Link-Layer Topology Discovery Mapper (lltdsvc) Service Defaults in Windows 10

Creates a Network Map, consisting of PC and device topology (connectivity) information, and metadata describing each PC and device. If this service is disabled, the Network Map will not function properly.

Default Settings

Startup type:Manual
Display name:Link-Layer Topology Discovery Mapper
Service name:lltdsvc
Service type:share
Error control:normal
Object:NT AUTHORITY\LocalService
Path:%SystemRoot%\System32\svchost.exe -k LocalService -p
File:%SystemRoot%\System32\lltdsvc.dll
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lltdsvc
Privileges:
  • SeImpersonatePrivilege
  • SeChangeNotifyPrivilege

Default Behavior

Link-Layer Topology Discovery Mapper is a Win32 service. In Windows 10 it is starting only if the user, an application or another service starts it. When the Link-Layer Topology Discovery Mapper service is started, it is running as NT AUTHORITY\LocalService in a shared process of svchost.exe along with other services. If Link-Layer Topology Discovery Mapper fails to start, the failure details are being recorded into Event Log. Then Windows 10 will start up and notify the user that the lltdsvc service has failed to start due to the error.

Dependencies

Link-Layer Topology Discovery Mapper cannot be started under any conditions, if the following services are disabled, deleted or working improperly:

Restore Default Startup Configuration for Link-Layer Topology Discovery Mapper

Before you begin doing this, make sure that all the services on which Link-Layer Topology Discovery Mapper depends are configured by default and function properly. See the list of dependencies above.

1. Run the Command Prompt as an administrator.

2. Copy the command below, paste it into the command window and press ENTER:

sc config lltdsvc start= demand

3. Close the command window and restart the computer.

The lltdsvc service is using the lltdsvc.dll file that is located in the %WinDir%\System32 folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 10 installation media.