Chapter 3 Ethernet Testing
Loopback testing
HST-3000 Ethernet Testing User’s Guide
89
If you are running a multiple-stream test, the filters are
automatically configured for you and can not be
changed.
b Press the Action soft key, select Loop, and then
select LLB to put the unit in loop back mode.
7 On the near end HST, press the Action soft key, then
select one of the following:
– Start Traffic (if you configured a constant, bursty, or
flooded load).
– Start Ramp (if you configured a ramped traffic load).
When the far end HST receives the traffic, it does the
following:
– Determines which frames or packets satisfy its filter
criteria. Only traffic that satisfies the criteria will be
looped back to the near end unit.
– Swaps the destination and source MAC or IP address,
and if applicable, port number for every frame or
packet it receives.
– Transmits the traffic back to the unit on the near end.
Traffic is looped back to the local unit.
To loop down the far end HST:
1 On the near end unit, press the Action soft key, then
select Stop Traffic or Stop Ramp.
2 On the far end unit, select LLB.
The unit is looped down.
Using the
automatic
loopback
feature
You can perform an automatic loopback by selecting the
Loop Up action button on the traffic generating HST. A confir-
mation message from the HST on the far end appears on the
display of the near end HST informing you that the far end
HST is in loopback mode.
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