eigrp question

i have a question about Eigrp cost. How would R1 travel through the network if the network had a other routes to get to R2? one route could be a T1, another combo of router with 100M and another route T3. the Eigrp config would be config as default without varience.

Since eirgp use Bandwidth and delay, i would assume it would route through the T3, which is more bandwidth than the T1 and combo of 100M combo routers. the icnd book explains the eigrp always take the lowest cost to route and gives you the cost #. how do you come out with the cost # to figure out the best cost path so packet can travel from R1 to R2.

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this should help

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For a quick answer...

Assuming equal delay paths, the path with the highest MINIMUM bandwidth will be used. (If a path contains both 100M and T3 links, the 100M is most significant).

Assuming equal bandwith paths, the path with the lowest TOTAL delay will be used.

Mixed BW/delay paths must be costed out using the formula on the wikipedia page given by "daytime."

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