H3C Technologies H3C MSR 50 - Manual (Page 31)

Private alarm group
The private alarm group calculates the values of alarm variables and compares the results with the
defined threshold for a more comprehensive alarming function.
The system handles the private alarm entry (as defined by the user) in the following ways:
• Periodically samples the private alarm variables defined in the private alarm formula.
• Calculates the sampled values based on the private alarm formula.
• Compares the result with the defined threshold and generates an appropriate event if the threshold
value is reached.
If a private alarm entry crosses a threshold multiple times in succession, the RMON agent generates an
alarm event only for the first crossing. For example, if the value of a sampled alarm variable crosses the
rising threshold multiple times before it crosses the falling threshold, only the first crossing triggers a rising
alarm event.
Configuring the RMON statistics function
The RMON statistics function can be implemented by either the Ethernet statistics group or the history
group, but the objects of the statistics are different, as follows:
• A statistics object of the Ethernet statistics group is a variable defined in the Ethernet statistics table,
and the recorded content is a cumulative sum of the variable from the time the statistics entry is
created to the current time. For more information, see "Configuring the RMON Ethernet statistics
function."
• A statistics object of the history group is the variable defined in the history record table, and the
recorded content is a cumulative sum of the variable in each period. For more information, see
"Configuring the RMON history statistics function."
Configuring the RMON Ethernet statistics function
Step Command
31. Enter system view. system-view
32. Enter Ethernet interface view. interface interface-type interface-number
33. Create an entry in the RMON statistics
table.
rmon statistics entry-number [ owner text ]
You can create one statistics entry for each interface, and up to 100 statistics entries on the device. After
the entry limit is reached, you cannot add new entries.
Configuring the RMON history statistics function
Follow these guidelines when you configure the RMON history statistics function:
• The entry-number for an RMON history control entry must be globally unique. If an entry number
has been used on one interface, it cannot be used on another.
• You can configure multiple history control entries for one interface, but must make sure their entry
numbers and sampling intervals are different.
• The device supports up to 100 history control entries.
18