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Path measurement: Difference between revisions
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== Overview == | == Overview == | ||
The main device captures packet meta data from the remote (or client) device which takes only a fraction of the total traffic. | The main device captures packet meta data from the remote (or client) device which takes only a fraction of the total traffic. Approximately 5% additional bandwidth is required for this capture connection. So for fully loaded 100 Mbit/s connection to the remote location an additional load of ~5 Mbit/s is required to get packet information to the main device. | ||
Approximately 5% additional bandwidth is required for this capture connection. | |||
So for fully loaded 100 Mbit/s connection to the remote location an additional load of ~5 Mbit/s is required to get packet information to the main device. | |||
The measurement connection can be a separate line or can be run over the line that is measured, the capture connection will be automatically ignored for the measurement. | The measurement connection can be a separate line or can be run over the line that is measured, the capture connection will be automatically ignored for the measurement. | ||
The measurement module must be configured with a maximum packet delay. | |||
This delay describes the amount of time the main device waits for packet information to arrive from the remote device. | The measurement module must be configured with a maximum packet delay. This delay describes the amount of time the main device waits for packet information to arrive from the remote device. The delay must be large enough to cover the actual latency of the connection and delay of the capture connection. Typical values are between 2 and 5 seconds. Larger values requires more memory to buffer packet meta data so very large values might only be selectable on larger Multimeter devices (Allegro 1000 or greater). | ||
The delay must be large enough to cover the actual latency of the connection and delay of the capture connection. | |||
Typical values are between 2 and 5 seconds. Larger values requires more memory to buffer packet meta data so very large values might only be selectable on larger Multimeter devices (Allegro 1000 or greater). | |||
== Configuration live measurement == | == Configuration live measurement == | ||