Allied Telesis AT-S29 - Manual (Page 128)

Advanced Topics
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Remote Monitoring
Remote Monitoring (RMON) provides a cost-effective way to monitor
large networks by placing embedded or external probes on distributed
network equipment (hubs, switches or routers). The provided network
management software can access the probes embedded in recent Allied
Telesyn network products to perform traffic analysis, troubleshoot
network problems, evaluate historical trends, or implement proactive
management policies. RMON has already become a valuable tool for
network managers faced with a quickly changing network landscape
that contains dozens or hundreds of separate segments. RMON is the
only way to retain control of the network and analyze applications
running at multi-megabit speeds. It provides the tools you need to
implement either reactive or proactive policies that can keep your
network running based on realtime access to key statistical information.
This switch provides support for RMON which contains the four key
groups required for basic remote monitoring. These groups include:
Statistics: Includes all the tools needed to monitor your network for
common errors and overall traffic rates. Information is provided on
bandwidth utilization, peak utilization, packet types, errors and
collisions, as well as the distribution of packet sizes.
History: Can be used to create a record of network utilization, packet
types, errors and collisions. You need a historical record of activity to be
able to track down intermittent problems. Historical data can also be
used to establish normal baseline activity, which may reveal problems
associated with high traffic levels, broadcast storms, or other unusual
events. Historical information can also be used to predict network
growth and plan for expansion before your network becomes too
overloaded.
Alarms: Can be set to test data over any specified time interval, and can
monitor absolute or changing values (such as a statistical counter
reaching a specific value, or a statistic changing at a certain rate over the
set interval). Alarms can be set to respond to either rising or falling
thresholds.
Events: Defines the action to take when an alarm is triggered. The
response to an alarm can include recording the alarm in the Log Table or
sending a message to a trap manager. Note that the Alarm and Event
Groups are used together to record important events or immediately
respond to critical network problems.