Hi,
Please go through the following 2 links which have all the details of cluster deployment :-
https://kb.juniper.net/library/CUSTOMERSERVICE/GLOBAL_JTAC/technotes/3500165-EN.pdf
https://kb.juniper.net/library/CUSTOMERSERVICE/GLOBAL_JTAC/NT260/SRX_HA_Deployment_Guide.pdf
Regards,
Sahil Sharma
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