Examples of repadmin usage:

1) repadmin /showrepl    ; for AD DS
repadmin /showrepl admserver1:10389    ; for AD LDS

2) repadmin /kcc    ; for AD DS
repadmin /kcc admserver1:10389    ; for AD LDS

3) repadmin /replsum /bysrc /bydest /sort:delta    ; for AD DS
repadmin /replsum /bysrc /bydest /sort:delta  admserver1:10389    ; for AD LDS

4) repadmin /removelingeringobjects …
repadmin /removelingeringobjects addc01.mydomain.net 717e721c-b69d-4dd8-97b3-54454df6d197 DC=Mydomain,DC=NET /advisory_mode

repadmin /removelingeringobjects addc01.mydomain.net 717e721c-b69d-4dd8-97b3-54454df6d197 CN=Configuration,DC=Mydomain,DC=NET /advisory_mode

5) repadmin /replsummary

6) repadmin /syncall /?

repadmin /syncall <DC NAME>  /APed ; to force replication from this particular DC – /A(ll partitions) P(ush) e(nterprise, cross sites) d(istinguished names) parameters

repadmin /syncall <DC Name> /Pe CN=schema,CN=Configuration,DC=mydomain,DC=net   ; to force replication of the Schema Partition only

repadmin /queue * ; to see what your replication backlog is currently in the queue

================================ Reference articles ====================================

Repadmin examples: http://technet.microsoft.com/en-us/library/cc773062%28v=ws.10%29.aspx