Operation Manual – SNMP and RMON
Quidway S3900 Series Ethernet Switches-Release 1510 Chapter 2 RMON Configuration
Huawei Technologies Proprietary
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switch, an NMS can obtain the information about the total traffic, error statistics and
performance statistics of the network segments to which the ports of the managed
network devices are connected. Thus, the NMS can further manage the networks.
2.1.2 Commonly Used RMON Groups
I. Event group
The event group is used to define the indexes of events and the processing methods of
the events. The events defined in an event group are mainly used in alarm group and
extended alarm group to trigger alarms.
You can specify a network device to act in one of the following ways in response to an
event:
z Logging the event
z Sending trap messages to the NMS
z Logging the event and sending trap messages to the NMS
z No processing
II. Alarm group
RMON alarm management enables monitors on specific alarm variables (such as the
statistics of a port). When the value of a monitored variable exceeds the threshold, an
alarm event is generated, which triggers the network device to act in the set way.
Events are defined in event groups.
With an alarm entry defined in an alarm group, a network device performs the following
operations accordingly:
z Sampling the defined alarm variables (alarm-variable) once in each specified
period (sampling-time)
z Comparing the sampled value with the set threshold and triggering the
corresponding events if the sampled value exceeds the threshold
III. Extended alarm group
With extended alarm entry, you can perform operations on the samples of an alarm
variable and then compare the operation result with the set threshold, thus implement
more flexible alarm functions.
With an extended alarm entry defined in an extended alarm group, the network devices
perform the following operations accordingly:
z Sampling the alarm variables referenced in the defined extended alarm
expressions once in each specified period
z Performing operations on sampled values according to the defined operation
formulas
z Comparing the operation result with the set threshold and triggering
corresponding events if the operation result exceeds the threshold.
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