Hello Sprout,
Both console and VTY are configurable user interfaces. In fact, there are two types of user interfaces that are not configurable: LTT and web.
The LTT user interface is used in the following scenarios:
1. Run the local-telnet command in the diagnostic view to log in to the slave MPU.

2. Login to the device through the console interface on the slave MPU.

The local-telnet function provides a method for logging in to the slave MPU to locate faults. You can use this method to check whether the configurations on the slave MPU are the same as those on the master MPU. The LTT is also used when you log in to the device through the console interface of the MPU. This is because the Telnet login is simulated, that is, by redirecting the login through the console interface to Telnet.
Any further questions, let us know!