This article provides the reason behind the stateful replication in disabled state:

LAB_re> show task replication 

    Stateful Replication: Disabled

    RE mode: Master

Upon running show task replication command on the device, sometimes we would see stateful replication in disabled state:

LAB_re> show task replication 

    Stateful Replication: Disabled

    RE mode: Master

The above command displays nonstop active routing (NSR) status. When you issue this command on the primary Routing Engine, the status of nonstop active routing synchronization is also displayed.

If we see the stateful replication in disabled state on primary routing engine, this indicates that the Non stop active routing is deactivated or disabled.

LAB_re> show task replication 

    Stateful Replication: Disabled

    RE mode: Master

The above output is expected, as we have deactivated the nonstop-routing.

LAB_re> show configuration | match nonstop | display set 

set routing-options nonstop-routing

deactivate routing-options nonstop-routing

Once we enable the nonstop-routing on the device, similar output as below will be observed once the protocol synchronisation is completed:

LAB_re> show task replication
         Stateful Replication: Enabled
         RE mode: Master

     Protocol                Synchronization Status
     OSPF                    Complete
     BGP                     Complete
     IS-IS                   Complete
     LDP                     Complete
     PIM                     Complete

Same has been shared in the below mentioned Techpub:

https://www.juniper.net/documentation/us/en/software/junos/high-availability/topics/ref/command/show-task-replication.html

2023-09-12: Initial version