9.8.2 SnmpTrap (Alarm) 
The SNMP trap is a type of entrance. When this entrance is reached, the SNMP 
managed devices actively notify the NMS, instead of waiting for the polling of 
NMS. On an SNMP-enabled network, the agents on managed devices can report errors 
to the NMS anytime, without the need of waiting for the polling of NMS. The errors 
are reported to the NMS through traps. 
Method for enabling SnmpTrap for the gateway: 
Click "Administration >> NMP >> SnmpTrap". Enter the IP address of the NMS. Enter 
the corresponding group name when v1c or v2c is selected, or the corresponding 
user name when v3c is selected, ensuring that the name consists of 1–32 
characters. By default, the UDP port ID ranges from 1 to 65535.