eigrp metric

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Apr 28th, 2008
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If i know the bandwidth and delay of 2 links connecting 2 routers together, how can i find out the total metric of eigrp for the 2 links? do i add them up? what is the formula to calculate eigrp bandwidth?

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Istvan_Rabai Mon, 04/28/2008 - 13:01
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Hi Navin,

For simplicity, the eigrp metric is calculated the following way:

1. You should find the lowest bandwidth link (in kilobits per second) along the path between the 2 routers.

2. You should sum up the delays (in microseconds) on all links along the path.

Both data can be found by using the "show interface" command.

3. Metric = 256*(10.000.000/minimum_bandwidth + sum_of_delays/10)

Take into account, that eigrp will take the integer value of the (10.000.000/minimum_bandwidth) calculation.

I had some headaches to find it out, as my calculations did not match the calculations of the routing protocol.

At last I realized I should have calculated the integer value as I mentioned above.




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