In a large bowl, cream butter and 2 cups sugar until light fluffy. Add 1 egg at a time, beating well after each addition. Beat in vanilla. Combine flour, baking soda and salt; add alternately with sour cream, beating just enough after each addition to keep batter smooth. , Spoon a third of batter into a greased 10-in. tube pan. Combine cinnamon, nuts and remaining sugar; sprinkle a third over batter in pan. Repeat layers 2 more times. Bake at 350° for 60-65 minutes or until a toothpick inserted in the center comes out clean. Cool for 15 minutes before removing from pan to a wire rack to cool completely.