Path Sub-optimality 2 2.2 1.1 1.2 ×22 start end 3.2.1 3 hop red path VS 3.1 3.2 2 hop green path 2021/1/31Path Sub-optimality 2021/1/31 8 8 1 2 3 1.1 1.2 2.1 2.2 3.1 3.2 2.2.1 3 hop red path vs. 2 hop green path start end 3.2.1 1.2.1