Understanding Chassis Cluster Control Links

The control link relies on a proprietary protocol to transmit session state, configuration, and liveliness signals across the nodes.

On SRX5600 and SRX5800 devices, by default, all control ports are disabled. Each SPC in a device has two control ports, and each device can have multiple SPCs plugged into it. To set up the control link in a chassis cluster with SRX5600 or SRX5800 devices, you connect and configure the control ports that you will use on each device (fpcn and fpcn) and then initialize the device in cluster mode.

For SRX3400 and SRX3600 devices, there are dedicated chassis cluster (HA) control ports on the switch fabric board. No control link configuration is needed for SRX3400 and SRX3600 devices.

For SRX650 and SRX240 devices, the control link uses the ge-0/0/1 interface.

For SRX210 and SRX100 devices, the control link uses the fe-0/0/7 interface.

In a J Series chassis cluster, the control link is a physical connection between the ge-0/0/3 ports on each device, with both transformed into fxp1.

For details about port and interface usage for management, control, and fabric links, see SRX Series Chassis Cluster Slot Numbering and Port/Interface Naming and J Series Chassis Cluster Slot Numbering and Port/Interface Naming.

To set up the control link on J Series devices, you connect the control interfaces on the two devices back-to-back. When you initialize a device in cluster mode, Junos OS renames the control interface to fxp1 and uses that interface for the cluster control link. To enable the control link to transmit data, the system provides each fxp1 control link interface with an internal IP address.

Understanding Chassis Cluster Control Links

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