R1#show ip route eigrp
2.0.0.0/32 is subnetted, 1 subnets
D 2.2.2.2 [90/2297856] via 172.12.123.2, 00:00:18, Serial0/0
3.0.0.0/32 is subnetted, 1 subnets
D 3.3.3.3 [90/2297856] via 172.12.123.3, 00:00:18, Serial0/0
D 192.168.10.0/24 [90/2172416] via 172.12.123.2, 00:00:18, Serial0/0
[90/2172416] via 172.12.123.3, 00:00:18, Serial0/0
Looking at the EIGRP topology table I can see all the routes
R1#show ip eigrp topology
IP-EIGRP Topology Table for AS(100)/ID(1.1.1.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 3.3.3.3/32, 1 successors, FD is 2297856
via 172.12.123.3 (2297856/128256), Serial0/0
via 172.12.123.2 (2300416/156160), Serial0/0
P 2.2.2.2/32, 1 successors, FD is 2297856
via 172.12.123.2 (2297856/128256), Serial0/0
via 172.12.123.3 (2300416/156160), Serial0/0
P 1.1.1.1/32, 1 successors, FD is 128256
via Connected, Loopback0
P 192.168.10.0/24, 2 successors, FD is 2172416
via 172.12.123.2 (2172416/28160), Serial0/0
via 172.12.123.3 (2172416/28160), Serial0/0
P 172.12.123.0/24, 1 successors, FD is 2169856
via Connected, Serial0/0
Networks 2.2.2.2 and 3.3.3.3 have feasible successors routes that are pretty close to the successor routes in terms of cost, so I would like to load balance between unequal cost. Using the variance command I can set the variance between the successor metric to twice FD. Now the routing table has been updated with the load balancing routes.
R1(config)#router eigrp 100
R1(config-router)#variance 2
R1(config)#do show ip route eigrp
2.0.0.0/32 is subnetted, 1 subnets
D 2.2.2.2 [90/2297856] via 172.12.123.2, 00:00:15, Serial0/0
[90/2300416] via 172.12.123.3, 00:00:15, Serial0/0
3.0.0.0/32 is subnetted, 1 subnets
D 3.3.3.3 [90/2297856] via 172.12.123.3, 00:00:15, Serial0/0
[90/2300416] via 172.12.123.2, 00:00:15, Serial0/0
D 192.168.10.0/24 [90/2172416] via 172.12.123.2, 00:00:15, Serial0/0
[90/2172416] via 172.12.123.3, 00:00:15, Serial0/0
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