ok, I'm running Ripv2, IGRP and EIGRP on my 3 routers (lab environment) Each router is running all 3 of those routing protocols. Ripv2 and EIGRP are auto-summarizing.
When I disable EIGRP's auto summary, I notice "I's" start appearing in my routing table on some of my routers.
I know that diabling auto-summary lets the routing protocol advertise the REAL subnet mask (instead of the summarization).
-But, why does IGRP take over some of the routes EIGRP was taking care of? Th AD of EIGRP is lower...shouldnt it ALWAYS beat out IGRP?
I'm confused on why disabling auto-summarization in EIGRP, lets another routing protocol (with a higher AD) control that route. What relation does auto-summarization have with AD?