This sets the sampling interval, in seconds up to 65535, that will be applied to future auto-created RMON Ethernet history entries. As with the file-logging setting, this value only takes effect for history entries created after the change, so an admin standardizing on a new sampling interval across a chassis needs to know that already-existing auto-created entries on currently-active ports won't retroactively pick up the new value. For example, changing this from the default 1800 seconds (30 minutes) to 300 seconds (5 minutes) for finer-grained trending would only apply to ports that come up after the change.