initial commit

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

32 files changed, 11469 insertions, 0 deletions

diff --git a/doc/Makefile b/doc/Makefile
new file mode 100644
index 00000000..2fe1f88f
--- /dev/null
+++ b/doc/Makefile
@@ -0,0 +1,130 @@
+# Makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line.
+SPHINXOPTS    =
+SPHINXBUILD   = sphinx-build
+PAPER         =
+BUILDDIR      = build
+
+# Internal variables.
+PAPEROPT_a4     = -D latex_paper_size=a4
+PAPEROPT_letter = -D latex_paper_size=letter
+ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) source
+
+.PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest
+
+help:
+	@echo "Please use \`make <target>' where <target> is one of"
+	@echo "  html       to make standalone HTML files"
+	@echo "  dirhtml    to make HTML files named index.html in directories"
+	@echo "  singlehtml to make a single large HTML file"
+	@echo "  pickle     to make pickle files"
+	@echo "  json       to make JSON files"
+	@echo "  htmlhelp   to make HTML files and a HTML help project"
+	@echo "  qthelp     to make HTML files and a qthelp project"
+	@echo "  devhelp    to make HTML files and a Devhelp project"
+	@echo "  epub       to make an epub"
+	@echo "  latex      to make LaTeX files, you can set PAPER=a4 or PAPER=letter"
+	@echo "  latexpdf   to make LaTeX files and run them through pdflatex"
+	@echo "  text       to make text files"
+	@echo "  man        to make manual pages"
+	@echo "  changes    to make an overview of all changed/added/deprecated items"
+	@echo "  linkcheck  to check all external links for integrity"
+	@echo "  doctest    to run all doctests embedded in the documentation (if enabled)"
+
+clean:
+	-rm -rf $(BUILDDIR)/*
+
+html:
+	$(SPHINXBUILD) -b html $(ALLSPHINXOPTS) $(BUILDDIR)/html
+	@echo
+	@echo "Build finished. The HTML pages are in $(BUILDDIR)/html."
+
+dirhtml:
+	$(SPHINXBUILD) -b dirhtml $(ALLSPHINXOPTS) $(BUILDDIR)/dirhtml
+	@echo
+	@echo "Build finished. The HTML pages are in $(BUILDDIR)/dirhtml."
+
+singlehtml:
+	$(SPHINXBUILD) -b singlehtml $(ALLSPHINXOPTS) $(BUILDDIR)/singlehtml
+	@echo
+	@echo "Build finished. The HTML page is in $(BUILDDIR)/singlehtml."
+
+pickle:
+	$(SPHINXBUILD) -b pickle $(ALLSPHINXOPTS) $(BUILDDIR)/pickle
+	@echo
+	@echo "Build finished; now you can process the pickle files."
+
+json:
+	$(SPHINXBUILD) -b json $(ALLSPHINXOPTS) $(BUILDDIR)/json
+	@echo
+	@echo "Build finished; now you can process the JSON files."
+
+htmlhelp:
+	$(SPHINXBUILD) -b htmlhelp $(ALLSPHINXOPTS) $(BUILDDIR)/htmlhelp
+	@echo
+	@echo "Build finished; now you can run HTML Help Workshop with the" \
+	      ".hhp project file in $(BUILDDIR)/htmlhelp."
+
+qthelp:
+	$(SPHINXBUILD) -b qthelp $(ALLSPHINXOPTS) $(BUILDDIR)/qthelp
+	@echo
+	@echo "Build finished; now you can run "qcollectiongenerator" with the" \
+	      ".qhcp project file in $(BUILDDIR)/qthelp, like this:"
+	@echo "# qcollectiongenerator $(BUILDDIR)/qthelp/ryu.qhcp"
+	@echo "To view the help file:"
+	@echo "# assistant -collectionFile $(BUILDDIR)/qthelp/ryu.qhc"
+
+devhelp:
+	$(SPHINXBUILD) -b devhelp $(ALLSPHINXOPTS) $(BUILDDIR)/devhelp
+	@echo
+	@echo "Build finished."
+	@echo "To view the help file:"
+	@echo "# mkdir -p $$HOME/.local/share/devhelp/ryu"
+	@echo "# ln -s $(BUILDDIR)/devhelp $$HOME/.local/share/devhelp/ryu"
+	@echo "# devhelp"
+
+epub:
+	$(SPHINXBUILD) -b epub $(ALLSPHINXOPTS) $(BUILDDIR)/epub
+	@echo
+	@echo "Build finished. The epub file is in $(BUILDDIR)/epub."
+
+latex:
+	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
+	@echo
+	@echo "Build finished; the LaTeX files are in $(BUILDDIR)/latex."
+	@echo "Run \`make' in that directory to run these through (pdf)latex" \
+	      "(use \`make latexpdf' here to do that automatically)."
+
+latexpdf:
+	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
+	@echo "Running LaTeX files through pdflatex..."
+	$(MAKE) -C $(BUILDDIR)/latex all-pdf
+	@echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex."
+
+text:
+	$(SPHINXBUILD) -b text $(ALLSPHINXOPTS) $(BUILDDIR)/text
+	@echo
+	@echo "Build finished. The text files are in $(BUILDDIR)/text."
+
+man:
+	$(SPHINXBUILD) -b man $(ALLSPHINXOPTS) $(BUILDDIR)/man
+	@echo
+	@echo "Build finished. The manual pages are in $(BUILDDIR)/man."
+
+changes:
+	$(SPHINXBUILD) -b changes $(ALLSPHINXOPTS) $(BUILDDIR)/changes
+	@echo
+	@echo "The overview file is in $(BUILDDIR)/changes."
+
+linkcheck:
+	$(SPHINXBUILD) -b linkcheck $(ALLSPHINXOPTS) $(BUILDDIR)/linkcheck
+	@echo
+	@echo "Link check complete; look for any errors in the above output " \
+	      "or in $(BUILDDIR)/linkcheck/output.txt."
+
+doctest:
+	$(SPHINXBUILD) -b doctest $(ALLSPHINXOPTS) $(BUILDDIR)/doctest
+	@echo "Testing of doctests in the sources finished, look at the " \
+	      "results in $(BUILDDIR)/doctest/output.txt."
diff --git a/doc/source/_static/.placeholder b/doc/source/_static/.placeholder
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/doc/source/_static/.placeholder
diff --git a/doc/source/_templates/.placeholder b/doc/source/_templates/.placeholder
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/doc/source/_templates/.placeholder
diff --git a/doc/source/conf.py b/doc/source/conf.py
new file mode 100644
index 00000000..ed247019
--- /dev/null
+++ b/doc/source/conf.py
@@ -0,0 +1,216 @@
+# -*- coding: utf-8 -*-
+#
+# ryu documentation build configuration file, created by
+# sphinx-quickstart on Mon Dec  5 15:38:48 2011.
+#
+# This file is execfile()d with the current directory set to its containing dir.
+#
+# Note that not all possible configuration values are present in this
+# autogenerated file.
+#
+# All configuration values have a default; values that are commented out
+# serve to show the default.
+
+import sys, os
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#sys.path.insert(0, os.path.abspath('.'))
+
+# -- General configuration -----------------------------------------------------
+
+# If your documentation needs a minimal Sphinx version, state it here.
+#needs_sphinx = '1.0'
+
+# Add any Sphinx extension module names here, as strings. They can be extensions
+# coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
+extensions = []
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix of source filenames.
+source_suffix = '.rst'
+
+# The encoding of source files.
+#source_encoding = 'utf-8-sig'
+
+# The master toctree document.
+master_doc = 'index'
+
+# General information about the project.
+project = u'ryu'
+copyright = u'2011, ryu development team'
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The short X.Y version.
+version = '0.1'
+# The full version, including alpha/beta/rc tags.
+release = '0.1'
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#language = None
+
+# There are two options for replacing |today|: either, you set today to some
+# non-false value, then it is used:
+#today = ''
+# Else, today_fmt is used as the format for a strftime call.
+#today_fmt = '%B %d, %Y'
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+exclude_patterns = []
+
+# The reST default role (used for this markup: `text`) to use for all documents.
+#default_role = None
+
+# If true, '()' will be appended to :func: etc. cross-reference text.
+#add_function_parentheses = True
+
+# If true, the current module name will be prepended to all description
+# unit titles (such as .. function::).
+#add_module_names = True
+
+# If true, sectionauthor and moduleauthor directives will be shown in the
+# output. They are ignored by default.
+#show_authors = False
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = 'sphinx'
+
+# A list of ignored prefixes for module index sorting.
+#modindex_common_prefix = []
+
+
+# -- Options for HTML output ---------------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+html_theme = 'default'
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+#html_theme_options = {}
+
+# Add any paths that contain custom themes here, relative to this directory.
+#html_theme_path = []
+
+# The name for this set of Sphinx documents.  If None, it defaults to
+# "<project> v<release> documentation".
+#html_title = None
+
+# A shorter title for the navigation bar.  Default is the same as html_title.
+#html_short_title = None
+
+# The name of an image file (relative to this directory) to place at the top
+# of the sidebar.
+#html_logo = None
+
+# The name of an image file (within the static path) to use as favicon of the
+# docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
+# pixels large.
+#html_favicon = None
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']
+
+# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
+# using the given strftime format.
+#html_last_updated_fmt = '%b %d, %Y'
+
+# If true, SmartyPants will be used to convert quotes and dashes to
+# typographically correct entities.
+#html_use_smartypants = True
+
+# Custom sidebar templates, maps document names to template names.
+#html_sidebars = {}
+
+# Additional templates that should be rendered to pages, maps page names to
+# template names.
+#html_additional_pages = {}
+
+# If false, no module index is generated.
+#html_domain_indices = True
+
+# If false, no index is generated.
+#html_use_index = True
+
+# If true, the index is split into individual pages for each letter.
+#html_split_index = False
+
+# If true, links to the reST sources are added to the pages.
+#html_show_sourcelink = True
+
+# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
+#html_show_sphinx = True
+
+# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
+#html_show_copyright = True
+
+# If true, an OpenSearch description file will be output, and all pages will
+# contain a <link> tag referring to it.  The value of this option must be the
+# base URL from which the finished HTML is served.
+#html_use_opensearch = ''
+
+# This is the file name suffix for HTML files (e.g. ".xhtml").
+#html_file_suffix = None
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = 'ryudoc'
+
+
+# -- Options for LaTeX output --------------------------------------------------
+
+# The paper size ('letter' or 'a4').
+#latex_paper_size = 'letter'
+
+# The font size ('10pt', '11pt' or '12pt').
+#latex_font_size = '10pt'
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title, author, documentclass [howto/manual]).
+latex_documents = [
+  ('index', 'ryu.tex', u'ryu Documentation',
+   u'ryu development team', 'manual'),
+]
+
+# The name of an image file (relative to this directory) to place at the top of
+# the title page.
+#latex_logo = None
+
+# For "manual" documents, if this is true, then toplevel headings are parts,
+# not chapters.
+#latex_use_parts = False
+
+# If true, show page references after internal links.
+#latex_show_pagerefs = False
+
+# If true, show URL addresses after external links.
+#latex_show_urls = False
+
+# Additional stuff for the LaTeX preamble.
+#latex_preamble = ''
+
+# Documents to append as an appendix to all manuals.
+#latex_appendices = []
+
+# If false, no module index is generated.
+#latex_domain_indices = True
+
+
+# -- Options for manual page output --------------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+    ('index', 'ryu', u'ryu Documentation',
+     [u'ryu development team'], 1)
+]
diff --git a/doc/source/getting_started.rst b/doc/source/getting_started.rst
new file mode 100644
index 00000000..bfc108ec
--- /dev/null
+++ b/doc/source/getting_started.rst
@@ -0,0 +1,43 @@
+.. _getting_started:
+
+***************
+Getting Started
+***************
+
+Overview/What's Ryu the Network OS
+==================================
+Ryu is an open-sourced Network OS which is licensed under GPL v3.
+It supports openflow protocol.
+
+If you are not familiar with Software Defined Network(SDN) and
+OpenFlow/openflow controller,
+please refer to `openflow org <http://www.openflow.org/>`_ .
+
+The mailing list is available at
+`ryu-devel ML <https://lists.sourceforge.net/lists/listinfo/ryu-devel>`_
+
+
+Installing Ryu Network OS
+=========================
+Extract source code and just type::
+
+   % python ./setup.py install
+
+Then, run ryu-manager.
+It listens to ip address 0.0.0.0 and port 6633 by default.
+Then have your openflow switch (hardware or openvswitch OVS) to connect to
+ryu-manager.
+
+For OVS case, you can done it by
+
+  % ovs-vsctl set-controller <your bridge>  tcp:<ip addr>[:<port: default 6633>]
+
+At the moment, ryu-manager supports only tcp method.
+If you want to use it with openstack nova and quantum OVS plugin,
+Please refer to :ref:`using_with_openstack`.
+
+Configuration
+=============
+It can be configured by passing configuration file like::
+
+  ryu-manager [--flagfile <path to configuration file>]
diff --git a/doc/source/how_l2_segregation_works.rst b/doc/source/how_l2_segregation_works.rst
new file mode 100644
index 00000000..4b0d2b9d
--- /dev/null
+++ b/doc/source/how_l2_segregation_works.rst
@@ -0,0 +1,66 @@
+.. _how_it_works:
+
+****************************
+How Ryu L2 segregation works
+****************************
+This section describes how Ryu L2 segregation works.
+
+tenant/network id creation
+==========================
+When tenant(= network id) is created, Quantum server tells it to Ryu.
+Ryu remembers the network id.
+
+  .. image:: /images/network-creation.png
+
+
+association OVS port to network id
+==================================
+#. When VM instance is created, the network port is created in OVS and
+   it is associated to network id that VM belongs to.
+
+#. quantum OVS agent tells the associated (network id, ovs port) to Ryu.
+   Ryu remembers (network id, ovs port) relationship.
+
+#. quantum OVS agent also tells to Ryu which OVS port is not managed by
+   nova/quantum, but is connected to external ether cable.
+   We call it external OVS port or that the port is external.
+
+
+  .. image:: /images/assoc-ovs-port.png
+
+
+mac learing
+===========
+When VM sends packets, Ryu determins network id from OVS port and then
+associates src mac address to network id.
+
+   .. image:: /images/mac-learning.png
+
+
+packet filtering(L2 unicast case)
+=================================
+* When VM sending L2-unicast packet, Ryu checks if the destination mac
+  address belongs to the same netowrk id of the source mac address which
+  is same to the network id that the OVS port is associated to.
+* If no, the packet is dropped.
+* If yes, send the packet is sent to ports which belongs to the same
+  network id and external port.
+
+   .. image:: /images/filtering-outgoing.png
+   .. image:: /images/filtering-incoming.png
+
+
+packet filtering(L2 broadcast case)
+===================================
+* When VM sending L2-broadcast/multicaset packet, Ryu checks if the source
+  mac address.
+* send the packet to all external ports and all OVS ports that belongs
+  to the same network id of the source mac address.
+* When receiving broacast/multicast packet from the external ports,
+  Ryu checks if the source mac address belongs to known network id.
+
+   * If yes, send the packet to the external ports except incoming one
+     and the all OVS ports that belongs to the network id
+   * if no, drop the packet.
+
+   .. image:: /images/filtering-broadcast.png
diff --git a/doc/source/images/assoc-ovs-port.png b/doc/source/images/assoc-ovs-port.png
new file mode 100644
index 00000000..16e0386a
--- /dev/null
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diff --git a/doc/source/images/assoc-ovs-port.svg b/doc/source/images/assoc-ovs-port.svg
new file mode 100644
index 00000000..2aa8656e
--- /dev/null
+++ b/doc/source/images/assoc-ovs-port.svg
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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
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+   sodipodi:docname="assoc-ovs-port.svg"
+   inkscape:export-filename="/home/yamahata/openvswitch/sp-lab/scarab/scarab-2/doc/source/images/assoc-ovs-port.png"
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+     inkscape:window-height="1004"
+     inkscape:window-x="50"
+     inkscape:window-y="3"
+     inkscape:window-maximized="0"
+     inkscape:snap-grids="true"
+     inkscape:snap-to-guides="false"
+     inkscape:snap-bbox="false"
+     inkscape:snap-page="false"
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diff --git a/doc/source/index.rst b/doc/source/index.rst
new file mode 100644
index 00000000..2320e219
--- /dev/null
+++ b/doc/source/index.rst
@@ -0,0 +1,26 @@
+.. ryu documentation master file, created by
+   sphinx-quickstart on Mon Dec  5 15:38:48 2011.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+**********************************
+Welcome to RYU the Network OS(NOS)
+**********************************
+
+Contents:
+
+.. toctree::
+   :maxdepth: 2
+
+   overview.rst
+   getting_started.rst
+   using_with_openstack.rst
+   how_l2_segregation_works.rst
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`
+
diff --git a/doc/source/overview.rst b/doc/source/overview.rst
new file mode 100644
index 00000000..a6210d3d
--- /dev/null
+++ b/doc/source/overview.rst
@@ -0,0 +1 @@
+.. include:: ../../README.rst
diff --git a/doc/source/using_with_openstack.rst b/doc/source/using_with_openstack.rst
new file mode 100644
index 00000000..143a3042
--- /dev/null
+++ b/doc/source/using_with_openstack.rst
@@ -0,0 +1,251 @@
+.. _using_with_openstack:
+
+***************************************************************
+Using Ryu Network OS with with OpenStack as OpenFlow controller
+***************************************************************
+This section describes how to setup openstack (nova, quantum) and
+ryu-manager.
+It is assumed that kvm with libvirt is used and each host machines that run
+nova-compute/nova-network has two physical NICs.
+It would be possible to deploy it with single NIC machines as described at
+the last section.
+
+NOTE: How to use nova isn't described in this document.
+
+Overview
+========
+
+Ryu is designed/implemented with for production use in mind, so it cooperates
+very well with `OpenStack <http://www.openstack.org/>`_ .
+With nova and quantum OVS plugin,
+Ryu provides L2 segregation of Multi-tenants without any switch feature/settings
+like VLAN. So it's very easy to use/experiment/deploy this segregation as 
+the below figure.
+
+    .. image:: /images/logical-view.png
+
+
+
+Physical machine setup
+----------------------
+The following figure depicts how physical hosts are connected and each daemons
+are deployed.
+
+    .. image:: /images/physical-view.png
+
+Although the nova-api, nova-scheduler, nova-network and related openstack
+daemons are installed in each own physical machines in the above picture,
+they can be installed on a physical machine which also runs nova-compute.
+Each host machine has two nics and one is connected to management LAN
+and other is connected to deployment LAN.
+
+
+How to install/setup
+====================
+If you are not familiar with installing/setting up nova/quantum/openvswitch
+from the source, please refer to OpenStack document and get back here again.
+[
+`OpenStack docs <http://docs.openstack.org/>`_ ,
+`Nova <http://www.openstack.org/projects/compute/>`_ ,
+`Quantum <http://docs.openstack.org/incubation/>`_ ,
+`OpenvSwtich and Quantum Part 1 <http://openvswitch.org/openstack/2011/07/25/openstack-quantum-and-open-vswitch-part-1/>`_ ,
+`OpenvSwtich and Quantum Part 2 <http://openvswitch.org/openstack/2011/07/25/openstack-quantum-and-open-vswitch-part-1/>`_ ,
+`OVS Quantum Plugin Documentation <http://openvswitch.org/openstack/documentation/>`_
+]
+
+* Install ryu and run ryu-manager
+   * install ryu from the source code on the hosts on which you run
+       * nova-compute,
+       * quantum-server and
+       * ryu-manager.
+
+     This is because quantum-server and ova quantum agent which runs on
+     nova-compute node needs ryu-client library to communicate ryu-manager.
+
+     Type in ryu source directory::
+
+     % python ./setup.py install
+
+   * edit /etc/ryu/ryu.conf on the host on which you run ryu-manager
+     if necessary
+
+     No configuration is needed on hosts that runs quantum and ovs quantum
+     agent.
+
+   * run ryu network os::
+
+      % ryu-manager [----flagfile /etc/ryu/ryu.conf]
+
+
+* get nova source and quantum source from github
+   * They are a bit modified from openstack master tree. They are available
+     at github for convinience
+
+      * https://github.com/osrg/nova/tree/ryu
+      * https://github.com/osrg/quantum/tree/ryu
+
+     clone them by typing the followings in an appropriate directory::
+
+      % git clone --branch ryu git://github.com/osrg/nova.git
+      % git clone --branch ryu git://github.com/osrg/quantum.git
+
+     If you prefer https, try those::
+
+      % git clone --branch ryu https://github.com/osrg/nova.git
+      % git clone --branch ryu https://github.com/osrg/quantum.git
+
+
+* Install nova and quantum as usual.
+  (And other Openstack related component if necessary. e.g. glance)
+
+  Each daemons can be installed in a single machine or in different machines.
+  Please refer to Openstack documentation for details.
+  You may want to set up multiple nova-compute nodes for interesting use case.
+
+* Setup nova daemons. (Edit nova.conf)
+  Specifically configure nova-network and nova-compute
+
+    * configure nova-network
+       * --fixed_ranges=<setup here>
+       * --network_size=<setup here>
+       * --network_manager=nova.network.quantum.manager.QuantumManage
+       * --quantum_connection_host=<quantume server ip address>
+       * --firewall_driver=nova.virt.libvirt.firewall.NopFirewallDriver
+
+        NOP firewall driver is newly introduced for demonstrating Ryu
+        capability.
+        If you want, other existing firewall driver can be specified.
+        But such specification don't have any effect in fact
+        because ryu directly controls packets to VM instance via OVS bypassing
+        netfilter/iptables.
+
+       * --linuxnet_interface_driver=nova.network.linux_net.LinuxOVSOFInterfaceDriver
+    * set up OVS on each nova-compute node
+
+      If Ubuntu is used, you can install it from packages as
+      openvswitch-datapath-dkms, openvswitch-common, openvswitch-switch
+      If you already use bridge, you may need to edit /etc/modules to load
+      openvswitch kernel module, openvswitch_mod and brcompat_mod,  before
+      bridge module and reboot to unload bridge module.
+
+     And then create ovs bridge::
+  
+     # ovs-vsctl add-br <bridge name: usually br-int>
+
+     And if you connect NIC to OVS bridge.::
+
+     # ovs-vsctl add-port <bridge name:br-int> <ether interface: e.g. eth<N>>
+
+    * configure each nova-compute
+       * --libvirt_type=kvm
+       * --libvirt_ovs_integration_bridge=<OVS bridge:br-int>
+       * --libvirt_vif_type=ethernet
+       * --libvirt_vif_driver=nova.virt.libvirt.vif.LibvirtOpenVswitchDriver
+
+* install quantum server and have quantum to use OVS pluging
+   * Edit [PLUGIN] section of /etc/quantum/plugins.ini
+      * provider = quantum.plugins.openvswitch.ovs_quantum_plugin.OVSQuantumPlugin
+
+   * Edit [OVS] section of
+     /etc/quantum/plugins/openvswitch/ovs_quantum_plugin.ini
+     
+     In addition to normal quantum OVS settings, add the followings.
+      * integration-bridge = <OVS bridge name: br-int>
+      * plugin_driver = quantum.plugins.openvswitch.ovs_quantum_plugin.OFPRyuDriver
+      * agent_driver = OVSQuantumOFPRyuAgent
+      * openflow-controller = <ryu-manager IP address>:<ryu openflow port: default 6633>
+      * openflow-rest-api = <ryu-manager IP address>:<RYU reset API port: default 8080>
+
+   * Run quantum server
+* install quantum OVS agent on each nova-compute node
+   * Edit /etc/quantum/plugins/openvswitch/ovs_quantum_plugin.ini
+   * Run ovs agent::
+
+     # ovs_quantum_agent.py -v ./etc/quantum/plugins/openvswitch/ovs_quantum_plugin.ini
+
+* Then as usual openstack nova operation, create user, project, network and
+  run instances.
+* Enjoy!
+
+
+Testing
+=======
+Yay, now you have ryu network OS set up.
+You would want to really they are L2-segregated.
+
+* create multi projects and run instances.
+* ping/traceroute between them.
+* tcpdump in the instances
+
+The routing between gateway(gw-xxx) of each tenants are disabled
+by nova.network.linux_net.LinuxOVSOFInterfaceDriver by installing iptables
+rule on nova-network host::
+
+  # iptable -t filter -A nova-network-FORWARD --in-interface gw-+ --out-interface gw-+
+
+Thus pinging/tracerouting between VMs in distinct tenants doesn't work.
+If you drop the above rule by::
+
+  # iptable -t filter -D nova-network-FORWARD --in-interface gw-+ --out-interface gw-+
+
+You will see ping/tracerout works. Please notice that the packets go through
+gw-xxx and gw-yyy, not directly.
+
+   .. image:: /images/trace-route.png
+
+
+Caveats
+=======
+* Run the following daemons in this order
+   #. Run Ryu network OS
+   #. Run quantum with OVS plugin
+   #. Run quantum OVS agent
+   #. run your guest instance
+
+   For now, ryu-manager doesn't have persistent store, so if it's rebooted,
+   all the necessary information must be told again from quantum server/agent.
+
+* nova-manage network delete doesn't work
+
+  At this moment, quantum doesn't implement network delete fully yet.
+  If you issue the command, it fails. And you need to fix nova/quantum DB 
+  by hand using SQL.
+
+
+Appendix
+========
+In the above, two physical NIC deployment is described.
+Some people may want to use those settings with single NIC machine or even
+with single machine.
+It would be possible as the following pictures, but we haven't tested those
+setting. If you success it, please report it.
+
+single NIC/All-in-One setting
+-----------------------------
+If your host machines have only single NIC, it would be possible to use
+Ryu network OS with Linux bridge. However we haven't tested such setups.
+
+    .. image:: /images/compute-node.png
+
+
+All-in-One Setup
+----------------
+You can also setup in single physical host as the following picture.
+
+    .. image:: /images/minimul-setup.png
+
+You can setup the above environment quickly using DevStack.
+
+  #. Install Ubuntu 11.10 (Oneiric)
+
+  #. Download Ryu enabled DevStack from github
+     ::
+
+     % git clone --branch ryu git://github.com/osrg/devstack.git
+
+  #. Start the install
+     ::
+
+     % cd devstack; ./stack.sh
+
+     It will take a few minutes.