Using repadmin.exe it is really easy to quickly force a replication across all Domain Controllers.
Simply use the command:
Repadmin /syncall DCName /APed
An explanation of the switches – /syncall obviously syncs all DCs. APed is the parameters A(ll partitions) P(ush) e(nterprise, cross sites) d(istinguished names)
Repadmin is a very handy tool you can even see the queue of items waiting to be synced by running
Repadmin /queue *