1 files changed, 50 insertions, 1 deletions
diff --git a/docs/report/introduction/physical_testbeds.rst b/docs/report/introduction/physical_testbeds.rst
index 9babb5fb1f..8860638d43 100644
--- a/docs/report/introduction/physical_testbeds.rst
+++ b/docs/report/introduction/physical_testbeds.rst
@@ -26,7 +26,8 @@ Two physical server topology types are used:
 Current FD.io production testbeds are built with SUT servers based on
 the following processor architectures:
 
-- Intel Xeon: Skylake Platinum 8180 and Haswell-SP E5-2699v3.
+- Intel Xeon: Skylake Platinum 8180, Haswell-SP E5-2699v3,
+  Cascadelake Platinum 8280, Cascadelake 6252N.
 - Intel Atom: Denverton C3858.
 - ARM: TaiShan 2280, hip07-d05.
 
@@ -40,6 +41,54 @@ https://git.fd.io/csit/tree/docs/lab/testbed_specifications.md.
 
 Following is the description of existing production testbeds.
 
+2-Node Xeon Cascadelake (2n-clx)
+--------------------------------
+
+Three 2n-clx testbeds are in operation in FD.io labs. Each 2n-clx testbed
+is built with two SuperMicro SYS-7049GP-TRT servers, SUTs are equipped with two
+Intel Xeon Gold 6252N processors (35.75 MB Cache, 2.30 GHz, 24 cores).
+TGs are equiped with Intel Xeon Cascadelake Platinum 8280 processors (38.5 MB
+Cache, 2.70 GHz, 28 cores). 2n-clx physical topology is shown below.
+
+.. only:: latex
+
+    .. raw:: latex
+
+        \begin{figure}[H]
+            \centering
+                \graphicspath{{../_tmp/src/introduction/}}
+                \includegraphics[width=0.90\textwidth]{testbed-2n-clx}
+                \label{fig:testbed-2n-clx}
+        \end{figure}
+
+.. only:: html
+
+    .. figure:: testbed-2n-clx.svg
+        :alt: testbed-2n-clx
+        :align: center
+
+SUT servers are populated with the following NIC models:
+
+#. NIC-1: x710-DA4 4p10GE Intel.
+#. NIC-2: xxv710-DA2 2p25GE Intel.
+#. NIC-3: mcx556a-edat ConnectX5 2p100GE Mellanox. (Only testbed t27, t28)
+#. NIC-4: empty, future expansion.
+#. NIC-5: empty, future expansion.
+#. NIC-6: empty, future expansion.
+
+TG servers run T-Rex application and are populated with the following
+NIC models:
+
+#. NIC-1: x710-DA4 4p10GE Intel.
+#. NIC-2: xxv710-DA2 2p25GE Intel.
+#. NIC-3: mcx556a-edat ConnectX5 2p100GE Mellanox. (Only testbed t27, t28)
+#. NIC-4: empty, future expansion.
+#. NIC-5: empty, future expansion.
+#. NIC-6: x710-DA4 4p10GE Intel. (For self-tests.)
+
+All Intel Xeon Cascadelake servers run with Intel Hyper-Threading enabled,
+doubling the number of logical cores exposed to Linux.
+
 2-Node Xeon Skylake (2n-skx)
 ----------------------------