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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) OPNFV, Huawei Technologies Co.,Ltd and others.
+
+*************************************
+Yardstick Test Case Description TC043
+*************************************
+
+.. _cirros-image: https://download.cirros-cloud.net
+.. _Ping: https://linux.die.net/man/8/ping
+
++-----------------------------------------------------------------------------+
+|Network Latency Between NFVI Nodes |
+| |
++--------------+--------------------------------------------------------------+
+|test case id | OPNFV_YARDSTICK_TC043_LATENCY_BETWEEN_NFVI_NODES |
+| | |
++--------------+--------------------------------------------------------------+
+|metric | RTT (Round Trip Time) |
+| | |
++--------------+--------------------------------------------------------------+
+|test purpose | The purpose of TC043 is to do a basic verification that |
+| | network latency is within acceptable boundaries when packets |
+| | travel between different NFVI nodes. |
+| | |
+| | The purpose is also to be able to spot the trends. |
+| | Test results, graphs and similar shall be stored for |
+| | comparison reasons and product evolution understanding |
+| | between different OPNFV versions and/or configurations. |
+| | |
++--------------+--------------------------------------------------------------+
+|test tool | ping |
+| | |
+| | Ping is a computer network administration software utility |
+| | used to test the reachability of a host on an Internet |
+| | Protocol (IP) network. It measures the round-trip time for |
+| | packet sent from the originating host to a destination |
+| | computer that are echoed back to the source. |
+| | |
++--------------+--------------------------------------------------------------+
+|test topology | Ping packets (ICMP protocol's mandatory ECHO_REQUEST |
+| | datagram) are sent from host node to target node to elicit |
+| | ICMP ECHO_RESPONSE. |
+| | |
++--------------+--------------------------------------------------------------+
+|configuration | file: opnfv_yardstick_tc043.yaml |
+| | |
+| | Packet size 100 bytes. Total test duration 600 seconds. |
+| | One ping each 10 seconds. SLA RTT is set to maximum 10 ms. |
+| | |
++--------------+--------------------------------------------------------------+
+|applicability | This test case can be configured with different: |
+| | |
+| | * packet sizes; |
+| | * burst sizes; |
+| | * ping intervals; |
+| | * test durations; |
+| | * test iterations. |
+| | |
+| | Default values exist. |
+| | |
+| | SLA is optional. The SLA in this test case serves as an |
+| | example. Considerably lower RTT is expected, and also normal |
+| | to achieve in balanced L2 environments. However, to cover |
+| | most configurations, both bare metal and fully virtualized |
+| | ones, this value should be possible to achieve and |
+| | acceptable for black box testing. Many real time |
+| | applications start to suffer badly if the RTT time is higher |
+| | than this. Some may suffer bad also close to this RTT, while |
+| | others may not suffer at all. It is a compromise that may |
+| | have to be tuned for different configuration purposes. |
+| | |
++--------------+--------------------------------------------------------------+
+|references | Ping_ |
+| | |
+| | ETSI-NFV-TST001 |
+| | |
++--------------+--------------------------------------------------------------+
+|pre_test | Each pod node must have ping included in it. |
+|conditions | |
+| | |
++--------------+--------------------------------------------------------------+
+|test sequence | description and expected result |
+| | |
++--------------+--------------------------------------------------------------+
+|step 1 | Yardstick is connected with the NFVI node by using ssh. |
+| | 'ping_benchmark' bash script is copyied from Jump Host to |
+| | the NFVI node via the ssh tunnel. |
+| | |
++--------------+--------------------------------------------------------------+
+|step 2 | Ping is invoked. Ping packets are sent from server node to |
+| | client node. RTT results are calculated and checked against |
+| | the SLA. Logs are produced and stored. |
+| | |
+| | Result: Logs are stored. |
+| | |
++--------------+--------------------------------------------------------------+
+|test verdict | Test should not PASS if any RTT is above the optional SLA |
+| | value, or if there is a test case execution problem. |
+| | |
++--------------+--------------------------------------------------------------+