To disable/enable replication use these commands:
Disable it:
repadmin /options <Servername>:5000 +DISABLE_OUTBOUND_REPL
repadmin /options <Servername>:5000 +DISABLE_INBOUND_REPL
Enable it:
repadmin /options <Servername>:5000 -DISABLE_OUTBOUND_REPL
repadmin /options <Servername>:5000 -DISABLE_INBOUND_REPL
It is important to provide the servername:port before the flag, otherwise the command fails.
Source: