Tech Notes: Feasible distance and Advertise distance

Feasible distance and Advertise distance
More Good stuff if you are studying for CCNA


FD=fiasable distance

AD=advertise distance

AD = distance from the neighbor router to the destiny

FD = AD+the cost between your router and his neighbor

is simple as that
Simple example

R1---------R2--------R3---------R4

Cost from R1 to R2 is 4

Cost from R2 to R4 is umm 8 so AD is 8 cause is the cost from the neighbor of R1 to destiny

FD = 4+8=12

in this example i just gave you a uniroute from R1 to R4 but normally there will be many routes with many differets FD, the router pick the one with lower FD and put it in the routing table.