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12.7.2 Single NetProbe 2000 or Dual NetProbe 2000 Test Scenario
The simplest RFC 2544 test scenario is to have a NetProbe 2000 send
the Framed Layer 1 RFC 2544 traffic to a hard loop. Most likely
though, you will want to test ISO layers 2-4 and for that scenario,
you will need a remote NetProbe 2000 running loop back at the
remote end. The remote NetProbe 2000 will swap MAC source and
destination addresses for Layer 2 testing and swap source and
destination IP addresses for Layer3 testing.
A more complex scenario is to test in each direction with two
NetProbe 2000s running back to back. With this back to back
approach, the two units perform an asymmetrical SLA
measurement, providing RFC 2544 results per direction. This scenario’s main strength is that it quickly pinpoints which
direction has not been configured properly or is at fault while providing performance metrics per direction.
The dual test-set approach also provides the capability to
segment the network and quickly pinpoint in which
direction issues occur. This is especially important where
bandwidth is different between the upstream and
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