When a device is managed by an NMS through SNMP and an EVPN link goes Down, no alarm is reported to the NMS.

Trouble Ticket Number	DTS2023121809187
Symptom	When a device is managed by an NMS through SNMP and an EVPN link goes Down, no alarm is reported to the NMS.
Condition	A device is managed by an NMS through SNMP and an EVPN link goes Down.
Impact	Alarms are not reported to the SNMP NMS.
Severity	Info
Root Cause	The function of reporting this alarm to the SNMP NMS is not supported.
Solution	The function of reporting this alarm to the SNMP NMS is supported.
Solution Impact	None
Problem Resolved in	V300R23C00SPC100
Involved Models	AR651-LTE6EA, AR651, AR651W, AR651W-8P, AR651U-A4, AR657W, AR651K, AR6200 series, AR6300 series
Precaution	An alarm is reported 3 seconds after an EVPN link goes Down. If the EVPN link status changes to Up within 3 seconds, no alarm will be reported. After installing the patch, run the connection snmp alarm enable command for the function to take effect.