In the source routing example below (also discussed in the class), the address received by B is not reversible and doesnt help B know how to reach A. Propose a modification to the delivery mechanism that does allow for reversibility. Your mechanism should use address rotation scheme as shown in the figure and should not require giving all switches globally unique names.

Switch 1 2 Switch 2 30 1 Host A Switch 3 Host B Switch 1 2 Switch 2 30 1 Host A Switch 3 Host B