AD and EIGRP

1. When receiving a new EIGRP update, Will it compare inside the EIGRP topology firstly and then AD?

Let's look at the sample.

10.1.0.0 learn from BGP and then redistributed into EIGRP on R1.

default-metric 10000 10 1 255 1500
distance 200 0.0.0.0 255.255.255.255 10
access-list 10 permit 10.1.0.0

Then R1 receives an new update from its neighbor R2 with 10000 1200 1 255 1500.

So from the eigrp topology perspective, the one redistributed from BGP has better metrci than the one from R2. But the AD for R2 is 170, and 200 for BGP. Which one is prefer????

Answer, it prefers the AD first. So in R1's routing table, 10.1.0.0 is from EIGRP instead of R2.