ECMP and LAG based on L3 information
https://kb.juniper.net/InfoCenter/index?page=content&id=KB33884
Other Load balancing:
https://forums.juniper.net/t5/SRX-Services-Gateway/How-to-load-balance-on-SRX/td-p/314149
policy-options
root@SRX300-1-RL102# set policy-options policy-statement LOAD_BALANCE then load-balance ? Possible completions: consistent-hash Give a prefix consistent load-balancing per-packet Load balance on a per-packet basis [edit] consistent-hash : per flow Apply consistent load balancing to the routing policy so that only traffic flows to one or more destination prefixes that experience a link failure are redirected to an active link.