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authorIsaku Yamahata <yamahata@valinux.co.jp>2013-02-15 09:45:44 +0900
committerFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2013-02-15 17:06:41 +0900
commitbe07508b43780218a4092e234eac004162394e35 (patch)
treedfa83de3be15a8bc09be7063073f001980566e56 /doc
parentc947e66fd1bd679199b238abf056828e7971c38b (diff)
doc: internal document on openstack cooperation
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Diffstat (limited to 'doc')
-rw-r--r--doc/source/how_l2_segregation_works.rst66
-rw-r--r--doc/source/images/assoc-ovs-port.pngbin75044 -> 0 bytes
-rw-r--r--doc/source/images/assoc-ovs-port.svg572
-rw-r--r--doc/source/images/filtering-broadcast.pngbin81194 -> 74318 bytes
-rw-r--r--doc/source/images/filtering-broadcast.svg53
-rw-r--r--doc/source/images/filtering-incoming.pngbin83554 -> 76553 bytes
-rw-r--r--doc/source/images/filtering-incoming.svg47
-rw-r--r--doc/source/images/filtering-outgoing.pngbin83163 -> 75718 bytes
-rw-r--r--doc/source/images/filtering-outgoing.svg53
-rw-r--r--doc/source/images/internal-gre-tunnel.pngbin0 -> 158758 bytes
-rw-r--r--doc/source/images/internal-gre-tunnel.svg1941
-rw-r--r--doc/source/images/internal-live-migration.pngbin0 -> 94345 bytes
-rw-r--r--doc/source/images/internal-live-migration.svg382
-rw-r--r--doc/source/images/internal-quantum-bootup.pngbin0 -> 102366 bytes
-rw-r--r--doc/source/images/internal-quantum-bootup.svg411
-rw-r--r--doc/source/images/internal-quantum-gre-flow-table.pngbin0 -> 61812 bytes
-rw-r--r--doc/source/images/internal-quantum-gre-flow-table.svg589
-rw-r--r--doc/source/images/internal-quantum-instance-create.pngbin0 -> 93682 bytes
-rw-r--r--doc/source/images/internal-quantum-instance-create.svg481
-rw-r--r--doc/source/images/internal-quantum-network-creation.pngbin0 -> 29947 bytes
-rw-r--r--doc/source/images/internal-quantum-network-creation.svg236
-rw-r--r--doc/source/images/internal-quantum-overview.pngbin0 -> 169547 bytes
-rw-r--r--doc/source/images/internal-quantum-overview.svg1813
-rw-r--r--doc/source/images/internal-tunnel-live-migration-after.pngbin0 -> 80570 bytes
-rw-r--r--doc/source/images/internal-tunnel-live-migration-after.svg1497
-rw-r--r--doc/source/images/internal-tunnel-live-migration-before.pngbin0 -> 84431 bytes
-rw-r--r--doc/source/images/internal-tunnel-live-migration-before.svg1445
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-rw-r--r--doc/source/images/internal-tunnel-live-migration-during.svg1578
-rw-r--r--doc/source/images/mac-learning.pngbin95849 -> 89003 bytes
-rw-r--r--doc/source/images/mac-learning.svg51
-rw-r--r--doc/source/images/network-creation.pngbin44004 -> 0 bytes
-rw-r--r--doc/source/images/network-creation.svg484
-rw-r--r--doc/source/internals_l2_isolation.rst193
-rw-r--r--doc/source/openstack.rst2
35 files changed, 10659 insertions, 1235 deletions
diff --git a/doc/source/how_l2_segregation_works.rst b/doc/source/how_l2_segregation_works.rst
deleted file mode 100644
index 4b0d2b9d..00000000
--- a/doc/source/how_l2_segregation_works.rst
+++ /dev/null
@@ -1,66 +0,0 @@
-.. _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
deleted file mode 100644
index 16e0386a..00000000
--- a/doc/source/images/assoc-ovs-port.png
+++ /dev/null
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diff --git a/doc/source/images/assoc-ovs-port.svg b/doc/source/images/assoc-ovs-port.svg
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+ sodipodi:arg1="1.0303768"
+ sodipodi:r2="40.97031"
+ sodipodi:r1="47.308437"
+ sodipodi:cy="545.31787"
+ sodipodi:cx="177.14105"
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+ id="path3797"
+ style="fill:#00ff00;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:0.99921262;stroke-linecap:butt;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;stroke-dashoffset:0"
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+ <text
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+ id="text3801"
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+ xml:space="preserve"><tspan
+ y="603.46344"
+ x="192.01549"
+ id="tspan3803"
+ sodipodi:role="line">OVS</tspan></text>
+ </g>
+ <path
+ sodipodi:type="arc"
+ style="fill:#00ffff;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:1.77165353;stroke-linecap:butt;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;stroke-dashoffset:0"
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+ transform="matrix(0.7468437,0,0,0.70094681,178.67835,126.04697)" />
+ <text
+ xml:space="preserve"
+ style="font-size:24px;font-style:normal;font-weight:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
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+ id="text3807"
+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
+ id="tspan3809"
+ x="399.21118"
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+ <path
+ style="fill:none;stroke:#000000;stroke-width:3.54330707;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;marker-end:url(#Arrow1Mend)"
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+ id="path3830"
+ inkscape:connector-curvature="0"
+ sodipodi:nodetypes="cc" />
+ <path
+ style="fill:none;stroke:#000000;stroke-width:3.54330707;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;marker-end:url(#Arrow1Mend)"
+ d="M 518.2067,442.54904 728.86992,219.25852"
+ id="path4462"
+ inkscape:connector-curvature="0"
+ sodipodi:nodetypes="cc" />
+ <path
+ style="fill:none;stroke:#000000;stroke-width:3.54330707;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;marker-end:url(#Arrow1Mend)"
+ d="m 521.02895,482.64718 78.74585,82.48553"
+ id="path4648"
+ inkscape:connector-curvature="0"
+ sodipodi:nodetypes="cc" />
+ <text
+ xml:space="preserve"
+ style="font-size:24px;font-style:normal;font-weight:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
+ x="81.932907"
+ y="517.38977"
+ id="text4834"
+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
+ id="tspan4836"
+ x="81.932907"
+ y="517.38977">1.get IP address</tspan><tspan
+ sodipodi:role="line"
+ x="81.932907"
+ y="547.38977"
+ id="tspan4404">for ryu to access</tspan><tspan
+ sodipodi:role="line"
+ x="81.932907"
+ y="577.38977"
+ id="tspan4406">ovsdb</tspan></text>
+ <text
+ xml:space="preserve"
+ style="font-size:24px;font-style:normal;font-weight:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
+ x="352.14709"
+ y="540.65802"
+ id="text4838"
+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
+ x="352.14709"
+ y="540.65802"
+ id="tspan4842">3. setup OVS</tspan><tspan
+ sodipodi:role="line"
+ x="352.14709"
+ y="570.65802"
+ id="tspan4200">to accept changes</tspan><tspan
+ sodipodi:role="line"
+ x="352.14709"
+ y="600.65802"
+ id="tspan4202">from Ryu.</tspan><tspan
+ sodipodi:role="line"
+ x="352.14709"
+ y="622.68402"
+ id="tspan4606"
+ style="font-size:16px">set-manager ptcp:&lt;port&gt;</tspan></text>
+ <text
+ xml:space="preserve"
+ style="font-size:24px;font-style:normal;font-weight:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
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+ y="216.63544"
+ id="text4846"
+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
+ x="387.24884"
+ y="216.63544"
+ id="tspan4850">4. register necesary infos</tspan><tspan
+ sodipodi:role="line"
+ x="387.24884"
+ y="246.63544"
+ id="tspan4854">dpid, ovsdb ip address</tspan><tspan
+ sodipodi:role="line"
+ x="387.24884"
+ y="276.63544"
+ id="tspan4177">(+ ip adress for tunnel</tspan><tspan
+ sodipodi:role="line"
+ x="387.24884"
+ y="306.63544"
+ id="tspan4616">if GRE is enabled)</tspan><tspan
+ sodipodi:role="line"
+ x="387.24884"
+ y="336.63544"
+ id="tspan4860" /></text>
+ <text
+ xml:space="preserve"
+ style="font-size:24px;font-style:normal;font-weight:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
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+ id="text4862"
+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
+ id="tspan4864"
+ x="22.987768"
+ y="50.404736"
+ style="font-size:48px">Node boot up</tspan></text>
+ <path
+ style="fill:none;stroke:#000000;stroke-width:3.29350114;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;marker-end:url(#Arrow1Mend)"
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+ id="path3027"
+ inkscape:connector-curvature="0"
+ sodipodi:nodetypes="cc" />
+ <text
+ xml:space="preserve"
+ style="font-size:24px;font-style:normal;font-weight:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
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+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
+ id="tspan4194"
+ x="51.824883"
+ y="268.15176">2. Get address</tspan><tspan
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+ x="51.824883"
+ y="298.15176"
+ id="tspan4198">for Ryu REST</tspan><tspan
+ sodipodi:role="line"
+ x="51.824883"
+ y="328.15176"
+ id="tspan4196">via openstack RPC</tspan><tspan
+ sodipodi:role="line"
+ x="51.824883"
+ y="358.15176"
+ id="tspan4618">which is used for</tspan><tspan
+ sodipodi:role="line"
+ x="51.824883"
+ y="388.15176"
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+ <rect
+ style="fill:none;stroke:#000000;stroke-width:0.78022003px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+ id="rect4204"
+ width="125.13995"
+ height="47.363235"
+ x="192.15517"
+ y="72.159836" />
+ <text
+ xml:space="preserve"
+ style="font-size:24px;font-style:normal;font-weight:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
+ x="213.64537"
+ y="101.04301"
+ id="text4206"
+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
+ id="tspan4208"
+ x="213.64537"
+ y="101.04301">ryu.ini</tspan></text>
+ <path
+ style="fill:none;stroke:#000000;stroke-width:3.54330707;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;marker-end:url(#Arrow1Mend)"
+ d="m 250.66315,119.02308 0,58.17077"
+ id="path4210"
+ inkscape:connector-curvature="0" />
+ <text
+ xml:space="preserve"
+ style="font-size:24px;font-style:normal;font-weight:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
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+ y="124.31133"
+ id="text4396"
+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
+ id="tspan4398"
+ x="11.634151"
+ y="124.31133">get IP address </tspan><tspan
+ sodipodi:role="line"
+ x="11.634151"
+ y="154.31133"
+ id="tspan4400">for Ryu REST API</tspan><tspan
+ sodipodi:role="line"
+ x="11.634151"
+ y="184.31133"
+ id="tspan4402">on startup</tspan></text>
+ <path
+ style="fill:none;stroke:#000000;stroke-width:3.54330707;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;marker-end:url(#Arrow1Mend)"
+ d="M 779.48837,217.38456 672.66568,570.63981"
+ id="path4408"
+ inkscape:connector-curvature="0"
+ sodipodi:nodetypes="cc" />
+ <text
+ xml:space="preserve"
+ style="font-size:24px;font-style:normal;font-weight:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
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+ id="text4594"
+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
+ x="767.85419"
+ y="286.13184"
+ id="tspan4598">5. setup ovs</tspan><tspan
+ sodipodi:role="line"
+ x="767.85419"
+ y="316.13184"
+ id="tspan4602">to connect Ryu</tspan><tspan
+ sodipodi:role="line"
+ x="767.85419"
+ y="346.13184"
+ id="tspan3045"
+ style="font-size:16px">set-controller tcp:&lt;ip&gt;:&lt;port&gt;</tspan></text>
+ </g>
+</svg>
diff --git a/doc/source/images/internal-quantum-gre-flow-table.png b/doc/source/images/internal-quantum-gre-flow-table.png
new file mode 100644
index 00000000..70007264
--- /dev/null
+++ b/doc/source/images/internal-quantum-gre-flow-table.png
Binary files differ
diff --git a/doc/source/images/internal-quantum-gre-flow-table.svg b/doc/source/images/internal-quantum-gre-flow-table.svg
new file mode 100644
index 00000000..53504c17
--- /dev/null
+++ b/doc/source/images/internal-quantum-gre-flow-table.svg
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+ <text
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+ <rect
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+ width="282.60529"
+ height="70.102013"
+ x="106.53268"
+ y="201.69412" />
+ <text
+ xml:space="preserve"
+ style="font-size:24px;font-style:normal;font-weight:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
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+ y="226.28462"
+ id="text3817"
+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
+ id="tspan3819"
+ x="120.8026"
+ y="226.28462">in_port</tspan><tspan
+ sodipodi:role="line"
+ x="120.8026"
+ y="256.28461"
+ id="tspan3821">src mac</tspan></text>
+ <text
+ xml:space="preserve"
+ style="font-size:24px;font-style:normal;font-weight:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
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+ y="228.48"
+ id="text3823"
+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
+ id="tspan3825"
+ x="236.0596"
+ y="228.48">set_tunnel</tspan><tspan
+ sodipodi:role="line"
+ x="236.0596"
+ y="258.47998"
+ id="tspan3827">goto table 1</tspan></text>
+ <rect
+ style="fill:#00ffff;fill-rule:evenodd;stroke:#000000;stroke-width:0.89289355px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+ id="rect3829"
+ width="279.90991"
+ height="35.005596"
+ x="106.53268"
+ y="299.23138" />
+ <text
+ xml:space="preserve"
+ style="font-size:24px;font-style:normal;font-weight:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
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+ y="321.66245"
+ id="text3831"
+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
+ id="tspan3833"
+ x="128.48639"
+ y="321.66245">in_port</tspan></text>
+ <text
+ xml:space="preserve"
+ style="font-size:24px;font-style:normal;font-weight:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
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+ id="text3835"
+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
+ id="tspan3837"
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+ width="283.56137"
+ height="72.447266"
+ x="107.63037"
+ y="394.23053" />
+ <text
+ xml:space="preserve"
+ style="font-size:24px;font-style:normal;font-weight:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
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+ y="421.67267"
+ id="text3841"
+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
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+ x="115.31416"
+ y="421.67267">in_port</tspan><tspan
+ sodipodi:role="line"
+ x="115.31416"
+ y="451.67267"
+ id="tspan3845">tunnel_id</tspan></text>
+ <text
+ xml:space="preserve"
+ style="font-size:24px;font-style:normal;font-weight:normal;line-height:125%;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;font-family:Bitstream Vera Sans"
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+ id="text3847"
+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
+ id="tspan3849"
+ x="235.36183"
+ y="431.71509">goto table 2</tspan></text>
+ <rect
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+ <text
+ xml:space="preserve"
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+ id="text3853"
+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
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+ y="226.61108">tunnel_id</tspan><tspan
+ sodipodi:role="line"
+ x="430.98666"
+ y="256.61108"
+ id="tspan3857">dst mac</tspan></text>
+ <text
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+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
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+ y="226.61107">output(tunnel)</tspan><tspan
+ sodipodi:role="line"
+ x="566.00195"
+ y="256.61105"
+ id="tspan3863">goto table 2</tspan></text>
+ <rect
+ style="fill:#00ffff;fill-rule:evenodd;stroke:#000000;stroke-width:0.74088061px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
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+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
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+ <text
+ xml:space="preserve"
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+ sodipodi:linespacing="125%"><tspan
+ sodipodi:role="line"
+ id="tspan3873"
+ x="573.68579"
+ y="326.50049">goto table 2</tspan></text>
+ <rect
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+ <text
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diff --git a/doc/source/internals_l2_isolation.rst b/doc/source/internals_l2_isolation.rst
new file mode 100644
index 00000000..03e2ad0e
--- /dev/null
+++ b/doc/source/internals_l2_isolation.rst
@@ -0,0 +1,193 @@
+.. _internals_l2_isolation:
+
+****************
+Ryu L2 isolation
+****************
+This section describes how Ryu cooperates with Openstack Quantum and
+how its L2 isolation works.
+
+Overview
+========
+Ryu provides REST API by which Quantum server tells necessary informations.
+Quantum Server manages the association networks(uuid) to actual key value in
+addition to normal Quantum management informations.
+(Here key value is an integer for VLAN ID, GRE key and so on.
+The quantum only have to know the range of key which depends on the isolation
+technology. For example, 12 bit in VLAN case, 24 bit in GRE case.)
+Quantum Ryu plugin doesn't know about what technology Ryu uses for L2
+isolation.
+
+ .. image:: /images/internal-quantum-overview.png
+
+Quantum doesn't necessarily knows all the informations Ryu needs like
+mac address attached to the interface. Ryu can gather those informations
+by accessing directly to OVSDB. When tunnel ports on OVS needs to be created
+on compute-node, Ryu will directly accesses to OVSDB and creates/deletes
+ports.
+
+
+Cooperate with Openstack Quantum
+================================
+Ryu reacts to Qauntnum events, compute-node boots up, network
+creation/deletion, and VM instance creation/deletion.
+When VM instance is created, corresponding quantum port is created.
+
+compute-node boot up
+--------------------
+When a compute note boots up, minimal initalization work is done by
+Ryu-quantum-agent which tell necessary informations to Ryu.
+Then Ryu set up OVS such that OVS connects to Ryu via OpenFlow.
+There are 2 steps of OVS initialization. By agent and by Ryu.
+This is to keep Ryu agent logic minimal and independent from what actual Ryu
+needs to set. Even if Ryu is enhanced for new feature and some additional
+configuration to OVS is needed (for example multi-controller for HA),
+ryu agent doesn't need to be modified due to 2 step initialization.
+
+ .. image:: /images/internal-quantum-bootup.png
+
+network creation
+----------------
+When network is created, quantum Ryu plugin assigns Key value to
+a created network, and tell the association to Ryu
+
+ .. image:: /images/internal-quantum-network-creation.png
+
+VM instance creation
+--------------------
+When VM instance is created, quantum port is created. Quantum Ryu
+plugin tells the association of (network uuid, port uuid) to Ryu, and
+then OVS port is created. Ryu finds the port creation via OpenFlow
+and get the information of the created port for (port uuid, attached
+mac address) via OVSDB protocoal, and then sets up network
+configuration to OVS.
+
+ .. image:: /images/internal-quantum-instance-create.png
+
+quantum_adapater RyuApp
+-----------------------
+This application watches port creation/deletion by OF protocol.
+When it detects the creation of ports, it tries to retrieve related
+informations(port uuid, mac address) by OVSDB protocol,
+tries to determine if the port corresponds to Qauntnum VM port, and then
+stores those informations into the in-memory, which generates the event of
+VMPort creation. Then Ryu app of isolation (simple_vlan or gre_tunnel)
+will be notified.
+
+live-migration
+--------------
+live-migration is popular feature with virtualization, so as OpenStack.
+As of this writing, there is no hooks in quantum. So no notification/callback
+are triggered when live-migration starts/on-going/ends/error-abort.
+Traditional live-migration uses GARP to tell switches the used mac address
+is moved.
+
+ .. image:: /images/internal-live-migration.png
+
+VLAN
+====
+OVS supports port vlan with setting tag value in OVSDB.
+Ryu utilizes it for L2 isolation.
+
+simple_vlan RyuApp
+------------------
+When port is created, it sets tag value to key assigned to a given network uuid.
+And sets flow entry to output:normal.
+
+live-migration
+--------------
+As flows includes output:normal action, packets are processed by
+OVS builtin mac-learning.
+
+#. When destination VM port is created, same rule is inserted on OVS
+ on the destination.
+ But the port on the destination is not used until the first GARP packet
+ is sent
+#. When VM is resumed on the destination, a GARP packet is sent.
+ Then, mac learning tables on each switch are updated.
+ So the port on the source will be unused.
+#. When the VM on the source is destroyed, the port on the source is also
+ destroyed.
+
+
+GRE tunneling
+=============
+OVS supports tunneling and Ryu utilizes it for L2 isolation as follows.
+
+ .. image:: /images/internal-gre-tunnel.png
+
+tunnel_port_updator RyuApp
+--------------------------
+This application watches the VM port creation/deletion, and creates/deletes
+tunnel port on OVS when necessary.
+That is, it creates tunnel port between compute-nodes which have VMs of same
+tenant. it deletes tunnel ports when compute-nodes have no VMs of same
+tenant.
+
+gre_tunnel RyuApp
+-----------------
+This application watches VM/tunnel port creation/deletion, and
+installs/removes flow entries based on port creation/deletion.
+
+Flow Entries
+------------
+Ryu installs following flow entries.
+
+ .. image:: /images/internal-quantum-gre-flow-table.png
+
+live-migration
+--------------
+As flows are aware of mac address of each ports, Ryu updates flow table
+for live-migration on each compute-nodes.
+When the port of same mac address is added on another compute-node,
+Ryu installs flows that duplicates packet so that packets destined to
+the mac address will be duplicated and sent to both ports.
+GARP from hypervisor isn't used.
+
+ .. image:: /images/internal-tunnel-live-migration-before.png
+ .. image:: /images/internal-tunnel-live-migration-during.png
+ .. image:: /images/internal-tunnel-live-migration-after.png
+
+Mac address based L2 isolation
+==============================
+Ryu also supports mac address based L2 isolation.
+In this case key isn't used.
+
+mac learing
+-----------
+When VM sends packets, Ryu determins network uuid from OVS port and then
+associates src mac address to network uuid.
+
+ .. 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 uuid 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 uuid 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 uuid 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 uuid.
+
+ * If yes, send the packet to the external ports except incoming one
+ and the all OVS ports that belongs to the network uuid
+ * if no, drop the packet.
+
+ .. image:: /images/filtering-broadcast.png
+
+live-migration
+--------------
+As of this writing, simple isolation doesn't support live-migration.
diff --git a/doc/source/openstack.rst b/doc/source/openstack.rst
index ec1b9b19..e0b9f571 100644
--- a/doc/source/openstack.rst
+++ b/doc/source/openstack.rst
@@ -9,4 +9,4 @@ Ryu provides tenant isolation feature in OpenStack.
using_with_openstack.rst
step_by_step.rst
- how_l2_segregation_works.rst
+ internals_l2_isolation.rst