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ccna global certification fees in india.10 Supports Equal-Cost and UnequaLCost LoadBalancing. . It works seamlessly with data-link layer protocols. and EIGRP does not require special configuration for Layer 2 protocols. . Supports Non-Stop Forwarding (NSF), which allows an EIGRP neighboring device of a failed router to retain the routing information it advertises.The EIGRP neighbor device of a failed router is allowed to retain the routing information it advertised and continue to use this information until the failed router resumes normal operation and can hand off the routing information.Chapter 16 EIGRP .271 .Exchange the routing information.16.1.2 DUAL AlgorithmDUAL, the computational engine that drives EIGRP, is the heart of the EIGRP routing protocol and ensures that loop-free paths and loop-free alternate paths are properly used throughout the routing domain. By using DUAL, EIGRP saves all available routes that can reach their destinations and quickly switches to alternate routes in the event of a primary route failure. Learning DUAL requires mastery of the following terms.Successor: A directly connected neighbor router through which the destination network is reached with the smallest metric. The successor is the router that provides the primary route that is placed in the EIGRP topology table and routing table. For the same destination network, multiple successors can exist.Feasible Successor: is a directly connected neighbor router, but the metric to reach the destination network through it is larger than through the successor router, and it is advertised at a distance less than the feasible distance to reach the destination network through the successor router. A feasible successor is a router that provides a backup route that is placed only in the EIGRP topology table. Multiple feasible relays can exist for the same destination network.FeasibleDistance (FD): The smallest metric to reach the destination network. ReportedDistance (RD): The smallest metric that a neighboring router advertises for itself to reach the destination network; some sources refer to RD as AD (AdvertisedDistance). o Feasible Condition (FC): The basis for EIGRP routers to update routing and topology tables. table. Feasible condition can effectively prevent routing loops and achieve fast convergence of routes. The formula for the feasibility condition is RDVFD.EIGRP FiniteStateMachine (FSM): contains all the logic used to compute and compare routes in the EIGRP network, the EIGRPFSM logic is shown in Figure 16-1.