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Understanding Chassis Clusters

Chassis clustering, also known as the Junos Services Redundancy Protocol (JSRP), provides network node redundancy by grouping a pair of the same kind of supported Juniper Networks secure routers or SRX Series Services Gateways into a cluster. The devices must be running Junos OS with enhanced services.

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 node takes over processing of traffic. Nodes in a cluster are interconnected over Ethernet links and synchronize configuration, kernel, and session state across the cluster to facilitate high availability of interfaces and services.

The chassis cluster functionality includes:

  • Resilient system architecture, with a single active control plane for the entire cluster and multiple Packet Forwarding Engines, presents a single services gateway 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.