Include vTC overview in Yardstick documentation

This change includes the vTC overview in Yardstick configguide, the
original vTC/README has been renamed to 04-vTC-overview and added in the
configguide.

The vTC/abbreviations is deleted, all included in glossary.rst

Index and 03-list-of-tcs are updated.

JIRA:-

Change-Id: Ifc5cf1cc258dee6743af189f347e8adbbec6a32f
Signed-off-by: Ana C <ana.cunha@ericsson.com>

1 files changed, 114 insertions, 0 deletions

diff --git a/docs/configguide/yardstick_testcases/04-vtc-overview.rst b/docs/configguide/yardstick_testcases/04-vtc-overview.rst
new file mode 100644
index 000000000..95159a9bc
--- /dev/null
+++ b/docs/configguide/yardstick_testcases/04-vtc-overview.rst
@@ -0,0 +1,114 @@
+==========================
+Virtual Traffic Classifier
+==========================
+
+Abstract
+========
+
+.. _TNOVA: http://www.t-nova.eu/
+.. _TNOVAresults: http://www.t-nova.eu/results/
+.. _Yardstick: https://wiki.opnfv.org/yardstick
+
+This chapter provides an overview of the virtual Traffic Classifier, a
+contribution to OPNFV Yardstick_ from the EU Project TNOVA_.
+Additional documentation is available in TNOVAresults_.
+
+Overview
+========
+
+The virtual Traffic Classifier :term:`VNF`, the :term:`VTC`, comprises of a
+:term:`VNFC`. The :term:`VNFC` contains both the Traffic Inspection module, and
+the Traffic forwarding module, needed to run the VNF. The exploitation of
+:term:`DPI` methods for traffic classification is built around two basic
+assumptions:
+
+* third parties unaffiliated with either source or recipient are able to
+inspect each IP packet’s payload
+
+* the classifier knows the relevant syntax of each application’s packet
+payloads (protocol signatures, data patterns, etc.).
+
+The proposed :term:`DPI` based approach will only use an indicative, small
+number of the initial packets from each flow in order to identify the content
+and not inspect each packet.
+
+In this respect it follows the :term:`PBFS`. This method uses a table to track
+each session based on the 5-tuples (src address, dest address, src port,dest
+port, transport protocol) that is maintained for each flow.
+
+Concepts
+========
+
+* *Traffic Inspection*: The process of packet analysis and application
+identification of network traffic that passes through the :term:`VTC`.
+
+* *Traffic Forwarding*: The process of packet forwarding from an incoming
+network interface to a pre-defined outgoing network interface.
+
+* *Traffic Rule Application*: The process of packet tagging, based on a
+predefined set of rules. Packet tagging may include e.g. :term:`ToS` field
+modification.
+
+Architecture
+============
+
+The Traffic Inspection module is the most computationally intensive component
+of the :term:`VNF`. It implements filtering and packet matching algorithms in
+order to support the enhanced traffic forwarding capability of the :term:`VNF`.
+The component supports a flow table (exploiting hashing algorithms for fast
+indexing of flows) and an inspection engine for traffic classification.
+
+The implementation used for these experiments exploits the nDPI library.
+The packet capturing mechanism is implemented using libpcap. When the
+:term:`DPI` engine identifies a new flow, the flow register is updated with the
+appropriate information and transmitted across the Traffic Forwarding module,
+which then applies any required policy updates.
+
+The Traffic Forwarding moudle is responsible for routing and packet forwarding.
+It accepts incoming network traffic, consults the flow table for classification
+information for each incoming flow and then applies pre-defined policies
+marking e.g. :term:`ToS`/:term:`DSCP` multimedia traffic for :term:`QoS`
+enablement on the forwarded traffic.
+It is assumed that the traffic is forwarded using the default policy until it
+is identified and new policies are enforced.
+
+The expected response delay is considered to be negligible, as only a small
+number of packets are required to identify each flow.
+
+Graphical Overview
+==================
+
+.. code-block:: console
+
+  +----------------------------+
+  |                            |
+  | Virtual Traffic Classifier |
+  |                            |
+  |     Analysing/Forwarding   |
+  |        ------------>       |
+  |     ethA          ethB     |
+  |                            |
+  +----------------------------+
+       |              ^
+       |              |
+       v              |
+  +----------------------------+
+  |                            |
+  |     Virtual Switch         |
+  |                            |
+  +----------------------------+
+
+Install
+=======
+
+run the build.sh with root privileges
+
+Run
+===
+
+sudo ./pfbridge -a eth1 -b eth2
+
+Development Environment
+=======================
+
+Ubuntu 14.04