Explanation/Reference:
Explanation
From the output, we learn that all the External OSPF routes have metrics of 100 (the second parameters in
[110/100]). This is not the default metric of OSPF Type 2 External route (the default value is 20) so the metrics of redistributed routes have been modified. Maybe when redistributing into OSPF, the metric in the redistribute command or the default-metric command was used on router B & C to assign the metric of these routes. Something like this:
router ospf 1
redistribute eigrp 1 metric 100 subnets
or
router ospf 1
.....
default-metric 100
Therefore even if we use the metric type E1 the problem still exists because the link B-D & C-D seems to have the same metric -> the total metrics remains the same .
We can use route-map and set different metrics for each networks but some unshown networks will have the same issues -