Network topology defines the interconnection of links and, optionally, nodes at link junctions. Network segments have a specified direction. Links can be lines, open polylines, or arcs. You can use information from different layers to define a network topology.
To create a network topology
Do one of the following to bring the linework into the current drawing:
Attach the drawings containing the linework. Query the linework into the current drawing.
To include all links in the map, click Select All.
To manually select the links to include, click Select Manually. Click Select Links to select the links in the map. When you finish selecting links, press Enter.
To filter (restrict) link selection by layer (only links on the specified layers will be selected), specify the layers in the Layers box. To select from a list of layers in the map, click Select Layers. If the layer is not listed, it may be Frozen, Locked, or Off. To use all layers, enter an asterisk (*).
To filter link selection by object class, specify the object classes in the Object Classes box.
Select a block to use for the nodes. To use a point object, select ACAD_POINT. Modify the appearance of a point object using the PDMODE and PDSIZE system variables.
Click Finish to create the topology.
If appropriate, save the topology information back to source drawings.