On a device running SNMPv3 to communicate with the NMS, when you run the display trapbuffer command, you can see there are trap records in the trap buffer of the information center; however, the NMS cannot receive the traps from the device.
The device runs SNMPv3 to communicate with the NMS, but the trap message version is not specified on the trap destination. By default, the device sends traps in SNMPv1 version. Because the SNMP version set on the device is different from the SNMP version of trap messages sent by the device, the SNMP module on the device does not send trap messages. Despite not being sent, the generated trap messages are still stored in the trap buffer of the information center.
Run the display snmp-agent sys-info command to view the SNMP information, including system maintenance information, physical locations of devices, and SNMP version.
Run the display snmp-agent target-host command to view target host information, such as target host IP address, VPN instance name, trap sending mode, secure character for sending traps, protocol version, and security level.