The NSX Manager receives system events that are informational, warning, and critical from for example, the NSX Edge and hypervisor. The SNMP agent forwards the SNMP traps with OIDs to the SNMP receiver.
SNMP traps must have the SNMPv2c version. The traps must be associated with a management information base (MIB) so that the SNMP receiver can process the traps with object identifiers (OID).
By default, the SNMP trap mechanism is disabled. Enabling the SNMP trap only activates the critical and high severity notifications so that the SNMP manager does not get inundated by a high volume of notifications. An IP address or a host name defines the trap destination. For the host name to work for the trap destination, the device must be set up to query a Domain Name System (DNS) server.
When you enable the SNMP service, a coldStart trap with OID 1.3.6.1.6.3.1.1.5.1 is sent out the first time. A warmStart trap with OID 1.3.6.1.6.3.1.1.5.2 is sent out later on each stop-start to the configured SNMP receivers.
If the SNMP service remains enabled, a heartbeat trap vmwHbHeartbeat with OID 1.3.6.1.4.1.6876.4.190.0.401 is sent out every five minutes. When you disable the service, a vmwNsxMSnmpDisabled trap with OID 1.3.6.1.4.1.6876.90.1.2.1.0.1 is sent out. This process stops the vmwHbHeartbeat trap from running and disables the service.
When you add, modify, or delete a SNMP receiver value, a warmStart trap with OID 1.3.6.1.6.3.1.1.5.2 and vmwNsxMSnmpManagerConfigUpdated trap with OID 1.3.6.1.4.1.6876.90.1.2.1.0.2 is sent to the new or updated set of SNMP receivers.
