Help with pgRouting & PostGIS

Hi,

I have been using PostGIS for a while and it works great for my requirement. I have roads & streets as shapefile and now, I wanted to a find the shortest route between locations.

I found pgRouting during the search process. There they talk about topology. They have suggested to use 3 tools for creating data for pgRouting and I don't have access to 2 of them. The one that is familiar to me is PostGIS. I intalled the topology functions and I am struck without any direction. Now what ?

I request any one of you help me and I would greatly appreciate.

I have shapefiles of roads and how do I create data for pgRouting ?

Thanks
Green

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