All MIBs › SNMP-USER-BASED-SM-MIB › usmStatsUnknownUserNames
usmStatsUnknownUserNames
Module: SNMP-USER-BASED-SM-MIB
OID (symbolic): SNMP-USER-BASED-SM-MIB::usmStatsUnknownUserNames
OID (numeric): 1.3.6.1.6.3.15.1.1.3
Node type: OBJECT-TYPE
Type: Counter32
Access: read-only
Description: The total number of packets received by the SNMP engine which were dropped because they referenced a user that was not known to the SNMP engine.
What is usmStatsUnknownUserNames?
This Counter32 counts SNMP packets the engine discarded because they referenced a username not present in its local usmUserTable. It helps an admin spot mistyped or unprovisioned SNMPv3 usernames, for instance a monitoring system still polling with an old username after a user was deleted or renamed on the device. Watching this counter climb after a credential rotation is a quick sign that not all pollers were updated with the new username.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.6.3.15.1.1.3 snmpwalk -v2c -c public <target> SNMP-USER-BASED-SM-MIB::usmStatsUnknownUserNames
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.6.3.15.1.1.3.1 snmpget -v2c -c public <target> SNMP-USER-BASED-SM-MIB::usmStatsUnknownUserNames.1
Start monitoring vendor-neutral, standards-based MIB, any device or host running an SNMPv3 agent (USM user credentials/security-violation counters) with a free 30-day trial of IPNetwork Monitor. Create custom SNMP monitor using the SNMP-USER-BASED-SM-MIB::usmStatsUnknownUserNames OID value, configure state conditions and alerts, and monitor any vendor-neutral, standards-based MIB, any device or host running an SNMPv3 agent (USM user credentials/security-violation counters) from a single console.
OID Breakdown
Upper-level ancestors (6 from the standard OID tree / other modules)
| Numeric OID | Name | Module |
|---|---|---|
| 1 | iso | LANART-AGENT |
| 1.3 | org | AirPair-MIB |
| 1.3.6 | dod | AirPair-MIB |
| 1.3.6.1 | internet | AirPair-MIB |
| 1.3.6.1.6 | snmpV2 | DASAN-DHCP-MIB |
| 1.3.6.1.6.3 | snmpModules | RAPID-CITY |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.6.3.15 | snmpUsmMIB | SNMP-USER-BASED-SM-MIB |
| 1.3.6.1.6.3.15.1 | usmMIBObjects | SNMP-USER-BASED-SM-MIB |
| 1.3.6.1.6.3.15.1.1 | usmStats | SNMP-USER-BASED-SM-MIB |
| 1.3.6.1.6.3.15.1.1.3 | usmStatsUnknownUserNames | SNMP-USER-BASED-SM-MIB |