3Com 3C15500 - Network Director - PC, User Manual, Page: 308 / 924

304 C
HAPTER
7: M
ONITORING THE
N
ETWORK
Changing Retry
Periods and Timeouts
Depending upon the topology and geographical distribution of your
network, access to some portions of your network may be slower or less
reliable than to other portions of your network.In particular, traffic to and
from remote sites may be carried over slow WAN links.
If communications with a portion of your network are particularly slow or
unreliable this may result in a loss of data. This may be due to either
3Com Network Director not giving the devices on that portion of the
network enough time to respond, or the traffic being discarded by the
network.
If monitoring data is not received in time, or is lost, then 3Com Network
Director may assume incorrectly that there are problems on your network.
3Com Network Director avoids this by allowing you to configure the retry
periods and timeouts for all traffic that it generates.
The mechanism for changing these settings is discussed in “Using 3Com
Network Director On A Multi-Site Network” on page 681 .
Controlling Event
Generation from
Monitors
3Com Network Director uses monitors to generate events.If a monitor
remains in a warning or high state for an extended period of time an
event will be generated.
The warning and high states for a monitor are determined from the
setting of a threshold for the monitor.This threshold specifies the state
that the monitor must reach to enter its high state.3Com Network
Director then derives a warning state from the threshold.For further
details on thresholds and how to change them see
“Setting Thresholds
for Monitor-Based Events” on page 356 .
3Com Network Director also provides a set of features, collectively known
as Smart Event Analysis, that work together to interpret the generated
events.These features include mechanisms to prevent events from being
generated when a monitor enters then immediately leaves an abnormal
state, and to combine multiple identical events into a single
recurring
event.For further details see “Smart Event Analysis” on page 324 .
Registering 3Com
Network Director as
an SNMP Trap
Destination
By default, 3Com Network Director will register itself as an SNMP trap
destination with any 3Com devices that it is monitoring.If you do not
wish 3Com Network Director to do this, uncheck the
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