Related Documentation
- J Series
- Chassis Cluster Overview in the Junos OS Security Configuration Guide

- SRX Series
- Example: Configuring Logical Systems in an Active/Passive Chassis Cluster
- Example: Configuring Logical Systems in an Active/Passive Chassis Cluster (IPv6)
- Understanding the Interconnect Logical System and Logical Tunnel Interfaces
- Understanding Logical Systems for SRX Series Services Gateways
- Chassis Cluster Overview in the Junos OS Security Configuration Guide

Understanding Logical Systems in the Context of Chassis Cluster
The behavior of a chassis cluster whose nodes consist of SRX Series devices running logical systems is the same as that of a cluster whose SRX Series nodes in the cluster are not running logical systems. No difference exists between events that cause a node to fail over. In particular, if a link associated with a single logical system fails, then the device fails over to another node in the cluster.
The master administrator configures the chassis cluster (including both primary and secondary nodes) before he or she creates and configures the logical systems. Each node in the cluster has the same configuration, as is the case for nodes in a cluster not running logical systems. All logical system configurations are synchronized and replicated between both nodes in the cluster.
When you use SRX Series devices running logical systems within a chassis cluster, you must purchase and install the same number of licenses for each node in the chassis cluster. Logical systems licenses pertain to a single chassis, or node, within a chassis cluster and not to the cluster collectively.
Related Documentation
- J Series
- Chassis Cluster Overview in the Junos OS Security Configuration Guide

- SRX Series
- Example: Configuring Logical Systems in an Active/Passive Chassis Cluster
- Example: Configuring Logical Systems in an Active/Passive Chassis Cluster (IPv6)
- Understanding the Interconnect Logical System and Logical Tunnel Interfaces
- Understanding Logical Systems for SRX Series Services Gateways
- Chassis Cluster Overview in the Junos OS Security Configuration Guide


