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I'm trying to set up chassis cluster on Juniper SRX300 (Junos 15.1X49-D45).

And I wasn't able to find any documentation on this matter.

I was able to run the command:

set chassis cluster cluster-id 0 node 0[1] reboot

on both nodes, but after the reboot cluster is not enabled:

root> show chassis cluster status
error: Chassis cluster is not enabled.

Is the anything else I should do?

Is there any special license required?

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You can find full documentation here.

You're on the right track, but cluster-id should be greater than 0. From the documentation:

Setting a cluster ID to 0 is equivalent to disabling a cluster. A cluster ID greater than 15 can only be set when the fabric and control link interfaces are connected back-to-back.

Keep in mind that you need to connect the two SRX300 devices on port ge-0/0/1 (for the control link). In the factory default configuration, this interface is already configured and part of a security zone; you need to remove all configuration relating to this interface before the chassis cluster will form.

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