Commonly Used Rmon Groups - H3C S7500 Series Operation Manual

Operation Manual – SNMP and RMON
H3C S7500 Series Ethernet Switches
an NMS operating in this way can only obtain information about four groups
(instead of all the information in the RMON MIB). The four groups are alarm group,
event group, history group and statistics group.
An S7500 switch implements RMON in the second way. With the embedded RMON
agent, the S7500 series switch can serve as a network device with the RMON probe
function. Through the RMON-capable SNMP agents running on the Ethernet switch, an
NMS can obtain the information on 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 event indexes and the processing methods for 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:
Logging the event
Sending trap messages to the NMS
Logging the event and sending trap messages to the NMS
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 upper
threshold or lower 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:
Sampling the defined alarm variables (alarm-variable) once in each specified
period (sampling-time)
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 entries, you can perform operations on the samples of an alarm
variable and then compare the operation result with the set threshold, thus
implementing more flexible alarm functions.
With an extended alarm entry defined in an extended alarm group, the network devices
perform the following operations accordingly:
2-2
Chapter 2 RMON Configuration