I have several host with snmp traps enabled.
Each host has two snmp interface set : one for the main ip of the server and one for his ilo or idrac.
When I set the snmp fallback trapper, I must chose an interface (the default is choosed it came from a template).
This trapper just don't check the other interface of the host.
In the documentation, it is explained that this kind of check will use all snmp interface of the host.
Of course, I can't set one fallback for each interface as zabbix won't allow it.
The only solution is to make two host instead of one... It's not really a good solution as I have 180 host and as much ilo and idrac...