Template:FAQ:Agent 33

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These trees do not need any explicit configuration, and should be present automatically.

However the C code necessary to implement these particular MIB modules are not supported on all operating systems. These trees will be omitted on any system for which there is no underlying code. Currently, they are only supported on Linux, HP-UX (memory only), Solaris, BSDi (vmstat on BSDi4 only), Dynix, FreeBSD, NetBSD and OpenBSD.
If you want to help port it to other systems, let us know.

Note that these subtrees only report the current usage when explicitly queried. They do not automatically generate traps when the usage strays outside the configured bounds. See the earlier FAQ entry What traps are sent by the agent? or the snmpd.conf section on active monitoring, for more information