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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+.. (c) Huawei Technologies Co.,Ltd
+
+==================================================
+Forwarding Packets in Data Path test specification
+==================================================
+
+.. toctree::
+   :maxdepth: 2
+
+Scope
+=====
+
+This test area evaluates the ability of the system under test to support basic packet forwarding.
+The test in this test area will evaluate basic packet forwarding through virtual IPv4 networks
+in data path, including creating server and verifying network connectivity to the created server
+with ping operation using MTU sized packets.
+
+References
+==========
+
+N/A
+
+Definitions and abbreviations
+=============================
+
+The following terms and abbreviations are used in conjunction with this test
+area
+
+- API - Application Programming Interface
+- ICMP - Internet Control Message Protocol
+- MTU - Maximum Transmission Unit
+- NFVi - Network Functions Virtualization infrastructure
+- SSH - Secure Shell
+- VIM - Virtual Infrastructure Manager
+- VM - Virtual Machine
+
+System Under Test (SUT)
+=======================
+
+The system under test is assumed to be the NFVi and VIM in operation on a
+Pharos compliant infrastructure.
+
+Test Area Structure
+===================
+
+The test area is structured based on the basic operations of forwarding packets
+in data path through virtual networks. Specifically, the test performs
+clean-up operations which return the system to the same state as before the test.
+
+Test Descriptions
+=================
+
+API Used and Reference
+----------------------
+
+Security Groups: https://developer.openstack.org/api-ref/network/v2/index.html#security-groups-security-groups
+
+- create security group
+- delete security group
+
+Networks: https://developer.openstack.org/api-ref/networking/v2/index.html#networks
+
+- create network
+- delete network
+
+Routers and interface: https://developer.openstack.org/api-ref/networking/v2/index.html#routers-routers
+
+- create router
+- delete router
+- add interface to router
+
+Subnets: https://developer.openstack.org/api-ref/networking/v2/index.html#subnets
+
+- create subnet
+- delete subnet
+
+Servers: https://developer.openstack.org/api-ref/compute/
+
+- create keypair
+- create server
+- delete server
+- add/assign floating ip
+
+Ports: https://developer.openstack.org/api-ref/networking/v2/index.html#ports
+
+- create port
+- delete port
+
+Floating IPs: https://developer.openstack.org/api-ref/networking/v2/index.html#floating-ips-floatingips
+
+- create floating ip
+- delete floating ip
+
+----------------------------
+MTU Sized Frames Fit Through
+----------------------------
+
+Test case specification
+-----------------------
+
+tempest.scenario.test_network_basic_ops.TestNetworkBasicOps.test_mtu_sized_frames
+
+Test preconditions
+------------------
+
+* Nova has been configured to boot VMs with Neutron-managed networking
+* Neutron net-mtu extension API
+* One public network
+
+Basic test flow execution description and pass/fail criteria
+------------------------------------------------------------
+
+Test execution
+''''''''''''''
+
+* Test action 1: Create a security group SG1, which has rules for allowing
+  incoming and outgoing SSH and ICMP traffic
+* Test action 2: Create a neutron network NET1
+* Test action 3: Create a tenant router R1 which routes traffic to public network
+* Test action 4: Create a subnet SUBNET1 and add it as router interface
+* Test action 5: Create a server VM1 with SG1 and NET1, and assign a floating
+  ip FIP1 (via R1) to VM1
+* Test action 6: Set MTU size to be the default MTU size of the SUT's network
+* Test action 7: Host sends MTU sized ICMP packets to VM1 using ``ping``
+* **Test assertion 1:** Ping FIP1 using MTU sized packets successfully
+* Test action 8: SSH to VM1 with FIP1
+* **Test assertion 2:** SSH to VM1 with FIP1 successfully
+* Test action 9: Delete SG1, NET1, SUBNET1, R1, VM1 and FIP1
+
+Pass / fail criteria
+''''''''''''''''''''
+
+This test evaluates the network connectivity using MTU sized frames.
+Specifically, the test verifies that:
+
+* With Neutron net-mtu extension configured, MTU sized packets can fit through network.
+
+In order to pass this test, all test assertions listed in the test execution above need to pass.
+
+Post conditions
+---------------
+
+N/A