At least it OUGHT to be simple
I have a little EIGRP lab up and running, one entry in my topology table reads:
P 188.8.131.52/16, 1 successors, FD is 2297856
--via 184.108.40.206 (2297856/128256), Serial0
So I'm trying to make sure I understand the metric calculation (using default K values). The sum of (10,000,000 divided by BW in kbps, plus delay (in 10's of microseconds)) multiplied by 256.
So I took the FD, 2297856, divided by 256, and got 8976.
Delay on Serial0 (the peer at S0 is the last stop; there are no other interfaces in the path) is 20000 microsec. That's 2000 tens of usec, so I subtract and get 6976.
So far so good. Declared BW on the link is good ol' 1544 kbps. I divide that into 10,000,000 and get 6476.6839bla bla bla.
Except I was expecting something more in the neighborhood of the 6976 I was working with a moment ago. What have I missed? Why have I missed it by 500?