Link-Layer Topology Discovery Mapper I/O Driver (lltdio) Service Defaults in Windows 11
Link-Layer Topology Discovery Mapper I/O Driver.
Default Settings
| Startup type: | Automatic |
| Display name: | Link-Layer Topology Discovery Mapper I/O Driver |
| Service name: | lltdio |
| Service type: | kernel |
| Error control: | normal |
| Group: | NDIS |
| Path: | %SystemRoot%\system32\drivers\lltdio.sys |
| Registry key: | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lltdio |
Default Behavior
Link-Layer Topology Discovery Mapper I/O Driver is a kernel driver. In Windows 11 it starts automatically during the operating system startup. If Link-Layer Topology Discovery Mapper I/O Driver fails to start, the failure details will be recorded into Event Log. Then Windows 11 should boot up and notify the user about the lltdio service startup failure.
Dependencies
If Link-Layer Topology Discovery Mapper I/O Driver doesn't work properly, the following services will not start:
Restore Default Startup Configuration of Link-Layer Topology Discovery Mapper I/O Driver
1. Run the Command Prompt as an administrator.
2. Copy the commands below, paste them into the command window and press ENTER:
sc config lltdio start= auto
sc start lltdio
3. Close the command window and restart the computer.
The lltdio service is using the lltdio.sys file that is located in the C:\Windows\system32\drivers directory. If the file is removed or corrupted, read this article to restore its original version from Windows 11 installation media.