[GRASS-windows] Converting polygons to lines

[supunmali]

I need to convert a road network in polygons to lines to do a network analysis. 
I converted polygons to line by using v.type.bl- converting boundaries to lines. Then instead of getting single lines, i'm getting border lines over the polygon that was there earlier (No polygon its now line data). I tried cleaning options in GRASS but it didnt work. 
Please provide me with guidelines on how to convert it to line data enabling to do network analysis.

Thanks
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