Hello @St0neline ,
EIGRP exchanges routing updates the most important thing to note is that each prefix is associated with the metric component values from the point of view of the sender.
In other words instead of sending the metric a single number the EIGRP sender will send the prefix with accompanying values of cumulative delay in tens of microseconds minimum bandwdith on the path, max load, min realibility and MTU value.
This helps the receiving router in calculating the metric from its own point of view:
with standard K values it is enough to do the following:
add the delay of the receiving interface to the received cumulative delay in Reported Distance
Compare the min BW in Reported Distance with the bandwidth value on the receiving interface if it is bigger the min BW is left unchanged.
Also to be noted EIGRP does not need to refresh routing information. Only new routes or changes are to be sent this is for the DUAL algorythm.
Multiple routes of equal metric can be advertised as EIGRP supports ECMP
Hope to help
Giuseppe
