What is feasible distance and advertised distance in EIGRP?

The Advertised Distance (AD) is the distance from a given neighbor to the destination router. Feasible Distance. The Feasible Distance (FD) is the distance from the current router to the destination router.

What is feasible condition in EIGRP?

The Feasibility Condition states that a route will not be accepted if the Reported Distance is more than the best path’s Feasible Distance. Or said another way and from the perspective of the router: a path to a network will not be accepted if my neighbor’s cost is more than my cost.

How does EIGRP calculate feasible distance?

feasible distance: Best metric among all path to a network. It is calculated by adding the advertised/reported distance advertised by the neighbor and the cost calculated by that current router to reach the neighbor. successor: It is the (lowest) best path to reach to any specific destination network.

What is the benefit of having a feasible successor route with EIGRP?

EIGRP maintains redundant routes in memory so that if one fails, reverting to an backup route can occur instantaneously. A feasible successor is a backup route that can be used in the event of a topology change without having to recalculate routes.

What is the difference between EIGRP and Rip?

RIP is a distance vector protocol. EIGRP is derived from Integrated Gateway Routing Protocol. 6. It allow maximum hop count upto 15.

How does EIGRP calculate feasible successor?

A successor route for any given destination is chosen as having the lowest computed feasible distance; that is, the lowest sum of reported distance plus the cost to get to the advertising router.

What is administrative distance of EIGRP?

The lower the better…as you can see EIGRP has a lower administrative distance (90) than OSPF (110) so we will use EIGRP in my example. Keep in mind: The administrative distance is only local and can be different for each router. The administrative distance can be modified.

What is the difference between reported distance and feasible distance?

Reported (advertised) distance (RD or AD) – the metric advertised by the neighboring router for a specific route. This is the metric of the route used by the neighboring router to reach that specific destionation network. Feasible distance (FD) – the local router’s metric of the best route to reach a specific network.

What are the disadvantages of EIGRP?

Cons of EIGRP

EIGRP routing protocol can be accessible with the CISCO network devices.
EIGRP is a distance vector routing protocol, and it relies on routes provided by neighbors.
It does not support future applications as it is not extensible.

What is the main difference between OSPF and Eigrp?

The main difference between these protocols is that EIGRP exchanges the complete routing information just one time when the neighbouring routes are established after that it only tracks the changes. On the contrary, OSPF keeps track of the whole topology database of all the connection in the database consistently.

What is feasible distance in EIGRP?

1 Feasible Distance only changes when EIGRP goes to Active to Passive. 2 Feasible Distance cannot increase. It can only stay or decrease. 3 It is just a historical record how closest the router was to the destination.

How does EIGRP calculate metrics?

In EIGRP, a local router calculates the metric for each route, but also considers the next-hop router’s metric for that same destination subnet. These metric have their own names: Reported (advertised) distance (RD or AD) – the metric advertised by the neighboring router for a specific route.