How does EIGRP route based on bandwith and delay?

[NetOpsTech]

How does EIGRP route based on bandwith and delay?

if I have 3 paths to a destinaton

r1 - 100 speed / 30 delay
r2 - 100 speed / 10 delay
r3 - 1000 speed / 20 delay

what path would eigrp take?

 

[Minue]

Will out doubt ! t will take the "r3 - 1000 speed / 20 delay" first then R2.
Regards

 

[NetOpsTech]

why? What's the formula?

 

[Minue]

Hi
Eigrp uses bandwith and delay by defaut.Higher bandwith and lower delay is better.Note thatdelay has to be configure.Will post you the formula later.
Regards

 

[jneiberger]

Take a look at this link. It does a good job of explaining it:

http://www.rhyshaden.com/eigrp.htm

 

[NetworksMD]

In your example you have 3 routes that in theory have 1 hop to the destination. In many cases you have multiple hops and potentially multiple bandwidth and interface types. In that case EIGRP uses the lowest bandwidth in the path and adds up the delay of all interfaces in USEC (Microseconds) to determine the best path.