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-rw-r--r--docs/testing/user/configguide/trafficgen.rst12
1 files changed, 12 insertions, 0 deletions
diff --git a/docs/testing/user/configguide/trafficgen.rst b/docs/testing/user/configguide/trafficgen.rst
index 7c14c55d..2d2b9a9e 100644
--- a/docs/testing/user/configguide/trafficgen.rst
+++ b/docs/testing/user/configguide/trafficgen.rst
@@ -821,3 +821,15 @@ Default value of this parameter is defined in conf/03_traffic.conf as follows:
.. code-block:: console
TRAFFICGEN_TREX_RFC2544_TPUT_THRESHOLD = ''
+
+SR-IOV
+~~~~~~
+T-Rex by default only accepts packets on the receive side if the destination mac matches the
+MAC address specificed 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.
+
+.. code-block:: console
+
+ TRAFFICGEN_TREX_PROMISCUOUS=True