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Setting RMON Values
4-12 Configuring the RoamAbout Access Point
Setting RMON Values
The AP supports four of the nine Remote Network Monitoring MIB (RMON) groups:
Statistics, History, Alarm, and Event. However, the settings for these groups can only
be accessed with an NMS system. The console port and AP Manager can not change
or view the RMON group settings.
• Statistics - The Statistics group contains statistics measured by the probe for the
Wired LAN and the Wireless LAN interfaces.
• History - The History group records periodic statistical samples from a network
and stores them for later retrieval.
• Alarm - The Alarm group periodically takes statistical samples from variables in
the probe and compares them to previously configured thresholds. If the
monitored variable crosses a threshold, an event is generated.
• Event - The Event group controls the generation and notification of events from
this device.
When the AP is initialized, two statistics groups are generated: one for the Wired
interface and one for the Wireless interface. Also, two History groups are generated for
each interface: one with a short term polling period of thirty seconds and one with a
long term polling period of thirty minutes.
The AP has the following limits for the RMON MIB because of memory limitations:
• A maximum of six Statistics groups.
• A maximum of four History groups, each group allowing a maximum of fifty (50)
“buckets”, i.e., samples.
• A maximum of ten Alarm groups.
• A maximum of ten Event groups.
With an NMS system, you can reconfigure each group. For example, you could assign
80 buckets each to the long and short term History groups assigned to the Wired
interface, and 20 buckets each to the long and short term History groups assigned to
the Wireless interface. This example does not exceed the maximum of 200 buckets.