I don’t have one handy, but keep in mind that the engineID used to encode the 
usmUser credentials, for both snmptrapd and the agent, is the one for snmptrapd 
itself, not the agent sending the INFORM:

With SNMPv3 informs, the authoritative engine ID is the engine that receives 
the inform, unlike SNMPv3 traps, where the agent's engine ID is authoritative.

So when you create the usmUser for the SNMP agent, you use the snmptrapd 
engineID.  Since the usmUser must exist in the agent configuration before it 
can send the INFORM, engineID discovery is useless for INFORMs (unlike queries 
like GET, GET-NEXT).

Hope this helps,
Brian

From: Feroz <feroz.afs...@gmail.com>
Sent: Wednesday, January 6, 2021 10:11 AM
To: net-snmp-users@lists.sourceforge.net
Subject: snmptrapd for V3 informs

NetApp Security WARNING: This is an external email. Do not click links or open 
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Anyone tried forwarding V3 informs with snmptrapd?
Can some one share the snmptrapd.conf file?

-Feroz
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