Le routeur R4 n`utilise qu`un seul next hop pour atteindre le sous-réseau 6.6.6.0/24 :
R4#show ip route eigrp 400 5.0.0.0/24 is subnetted, 1 subnets D 5.5.5.0 [90/2297856] via 10.1.44.5, 01:48:32, Serial0/0 6.0.0.0/24 is subnetted, 1 subnets D 6.6.6.0 [90/2297856] via 10.1.44.6, 01:48:32, Serial0/0 10.0.0.0/24 is subnetted, 7 subnets D 10.1.156.0 [90/2172416] via 10.1.44.6, 01:48:32, Serial0/0 [90/2172416] via 10.1.44.5, 01:48:32, Serial0/0
La topologie EIGRP indique 2 routes possibles vers le sous-réseau 6.6.6.0/24 :
R4#show ip eigrp 400 topology 6.6.6.0/24 IP-EIGRP (AS 400): Topology entry for 6.6.6.0/24 State is Passive, Query origin flag is 1, 1 Successor(s), FD is 2297856 Routing Descriptor Blocks: 10.1.44.6 (Serial0/0), from 10.1.44.6, Send flag is 0x0 Composite metric is (2297856/128256), Route is Internal Vector metric: Minimum bandwidth is 1544 Kbit Total delay is 25000 microseconds Reliability is 255/255 Load is 1/255 Minimum MTU is 1500 Hop count is 1 10.1.44.5 (Serial0/0), from 10.1.44.5, Send flag is 0x0 Composite metric is (2300416/156160), Route is Internal Vector metric: Minimum bandwidth is 1544 Kbit Total delay is 25100 microseconds Reliability is 255/255 Load is 1/255 Minimum MTU is 1500 Hop count is 2
Le ratio entre les 2 metric est de 1,001 ( 2300416 / 2297856 )
La variance doit être donc de 2 pour loadbalancer entre les 2 liens :
R4(config)#router eigrp 400 R4(config-router)#variance 2
Vérifications :
R4#show ip route eigrp 400 5.0.0.0/24 is subnetted, 1 subnets D 5.5.5.0 [90/2300416] via 10.1.44.6, 00:00:43, Serial0/0 [90/2297856] via 10.1.44.5, 00:00:43, Serial0/0 6.0.0.0/24 is subnetted, 1 subnets D 6.6.6.0 [90/2297856] via 10.1.44.6, 00:00:43, Serial0/0 [90/2300416] via 10.1.44.5, 00:00:43, Serial0/0 10.0.0.0/24 is subnetted, 7 subnets D 10.1.156.0 [90/2172416] via 10.1.44.6, 00:00:43, Serial0/0 [90/2172416] via 10.1.44.5, 00:00:43, Serial0/0