Unit 1: Network Infrastructure
This will allow you to demonstrate your networking skills, knowledge, and abilities, with a focus on enterprise-level switching, routing, and multicast components that support cross-platform (inter)operability and integration with the most recent software-defined technologies.
Uneven path load balancing is the main focus of EIGRP Variance.
If a path does not satisfy the feasibility criteria and has the same metrics, EIGRP will not load balance it.
The feasibility condition is a method that has the purpose of ensuring that the path to the destination network does not contain any loops. Essentially it stipulates that the distance to a network, as stated by a neighbor (the reported distance), must be strictly less that the distance the router currently knows about (the feasible distance).
So what is the feasible distance? The feasible distance is the shortest distance that has been recorded to a destination network since the network’s most recent transition from active to passive (the state that occurs when the network is fully converged).
In the event that EIGRP has more than one path with an identical metric to the destination, it will load up to four pathways (by default) or more if the maximum-paths command is set higher. However, by default, EIGRP will only load the best path, also known as the successor, into the routing table.
The picture above shows an EIGRP network that links 10.2.2.0/24 (PC-1) to 10.5.5.0/24 (PC-2).
As expected, the routing table on R1 shows a single route to 10.5.0/24 via R2.
R1#show ip route | i 10.5.5.0
D 10.5.5.0/24 [90/204800] via 1.2.1.2, 00:09:40, FastEthernet1/0
On the other hand, the EIGRP topology table displays 1 successor and 1 feasible successor.
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