EIGRP Unequal load sharing is pretty straightforward. We just need to modify ‘variance’ value in respective Devices. Of cause routes have to be feasible successor. For traffic share ratio, we have to modify metric of those path by changing bandwidth value or delay value.
Let see below small topology and objective.
EIGP pre-configuration
From R1 to R5
Interface bandwidth from R1>R4>R5 are 10Mb.
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Objective : Traffic from R1 lo0 interface to R5 lo0 interface should be load sharing with the ration 20/5/1 which mean 20 packet to R1>R2>R5, 4 packets to R1>R3>R5, 1 packet to R1>R4>R5.
Before doing that, we need to have EIGRP metric calcualte formula (As only K1 and K3 are not 0 by default).
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As we need to modify bandwidth and delay value based on given metric, we simply change the formula as follows:
Let start,
This is topology of R5 lo0 in R1
First we will emphasize first two links which si 20 to 5 ratio. It is same as 4 to 1 ratio.
Looking at the feasible distance of ‘158720’ through R1>R2>R5. Fa1/1 of R1(R1>R3>R5) would need tohave 4 time higher than to achieve 4 to 1 ratio. (4×158720 = 634880). We need put that metric to formula to get bandwidth value.
In the end, we want to have 20/5/1 ratio, we have to put variance value to 20 and configure Fa1/1 of R1 to bandwidth value of 5102 Kb.
Let see traffic share ratio
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We now have 1 to 4 ratio. Let focus on third one. The metric need to be 20×158720 = 3174400. Let put it into formula to get bandwidth. Keep in mind that delay in this path is 7000.
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Before we move forward that, Reported Distance of path R1>R4>R5 should be lower than FD. So we modify the bandwidth value of Fa2/1 of R4 to 1GB.
Ok now we have path R1>R4>R5 in routing table of R1.
We now modify the bandwidth value of R1’s Fa2/0 which is R1>R4>R5 link to 855 Kb.
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Now we have the ratio of 20/5/1.