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Thanks that is making more sense to me now
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Advertised Distance (AD) is the total metric along a path to a destination network as advertised by an upstream neighbor.This distance is sometimes also called a Reported Distance and is equal to the current lowest total distance through a successor for a neighboring router.<br />
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A Feasible Distance (FD) is the lowest known distance from a router to a particular destination. This is the Advertised Distance (AD) + the cost to reach the neigboring router from which the AD was sent<br />
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As FD = AD + cost to reach the neigboring router <br />
So, the shortest the AD, the more preffered the route will be as it minimises the toal cost to the destination.<br />
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Hope this clarifies.<br />
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Thanks<br />
Nishant
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Hi,.<br />
<br />
Can anyone explain to me in eigrp. When a route to a network goes down. Dual searches the topology table for feasible successor.<br />
Why does it not just go to next lowest feasible distance in its topology table. Why does it go through the process of &nbsp;looking for a route in table with reported distance lower than its current feasible distance ( route &nbsp;that is gone down)?? <br />
<br />
thks
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Hi,.

Can anyone explain to me in eigrp. When a route to a network goes down. Dual searches the topology table for feasible successor.
Why does it not just go to next lowest feasible distance in its topology table. Why does it go through the process of  looking for a route in table with reported distance lower than its current feasible distance ( route  that is gone down)?? 

thks

EIGRP DUAL Process selecting feasible successor

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