Chassis clustering is a high availability feature that allows two SRX Series devices to operate as a single logical device. The two devices are connected by a control link and a fabric link, which are used to synchronize the configuration, state, and traffic between the nodes. The cluster nodes are identified in the following ways:
A cluster is identified by a cluster ID (cluster-id) specified as a number 1 through 151.
A cluster node is identified by a node ID (node) specified as a number from 0 to 11.
Therefore, the node ID is used to identify each device in the chassis cluster (option B), and the cluster ID is used to identify each device in the chassis cluster (option D). The node ID value does not range from 1 to 255 (option A), and a system reboot is notrequired to activate changes to the cluster (option C)2. References: Chassis Cluster Overview, Configuring Chassis Clustering on SRX Series Devices
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