In Juniper SRX cluster firewalls, we have always managed to poll the SNMP information thru the management port. In ourcluster, we have interface fxp0 as the management interface. Basic SNMP configuration can be easily found from Juniper support site. Below is a simple configuration.
# Basic SNMP information
set snmp location "JUNIPER-SRX240"
set snmp contact "IT ServiceDesk ([email protected])"
# SNMP read-only communitiy with restricted source network
set snmp community public authorization read-only
set snmp community public clients 10.10.10.0/24
set snmp community public clients 0.0.0.0/0 restrict
# SNMP read-write communitiy with restricted source network
set snmp community private authorization read-write
set snmp community private clients 10.10.10.0/24
set snmp community private clients 0.0.0.0/0 restrict
# Enable SNMP Access on the interface other than the management port
set security zones security-zone trust host-inbound-traffic system-services snmp
# (Optional) For SNMP Debugging - use "show log snmptrace"
set snmp traceoptions file snmptrace
set snmp traceoptions flag all