-- 3.0 GHz Intel Xeon Platinum processors with Intel Advanced Vector Extension
- 512 (AVX-512) instruction set.
-- Sustained all core Turbo frequency of up to 3.4GHz, and single core turbo
- frequency of up to 3.5 GHz.
-- Requires HVM AMIs that include drivers for ENA and NVMe [aws_ena]_.
-- Network bandwidth increases to up to 100 Gbps, delivering increased
- performance for network intensive applications.
-- Powered by the AWS Nitro System, a combination of dedicated hardware and
- lightweight hypervisor.
+- **3-Node Topology**: Consists of two EC2 instances acting as a Systems
+ Under Test (SUTs) and one EC2 instance acting as a Traffic Generator
+ (TG), with all instances connected into a ring topology. Used for
+ executing tests that require frame encapsulations not supported by TG
+ e.g. certain overlay tunnel encapsulations and IPsec.
+
+AWS EC2 Instances
+-----------------
+
+CSIT is using AWS EC2 C5n instances as System Under Test and TG virtual
+machines. C5n instances got selected to take advantage of high network
+throughput and packet rate performance. C5n instances offer up to 100
+Gbps network bandwidth and increased memory over comparable C5
+instances. For more information, see
+`Instance types <https://aws.amazon.com/ec2/instance-types/>`_.
+
+C5n features:
+
+- 3.0 GHz Intel Xeon Platinum (Skylake) processors with Intel AVX-512
+ instructions.
+- Sustained all core Turbo frequency of up to 3.4GHz, and single core
+ turbo frequency of up to 3.5 GHz.
+- Requires HVM AMIs (Amazon Machine Images) that include drivers for ENA
+ and NVMe. See :ref:`csit_ami` for more information.
+- Network bandwidth to up to 100 Gbps.
+- Powered by the AWS Nitro System, a combination of dedicated hardware
+ and lightweight hypervisor.