Combine flour, sugar, soda, salt and cinnamon. Add eggs and oil; stir until dry ingredients are moistened. Do not beat. Stir in vanilla, pineapple, 1 cup of pecans and bananas. Spoon into 3 (9") layer cake pans. Bake in a 350 degree oven 25 to 30 minutes. Cool in pans 10 minutes, then remove. When cool, spread frosting between layers and on top and sides. Sprinkle pecans on top.