Feature Request

As requested in #6918 an additional Feature request to start the discussion on SNMP Inform traps.

In SNMPv2 and SNMPv3 the InformRequest was added, this to send a reply once a SNMP Trap is received. The reply is sent as an acknowledgement of the received trap, to stop traps from being sent.

Proposal:

Add inform support to SNMP-Traps
http://www.net-snmp.org/tutorial/tutorial-5/commands/snmptrap-v3.html

Current behavior:

In our capture of traffic we see the traffic arriving but the inform is not presented in the exposed metrics of telegraf,

Below an SNMP traps without and with inform request:

07:49:44.829779 IP nlrott99-gm5120.testlab.net.43613 > rott99-app2002.snmptrap: C="xxxxxxxx" V2Trap(173) system.sysUpTime.0=9528 S:1.1.4.1.0=E:26866.1.1.11 E:26866.1.2.17="GigaVUE-OS" E:26866.1.2.1=3 E:26866.1.2.2="Fan Status Change" E:26866.1.2.19="1" E:26866.1.2.20=1

This below inform trap is received but dropped by the collector and no response is sent

07:49:17.911719 IP nlrott99-bs2010.testlab.net.32795 > rott99-app2002.snmptrap: C="xxxxxxx" Inform(57) system.sysUpTime.0=120308 S:1.1.4.1.0=E:15694.2.8.6

Desired behavior:

SNMP Inform should be accepted and sent a reply message, this to not get overloaded by inform traps.

Use case:

Traps of devices ares now not processed, in addition we want to use SNMPv3 because of security requirements.