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Understanding Chassis Cluster

Chassis clustering provides network node redundancy by grouping a pair of the same kind of supported J-series devices or SRX-series devices into a cluster. The devices must be running JUNOS software. The two nodes back up each other, with one node acting as the primary and the other as the secondary, ensuring stateful failover of processes and services in the event of system or hardware failure. If the primary node fails, the secondary takes over processing of traffic. Nodes in a cluster are interconnected over Gigabit Ethernet links and synchronize configuration, kernel, and session state across the cluster to facilitate high availability of interfaces and services.

Note: For an SRX-series chassis cluster, nodes can also be interconnected over 10-Gigabit Ethernet links.

Note: For a chassis cluster with SRX 5600 or SRX 5800 devices, nodes must be interconnected with a fiber optic cable.

Chassis cluster functionality includes:

Resilient system architecture, with a single active control plane for the entire cluster and multiple Packet Forwarding Engines. This architecture presents a single device view of the cluster.
Synchronization of configuration and dynamic runtime states between nodes within a cluster.
Monitoring of physical interfaces, and failover if the failure parameters cross a configured threshold.

Understanding Chassis Cluster

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