There are 3 values in the SNMPv3 header that must match for the communication to take place: snmpEngineID, snmpEngineTime, snmpEngineBoots. The error received indicates a problem with the EngineID value: “authentication failure, Unknown Engine ID”
To specify the Engine ID, we can use the command “show snmp user”. The following example specifies the username as abcd with Engine ID: 00000009020000000C025808:
The “debug snmp packet” command displays all SNMP packets that are arriving and being replied to.
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