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en.wikipedia.org/wiki/EIGRP

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Posted by crouse

DUAL Algorithm

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Posted by Hash007

1. Successor: A route (or routes) selected as the primary route(s) used to transport packets to reach destination. Note that successor entries are kept in the routing table of the router.
2. Feasible successor: A route (or routes) selected as backup route(s) used to transport packets to reach destination. Note
That feasible successor entry is kept in the topology table of a router. There can be up to 6 (six) feasible successors for IOS version 11.0 or later. The default is 4 feasible successors.
3. DUAL (Diffusing Update Algorithm):
Enhanced IGRP uses DUAL algorithm to calculate the best route to a destination.

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Posted by jhon186