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-rw-r--r--docs/testing/user/configguide/trafficgen.rst7
1 files changed, 5 insertions, 2 deletions
diff --git a/docs/testing/user/configguide/trafficgen.rst b/docs/testing/user/configguide/trafficgen.rst
index 597f566b..4b9eec6e 100644
--- a/docs/testing/user/configguide/trafficgen.rst
+++ b/docs/testing/user/configguide/trafficgen.rst
@@ -826,14 +826,17 @@ Default value of this parameter is defined in conf/03_traffic.conf as follows:
TRAFFICGEN_TREX_RFC2544_TPUT_THRESHOLD = ''
-SR-IOV
-~~~~~~
+SR-IOV and Multistream layer 2
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
T-Rex by default only accepts packets on the receive side if the destination mac matches the
MAC address specified in the /etc/trex-cfg.yaml on the server side. For SR-IOV this creates
challenges with modifying the MAC address in the traffic profile to correctly flow packets
through specified VFs. To remove this limitation enable promiscuous mode on T-Rex to allow
all packets regardless of the destination mac to be accepted.
+This also creates problems when doing multistream at layer 2 since the source macs will be
+modified. Enable Promiscuous mode when doing multistream at layer 2 testing with T-Rex.
+
.. code-block:: console
TRAFFICGEN_TREX_PROMISCUOUS=True