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Deciding how to split what you monitor via traps and what you
monitor via polls is more of an art than a science, and it depends
on the size of your internetwork, the interconnections in place, and
the criticality of the various variables you wish to monitor. A
reasonable starting point might be to poll key devices on a fairly
infrequent basis, say once every 10 minutes, to check that they are
functioning and accessible, then set traps for more detailed alerts,
such as individual links to remote sites going up or down. If you
really need to monitor specific MIB variables, such as dropped
packets or bandwidth utilization, you have to poll the remote device
for those particular values. This can place an unacceptable burden
on the bandwidth available for user traffic on a large and growing
internetwork. |
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