Preheat oven to 350 degrees F. Grease a 10-inch tube pan; set aside.

In a large bowl, cream butter and 2 cups sugar until light fluffy. Add eggs, one 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 the prepared pan. Combine cinnamon, nuts and remaining sugar; sprinkle a third over batter in pan. Repeat layers two more times. Bake 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.