EIGRP metric calculations query

keith.straw · ‎09-08-2007

Can anyone assist ?

In the text books it says that the EIGRP metric is calculated using

a sum of the segment delays and the lowest segment bandwidth between the router and the destination etc.

My question is how does an EIGRP router know about the links between

its neighbor and the network it is doing a calculation for ?

Doesn't the neighbor only tell it about a remote network with an AD ? Not all the segment details in the

path from the neighbor to the network being advertised .

lgijssel · ‎09-09-2007

EIGRP uses these scaled values to determine the total metric to the network:

metric = [K1 * bandwidth + (K2 * bandwidth) / (256 - load) + K3 * delay] * [K5 / (reliability + K4)]

Please refer to the document below for more info:

regards,

Leo

keith.straw · ‎09-09-2007

Thanks Leo .

I understand it now .

these attributes are pass between

EIGRP routers and the with the total

delay being incremented and the min bandwidth updated if required .

eg

Vector metric:

Minimum bandwidth is 56 Kbit

Total delay is 41000 microseconds

Reliability is 255/255

Load is 1/255

Minimum MTU is 1500

Hop count is 1