3.1.2 Polling
Polling is using SNMP and ICMP (pings) to periodically discover and monitor network devices. NNMi monitors the discovered network devices by performing polling based on the SNMP and ICMP protocols. NNMi monitors not only the statuses of network devices but also the statuses of the components (such as fans, power supplies, and voltages) of those devices. This enables a wide range of failure monitoring.
If you set an interval (in seconds, minutes, hours, or days), polling can be performed automatically and periodically. You can also perform polling manually when you want to perform polling immediately, for example, immediately after resolving a failure. You can set different polling conditions for multiple ranges, such as for each network device or for each node group. This enables you to change the interval of polling depending on the severity of each monitoring target.
- Note
There are two types of polling:
Polling for discovery
Polling for monitoring
The above two types of polling are referred to by the following names according to the purpose or situation:
Polling for discovery
Discovery polling (polling performed immediately by selecting the Actions menu, Polling, and then Configuration Poll)
Rediscovery polling (periodic polling to rediscover discovered nodes to check whether the configuration has changed)
Setting polling (polling for discovering settings)
Finding polling (polling for finding nodes)
Polling for monitoring
Status polling (polling performed immediately to monitor statuses by selecting the Actions menu, Polling, and then Status Poll)
State polling (polling for monitoring states)
Fault polling (polling for monitoring whether a failure has occurred)
Demand polling (polling for immediate monitoring when a manual operation is performed)