various system information.
question-mark	Get context sensitive.
ip	Manage IP configurations.
erase	Delete preset things.
username	Manage users.
login	Manage console and virtual line authentication.
crypto	Manage cryptography.
dir	List files.
delete	Delete individual files.
interface	Manage interfaces.