The EIGRP feasibility conditions

A Cisco IOS EIGRP feasible successor router can become successor provided the following criteria are met:

1. ADfeasible successor < FDsuccessor


2.FD feasible successor < (variance * FDsuccessor)

Here the AD is the Advertised Distance (“reported distance”) and the FD is the Feasible Distance.

*Since the default Variance = 1, EIGRP will only loadbalance between equal – cost routes once the variance is greater than one.

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