The chassis Cluster in the Primary/Disabled state, needs to know the Root cause. 

• SRX goes to disable mode in the HA chassis cluster.
• CHASSIS CLUSTER GOES INTO DISABLE DUE TO FPC0 OFFLINE.

++ status of Node1 is disable: 


> show chassis cluster status

Node   Priority Status               Preempt Manual   Monitor-failures

Redundancy group: 0 , Failover count: 4
node0  100      primary              no      no       None
node1  1        disabled             no      no       None

Redundancy group: 1 , Failover count: 6
node0  100      primary              no      no       None
node1  0        disabled             no      no       IF


++FPC status is offline:

> show chassis fpc detail no-forwarding

Slot 0 information:
  State                               Offline
  Reason                              Chassis cluster disable
  Total CPU DRAM                 2048 MB
  Total SRAM                        0 MB
  Total SDRAM                       0 MB
  Temperature                      Testing


From chassisd and jsrpd the chassis cluster goes into disable due to FPC0 offline:

Jul 11 01:04:56 SRX chassisd[61165]: CHASSISD_RECONNECT_SUCCESSFUL: Successfully reconnected on soft restart

Jul 11 01:04:59 SRX chassisd[61165]: CHASSISD_SNMP_TRAP7: SNMP trap generated: Fru Ok (jnxFruContentsIndex 2, jnxFruL1Index 2, jnxFruL2Index 1, jnxFruL3Index 0, jnxFruName node1 Power Supply 0, jnxFruType 7, jnxFruSlot 2)

Jul 11 01:06:19 SRX jsrpd[25476]: JSRPD_RG_STATE_CHANGE: Redundancy-group 0 transitioned from 'ineligible' to 'disabled' state due to Ineligible timer expired

Jul 11 01:06:19 SRX jsrpd[25476]: JSRPD_NODE_STATE_CHANGE: Node1 entering disabled state due to control-link failure

Jul 11 01:06:19 SRX jsrpd[25476]: JSRPD_RG_STATE_CHANGE: Redundancy-group 1 transitioned from 'ineligible' to 'disabled' state due to Ineligible timer expired

Jul 11 01:06:19 SRX chassisd[61165]: CHASSISD_FRU_OFFLINE_NOTICE: Taking FPC 0 offline: Chassis cluster disable

Jul 11 01:06:19 SRX chassisd[61165]: CHASSISD_SNMP_TRAP3: ENTITY trap generated: entStateOperDisabled (entPhysicalIndex 24, entStateAdmin 3, entStateAlarm 0)


As the FPC is offline, we need to try reseating the card (only applicable to high-end devices) and rebooting the node. After rebooting, both FPCs should come online if it is a transient hardware failure, and the chassis cluster becomes a healthy primary/secondary.

First Version
2023-10-19:  Article reviewed for accuracy; Minor non-technical changes needed. 

The below KB might help:  https://supportportal.juniper.net/s/article/SRX-Troubleshooting-steps-if-the-Chassis-Cluster-is-in-Primary-Disabled-State