“…Other mechanisms, although less common, are Multiple Routing Configurations (MRC) [ 11 , 30 , 40 , 41 , 42 , 43 , 44 ] and Not-Via Addresses [ 35 , 45 ]. Furthermore, there are tunneling-based mechanisms, such as Maximally Redundant Trees (MRT) [ 46 , 47 ], and, finally, IPFRR mechanisms based on alternative trees [ 22 , 48 , 49 , 50 ].…”