Migration Decision Function
The MDF is used to determine the next node to visit in the network
pijk (t) = Pp[Tijkp(t) ]-akp[C(i,j)]-b / Nk(i,j,t)
Nk(i,j,t) = Sj in A(i) Pp [Tijkp(t) ]- akp[C(i,j)]-b
akp, b are control parameters
Nk(i,j,t) is a normalization term
A(i) is the set of available egress links