You must resume the Mirror Replication Agent instance to put it in Replicating state, so that it can read the mirror log devices and send replicated transactions to the Replication Server.
Resuming the Mirror Replication Agent
Log in to the Mirror Replication Agent administration port.
Start replication in the Mirror Replication Agent:
resume
Verify that the Mirror Replication Agent instance is in Replicating state:
ra_status
If the Mirror Replication Agent instance is not in Replicating state after you invoke the resume command, see the Mirror Activator Administration Guide, Chapter 4, “Troubleshooting Mirror Replication Agent.”