Link-Layer Topology Discovery Mapper (lltdsvc) Service Defaults in Windows 7
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 |
| File: | %SystemRoot%\System32\lltdsvc.dll |
| Registry key: | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lltdsvc |
| Privileges: |
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Default Behavior
Link-Layer Topology Discovery Mapper is a Win32 service. In Windows 7 it won't be started if the user doesn't start 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. Other system components, such as drivers and services, may run in the same process. If Link-Layer Topology Discovery Mapper fails to start, Windows 7 attempts to write the failure details into Event Log. Then Windows 7 startup should proceed and the user should be notified that the lltdsvc service is not running because of the error.
Dependencies
Link-Layer Topology Discovery Mapper is unable to start, if at least one of the following services is stopped or disabled:
Restore Default Startup Configuration of 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 C:\Windows\System32 directory. If the file is removed or corrupted, read this article to restore its original version from Windows 7 installation media.