Ethernet history records periodic statistical samples from a network. A sample is called a history and is gathered in time intervals referred to as buckets.
Histories establish a time-dependent method for gathering RMON statistics on a port. The default values for history are the folowing:
You can configure the time interval and the number of buckets. However, when the last bucket is reached, bucket 1 is dumped and recycled to hold a new bucket of statistics. Then, bucket 2 is dumped, and so forth.
Use the following procedure to view RMON history.
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Step | Action |
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1 |
From the navigation tree, double-click Serviceability. |
2 |
In the Serviceability tree, double-click RMON. |
3 |
In the RMON tree, double-click Control. |
4 |
On the work area, click the History tab to view the history. |
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Use the data in the following table to help you create the RMON history characteristics.
Variable | Value |
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Index | A unique value assigned to each interface. An index identifies an entry in a table. |
Port | 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. |
BucketsGranted | Indicates the number of discrete sampling intervals over which data is saved in the part of the media-specific table associated with this entry. The actual number of buckets associated with this entry can be less than the value of this object. In this case, at the end of each sampling interval, a new bucket is added to the media-specific table. |
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 any number of seconds between 1 and 3600 (1 hour). Because the counters in a bucket can overflow at their maximum value with no indication, note the possibility of overflow in any of the associated counters. Consider the minimum time in which any counter could overflow on a particular media type and set the historyControlInterval object to a value less than this interval. This minimum time is typically most important for the octets counter in any media-specific table. For example, on an Ethernet network, the etherHistoryOctets counter could overflow in about 1 hour at the maximum utilization of the Ethernet. |
Owner | Indicates the network management system that created this entry. |