You want to take a quick snap-shot of replication activity for one or more domain controllers.
22.214.171.124 Using a command-line interface
The following command will show the replication status of all the domain controllers in the forest:
> repadmin /replsum
You can also use * as a wildcard character to view the status of a subset of domain controllers. The following command will display the replication status of only the servers that begin with the name dc-rtp:
> repadmin /replsum dc-rtp*
The new /replsum option in repadmin is a great way to quickly determine if there are any replication issues. This command should be your starting point if you suspect any replication problems. If you are running /replsum against a lot of domain controllers, you can use the /sort option to order the returned table output by any of the table columns. You can also use the /errorsonly option to display only the replication partners who are encountering errors.