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+IPv4 Overlay Tunnels
+====================
+
+This section includes summary graphs of VPP Phy-to-Phy packet latency
+with IPv4 Overlay Tunnels measured at 50% of discovered NDR throughput
+rate. Latency is reported for VPP running in multiple configurations of
+VPP worker thread(s), a.k.a. VPP data plane thread(s), and their
+physical CPU core(s) placement.
+
+VPP packet latency in 1t1c setup (1thread, 1core) is presented in the graph below.
+
+.. raw:: html
+
+    <iframe width="700" height="1000" frameborder="0" scrolling="no" src="../../_static/vpp/64B-1t1c-ethip4-ndrdisc-lat50.html"></iframe>
+
+*Figure 1. VPP 1thread 1core - packet latency for Phy-to-Phy IPv4 Overlay Tunnels.*
+
+CSIT source code for the test cases used for above plots can be found in CSIT
+git repository:
+
+.. code-block:: bash
+
+    $ cd $CSIT/tests/vpp/perf/ip4_tunnels
+    $ grep -E "64B-1t1c-ethip4[a-z0-9]+-[a-z0-9]*-ndrdisc" *
+
+    10ge2p1x520-ethip4lispip4-ip4base-ndrdisc.robot:| tc01-64B-1t1c-ethip4lispip4-ip4base-ndrdisc
+    10ge2p1x520-ethip4lispip6-ip4base-ndrdisc.robot:| tc01-64B-1t1c-ethip4lispip6-ip4base-ndrdisc
+    10ge2p1x520-ethip4vxlan-l2bdbasemaclrn-ndrdisc.robot:| tc01-64B-1t1c-ethip4vxlan-l2bdbasemaclrn-ndrdisc
+    10ge2p1x520-ethip4vxlan-l2xcbase-ndrdisc.robot:| tc01-64B-1t1c-ethip4vxlan-l2xcbase-ndrdisc
+
+VPP packet latency in 2t2c setup (2thread, 2core) is presented in the graph below.
+
+.. raw:: html
+
+    <iframe width="700" height="1000" frameborder="0" scrolling="no" src="../../_static/vpp/64B-2t2c-ethip4-ndrdisc-lat50.html"></iframe>
+
+*Figure 2. VPP 2threads 2cores - packet latency for Phy-to-Phy IPv4 Overlay Tunnels.*
+
+CSIT source code for the test cases used for above plots can be found in CSIT
+git repository:
+
+.. code-block:: bash
+
+    $ cd $CSIT/tests/vpp/perf/ip4_tunnels
+    $ grep -E "64B-2t2c-ethip4[a-z0-9]+-[a-z0-9]*-ndrdisc" *
+
+    10ge2p1x520-ethip4lispip4-ip4base-ndrdisc.robot:| tc07-64B-2t2c-ethip4lispip4-ip4base-ndrdisc
+    10ge2p1x520-ethip4lispip6-ip4base-ndrdisc.robot:| tc07-64B-2t2c-ethip4lispip6-ip4base-ndrdisc
+    10ge2p1x520-ethip4vxlan-l2bdbasemaclrn-ndrdisc.robot:| tc07-64B-2t2c-ethip4vxlan-l2bdbasemaclrn-ndrdisc
+    10ge2p1x520-ethip4vxlan-l2xcbase-ndrdisc.robot:| tc07-64B-2t2c-ethip4vxlan-l2xcbase-ndrdisc
+