In a rigid route, auto route regions always dynamically update to assembly changes. They do not involve dimensions until the Convert to Sketch command is applied.
For sketched route segments, there are three typical types of dimensions pertaining to route sketch:
Similar to Autodesk Inventor, dimensions on the route sketch can be categorized into two types: normal sketched dimension (driving dimension) and driven dimension. Normal sketched dimensions are used to drive the route geometry. For instance, sketched route segments are manually created using a specified dimension. Driven dimensions are enclosed in parentheses as displayed in the graphics window and allow route geometry to dynamically respond to associated changes.
In the route environment, normal sketched dimensions can be manually set using the General Dimension or Parameters command. Optionally, use the Include Geometry command to introduce reference geometry to place angular dimensions when editing a sketched route segment.
The Auto-Dimension option only applies to forward creation when you manually define the next route point. By default, it is checked so Autodesk Inventor creates driving dimensions on the route sketch accordingly. View the Format panel of the Sketch tab to ensure the Driven Dimension command is depressed.
If the active rigid piping style includes 45-degree elbows and the included angle between two sketched route segments is 135 degrees, an angular dimension is always created regardless of whether Auto-Dimension option is checked.