RMON can be used to collect statistics at intervals. For example, if switch performance is monitored over a weekend, enough buckets to cover two days must be set aside. To do this, set the history to gather one bucket each hour, thus covering a 48-hour period. After history characteristics are set, they cannot be modified; the history must be deleted and another created.
Use the following procedure to establish a history for a port, and set the bucket interval.
The following table describes the fields of the Insert History dialog box.
Field | Description |
---|---|
Index | Indicates a unique value assigned to each interface. An index identifies an entry in a table. |
Port | Indicates any Ethernet interface on the device. |
BucketsRequested | Indicates the requested number of discrete time intervals over which data is to be saved in the part of the media-specific table associated with this entry. |
Interval | Indicates the interval in seconds over which the data is sampled for each bucket in the part of the media-specific table associated with this entry. You can set this interval to a number of seconds between 1 and 3600 (1 hour). Because the counters in a bucket may overflow at their maximum value with no indication, note the possibility of overflow in the associated counters. Consider the minimum time in which a counter could overflow on a particular media type and set the historyControlInterval object to a value less than this interval. This interval is typically most important for the octets counter in a media-specific table. For example, on an Ethernet network, the etherHistoryOctets counter could overflow in about one hour at the Ethernet's maximum utilization. |
Owner | Indicates the network management system that created this entry. |