Chapter 3 Ethernet Testing
MAC-in-MAC testing
106
HST-3000 Ethernet Testing User’s Guide
Ethernet traffic carried on a PBB (Provider Backbone Bridged)
trunk. When configuring the traffic, you specify a backbone
destination address (B-DA), backbone source address
(B-SA), and backbone tag (B-TAG) which designate the path
for the backbone frame to the destination. You can also char-
acterize the customer frame (carried in the backbone frame)
by specifying the frame type, I-TAG settings, encapsulation
settings, and frame size.
When analyzing MiM traffic, you can set up a filter on the
receiving instrument to observe test results for traffic sharing
the same B-TAG (tag settings for the backbone frame), I-TAG
(tag settings for the customer frames), customer frame
settings such as the frame type, encapsulation values, and
the pattern carried in the customer frame payload.
Understanding
MAC-in-MAC
test results
When the instrument is configured for MiM testing, a subset of
the standard layer 2 test results is provided for the backbone
and customer frames. When observing results for the back-
bone frames, B-TAG and I-TAG information is also provided.
Understanding
MAC-in-MAC
LEDs
In addition to the standard LEDs provided for layer 2 Ethernet
testing, a PBT Frame Detect LED is available which indicates
whether the unit has detected MiM traffic on the circuit.
Configuring
MAC-in-MAC
tests
Before transmitting or analyzing traffic on a PBB trunk, you
must select the appropriate MAC-in-MAC (MiM) test applica-
tion, specify interface settings, specify frame and frame filter
settings, and then configure the traffic load.
Instructions are provided in this section for the following:
–
“Initializing the link for MiM testing” on page 107
– “Specifying frame characteristics” on page 107
– “Configuring the traffic load” on page 109
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