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User Guide
142
and analysis requires a loop-back device somewhere in the network to redirect the
traffic towards the origin (See section 2.2.3). It is also possible to generate traffic with
one tester and use a remote equipment to analyse this traffic but delay statistics will be
probably wrong or at least will have a poor accuracy due to the lack of a common timing
source for the generator and the analyser.
The test unit supports SLA tests both in bridged environments (Ethernet endpoint test
mode) and routed environments (IP endpoint test mode). Traffic generation in pass
through mode is not supported, for this reason, there are no SLA results in IP Through
mode.
The testers measure and represent up to eight sets of SLA statistics per test port for
each of the eight filter blocks. An important advise is that strictly, SLA results are
meaningful only for frames carrying the SLA payload. Other traffic accounted in the
same filter may be subject to different delay conditions. However, if one filter is
receiving mixed (SLA and not SLA) traffic, it is possible to guarantee the
representativeness of the SLA results if the correct filtering conditions are applied for
the traffic. For example if it is know that the DUT / SUT is applying different forwarding
policies depending only on the DSCP field, filters should be configured to use the
DSCP as a filtering rule.
SLA results are timed, you need to start a test with run to enable the equipment to
collect results. If you are using the equipment also as a test traffic generator you will
also need to start a test to enable traffic generation. Once the test is configured and
running you can access to the results. To configure and run an SLA test follow these
steps:
1. From the Home panel, go to RESULTS,
The test port results panel is displayed.
2. Select either Port A or Port B to enter in the port specific results.
3. Go to SLA statistics.
4. Select one of the filtering menus labelled as Filter A1, Filter A2, etc. (or Filter B1,
Filter B2, etc in Port B).
All the result menus related with the current filter are displayed.
5. Go to either Availability statistics or Delay statistics.
6. If you have chosen Availability statistics in the previous step then check the Lost
frames, FLR, SES, PEU (%), Out-of-sequence frames and Duplicated frames
results.If you have chosen Delay statistics in the previous step then check the
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