Configuring Rmon; Overview; Rmon Groups - HPE FlexNetwork 5510 HI Series Network Management And Monitoring Configuration Manual

Configuring RMON

Overview

Remote Network Monitoring (RMON) is an enhancement to SNMP. It enables proactive remote
monitoring and management of network devices and subnets. An RMON monitor periodically or
continuously collects traffic statistics for the network attached to a port on the managed device. The
managed device can automatically send a notification when a statistic crosses an alarm threshold,
so the NMS does not need to constantly poll MIB variables and compare the results.
RMON uses SNMP notifications to notify NMSs of various alarm conditions such as broadcast traffic
threshold exceeded. In contrast, SNMP reports function and interface operating status changes such
as link up, link down, and module failure. For more information about SNMP notifications, see
"Configuring
HPE devices provide an embedded RMON agent as the RMON monitor. An NMS can perform basic
SNMP operations to access the RMON MIB.

RMON groups

Among standard RMON groups, HPE implements the statistics group, history group, event group,
alarm group, probe configuration group, and user history group. HPE also implements a private
alarm group, which enhances the standard alarm group. The probe configuration group and user
history group are not configurable from the CLI. To configure these two groups, you must access the
MIB.
Statistics group
The statistics group samples traffic statistics for monitored Ethernet interfaces and stores the
statistics in the Ethernet statistics table (ethernetStatsTable). The statistics include:
•
Number of collisions.
•
CRC alignment errors.
•
Number of undersize or oversize packets.
•
Number of broadcasts.
•
Number of multicasts.
•
Number of bytes received.
•
Number of packets received.
The statistics in the Ethernet statistics table are cumulative sums.
History group
The history group periodically samples traffic statistics on interfaces and saves the history samples
in the history table (etherHistoryTable). The statistics include:
•
Bandwidth utilization.
•
Number of error packets.
•
Total number of packets.
The history table stores traffic statistics collected for each sampling interval.
Event group
The event group controls the generation and notifications of events triggered by the alarms defined
in the alarm group and the private alarm group. The following are RMON alarm event handling
methods:
SNMP."
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