more variance...

given: the successor route is the route through ra because it has the lowest metric

this also means that the fd (feasible distance) is 10

given: the rd's for the routes through rb and rc are 5 and 15 respectively

rb is an fs route because it's rd is less than 10... the route through rc is not a feasible successor because it's rd is greater than 10

with a default variance of 1 there is no change

with a variance of 2 2x10 = 20, they are now equal and the route can be added for load balancing

the computation does not have to come out equal... a variance of 3 would make rb less by 10, and the route would be added as well

rules


The variance is multiplied by the FD (the metric of the best route to reach the
subnet).

Any FS routes whose calculated metric is less than or equal to the product of
variance times FD are added to the IP routing table, assuming the maximum-paths setting allows more routes.

Routes that are neither successor nor feasible successor can never be added to the IP routing table, regardless of the variance setting.