In a small bowl mix together the pecans, brown sugar and cinnamon. Pour 1/3 of the cake batter into prepared bundt pan. Sprinkle 1⁄2 of the cinnamon mixture on top. Add another 1/3 of the cake batter and top with remaining cinnamon mixture. Add the remaining batter. Bake for one hour at 325 degrees. Remove from pan. While still warm dust with powdered sugar. Or, when cool, frost with thin layer of white frosting.