Configure Sampling

set forwarding-options sampling instance trisul_sampling input rate 1024
set forwarding-options sampling instance trisul_sampling family inet output flow-server 10.10.100.100 port 2055
set forwarding-options sampling instance trisul_sampling family inet output flow-server 10.10.100.100 version9 template trisul_template 

Configure the Template

Name of template is trisul_template

set services flow-monitoring version9 template trisul_template flow-active-timeout 300
set services flow-monitoring version9 template trisul_template flow-inactive-timeout 60
set services flow-monitoring version9 template trisul_template template-refresh-rate seconds 60
set services flow-monitoring version9 template trisul_template option-refresh-rate seconds 120
set services flow-monitoring version9 template trisul_template ipv4-template
set services flow-monitoring version9 template trisul_template flow-key flow-direction

Attach sampler trisul_sampling to FPC

set chassis fpc 0 sampling-instance trisul_sampling

Create a firewall filter to sample traffic

set firewall family inet filter sample term sample then count sampled
set firewall family inet filter sample term sample then sample
set firewall family inet filter sample term sample then accept
set interfaces ge-0/0/0 unit 0 family inet filter input sample
set interfaces ge-0/0/0 unit 0 family inet filter output sample