Forces the KCC on targeted domain controller(s) to immediately recalculate its inbound replication topology. By default, ...

Forces the KCC on targeted domain controller(s) to immediately
     recalculate its inbound replication topology.
     
     By default, each DC performs this recalculation every 15 minutes. 
     Run this command to troubleshoot KCC errors after removing suspected fault
     conditions, or to "activate" newly created manual connection objects.

     [SYNTAX]
     
     /kcc [DSA_LIST] [/async]

     [EXAMPLES]

     The following command targets all DC's in the site HQ and triggers the KCC
     to run on each one.

     repadmin /kcc site:HQ