When a VDC that is primary AED fails we have found that it takes 10 seconds or more to fail over to secondary. In addition to the outage created by the intial failure an additional AED preempt takes place creating a second outage. With that said we are looking for documentation that explains how to shorten our convergence times. If we are able to get the convergence times low enough then the second outage would not be as much of a problem. If we cannot shorten the covergence times we would like to disable preempt of AED and fail back during a controlled window of time. We have a default configuration for ISIS and have not adjusted any timers. If anyone has any configuration suggestions please respond.
Did you find solution for you problem. With second failure during AED preemption ? I have NX-OS 6.2(12) and observing same problem, but with longer failures times. In my case I have about 5-10 min outage, till connection is tabilized.