Technology Overview
Technology: Unicast/Multicast Testing Note
Most Ethernet testing is performed with unicast traffic. One tester generates unicast
frames that are received by the far end unit, which is either sending unicast traffic of
its own or looping the frames by swapping the source and destination addresses.
Furthermore, different test streams can be designated by their MAC addresses.
When testing multicast services, some care must be taken. Loopback devices will not
loop multicast (or broadcast) traffic. Also, the use of multicast MAC destination
addresses may cause problems designating test traffic. As shown below, the MAC
addresses sent by a tester do not match the MAC addressed received.
MAC Source
MAC Destination
Generated 00-D0-DD-12-34-56 01-00-5E-00-00-05
Received 00-D0-DD-AB-CD-EF
01-00-5E-00-00-06
Sample MAC Addresses
Thus, when running this test, the test summary will show "NO BERT TRAFFIC" since
the incoming traffic does not match that sent. Fortunately, all normal traffic statistics
and measurements can be made, with the exception of bit errors and BER.
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Summary of Contents for XTT 5000
Page 1: ...XTT 5000 User s Manual...
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Page 55: ...Throughput Testing L2 BERT Diagram Home Layer 2 BERT Where do you want to go next Home 49...
Page 58: ...XTT 5000 User s Manual Throughput Stream Results Throughput Test Setup Working Desktop Home 52...
Page 61: ...Throughput Testing Home 55...
Page 67: ...Throughput Testing Throughput Aggregate Results Throughput Stream Results Home 61...
Page 81: ...Throughput Testing Working Desktop Home 75...
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Page 147: ...Save Features 141 RFC2544 NE Applications IP Test Setup Monitor Setup Loopback Test Setup Home...
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