-@cindex GraphDumpFile
-@item GraphDumpFile = <@var{filename}> [experimental]
-If this option is present,
-tinc will dump the current network graph to the file @var{filename}
-every minute, unless there were no changes to the graph.
-The file is in a format that can be read by graphviz tools.
-If @var{filename} starts with a pipe symbol |,
-then the rest of the filename is interpreted as a shell command
-that is executed, the graph is then sent to stdin.
-