Link-Layer Topology Discovery Responder (rspndr) Service Defaults in Windows 7

Link-Layer Topology Responder Driver for NDIS 6 by Microsoft Corporation.

Default Settings

Startup type:Automatic
Display name:Link-Layer Topology Discovery Responder
Service name:rspndr
Service type:kernel
Error control:normal
Group:NDIS
Path:%SystemRoot%\system32\DRIVERS\rspndr.sys
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\rspndr

Default Behavior

Link-Layer Topology Discovery Responder is a kernel device driver. In Windows 7 it is starting automatically on the operating system startup. If Link-Layer Topology Discovery Responder 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 rspndr service is not running because of the error.

Restore Default Startup Configuration for Link-Layer Topology Discovery Responder

1. Run the Command Prompt as an administrator.

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

sc config rspndr start= auto
sc start rspndr

3. Close the command window and restart the computer.

The rspndr service is using the rspndr.sys file that is located in the %WinDir%\system32\DRIVERS folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 7 installation media.