To manually failover the primary Routing Engine in an SRX Series high availability cluster pair, you need to issue the request chassis cluster failover redundancy-group group-id node node-id command on the primary node, where group-id is the redundancy group number and node-id is the node number of the secondary node. This command initiates a graceful failover of the specified redundancy group to the secondary node, making it the new primary node. The other options are not necessary or correct for this task. Option A would disable the chassis cluster and reboot the primary node, which is not a graceful failover. Option B is not relevant, as the control link recovery solution is used to restore the control link connectivity between the nodes, not to initiate a failover. Option D would not trigger a failover, as the priority of the secondary node would only take effect after a reboot or a control link failure. References:
Chassis Cluster Redundancy Group Manual Failover
Initiating a Chassis Cluster Manual Redundancy Group Failover
SRX Getting Started - Troubleshoot High Availability (HA)
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