Update 2.0 doc

Change-Id: I223bd40e798c772d7cf7423d88f62bccb164a46b
Signed-off-by: ahothan <ahothan@cisco.com>

6 files changed, 84 insertions, 49 deletions

diff --git a/docs/testing/user/userguide/advanced.rst b/docs/testing/user/userguide/advanced.rst
index 02c7fce..1d2ac36 100644
--- a/docs/testing/user/userguide/advanced.rst
+++ b/docs/testing/user/userguide/advanced.rst
@@ -201,44 +201,7 @@ For example to run NFVbench with 3 PVP chains:
 
 It is not necessary to specify the service chain type (-sc) because PVP is set as default. The PVP service chains will have 3 VMs in 3 chains with this configuration.
 If ``-sc PVVP`` is specified instead, there would be 6 VMs in 3 chains as this service chain has 2 VMs per chain.
-Both **single run** or **NDR/PDR** can be run as multichain. Running multichain is a scenario closer to a real life situation than runs with a single chain.
-
-
-External Chain
---------------
-
-NFVbench can measure the performance of 1 or more L3 service chains that are setup externally. Instead of being setup by NFVbench,
-the complete environment (VMs and networks) has to be setup prior to running NFVbench.
-
-Each external chain is made of 1 or more VNFs and has exactly 2 end network interfaces (left and right network interfaces) that are connected to 2 neutron networks (left and right networks).
-The internal composition of a multi-VNF service chain can be arbitrary (usually linear) as far as NFVbench is concerned,
-the only requirement is that the service chain can route L3 packets properly between the left and right networks.
-
-To run NFVbench on such external service chains:
-
-- explicitly tell NFVbench to use external service chain by adding ``-sc EXT`` or ``--service-chain EXT`` to NFVbench CLI options
-- specify the number of external chains using the ``-scc`` option (defaults to 1 chain)
-- specify the 2 end point networks of your environment in ``external_networks`` inside the config file.
-    - The two networks specified there have to exist in Neutron and will be used as the end point networks by NFVbench ('napa' and 'marin' in the diagram below)
-- specify the router gateway IPs for the external service chains (1.1.0.2 and 2.2.0.2)
-- specify the traffic generator gateway IPs for the external service chains (1.1.0.102 and 2.2.0.102 in diagram below)
-- specify the packet source and destination IPs for the virtual devices that are simulated (10.0.0.0/8 and 20.0.0.0/8)
-
-
-.. image:: images/extchain-config.png
-
-L3 routing must be enabled in the VNF and configured to:
-
-- reply to ARP requests to its public IP addresses on both left and right networks
-- route packets from each set of remote devices toward the appropriate dest gateway IP in the traffic generator using 2 static routes (as illustrated in the diagram)
-
-Upon start, NFVbench will:
-- first retrieve the properties of the left and right networks using Neutron APIs,
-- extract the underlying network ID (typically VLAN segmentation ID),
-- generate packets with the proper VLAN ID and measure traffic.
-
-Note that in the case of multiple chains, all chains end interfaces must be connected to the same two left and right networks.
-The traffic will be load balanced across the corresponding gateway IP of these external service chains.
+Both **single run** or **NDR/PDR** can be run as multichain. Runnin multichain is a scenario closer to a real life situation than runs with a single chain.
 
 
 Multiflow
diff --git a/docs/testing/user/userguide/extchains.rst b/docs/testing/user/userguide/extchains.rst
new file mode 100644
index 0000000..f7c0e51
--- /dev/null
+++ b/docs/testing/user/userguide/extchains.rst
@@ -0,0 +1,77 @@
+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. SPDX-License-Identifier: CC-BY-4.0
+.. (c) Cisco Systems, Inc
+
+===============
+External Chains
+===============
+
+NFVbench can measure the performance of 1 or more L3 service chains that are setup externally using OpenStack or without OpenStack.
+Instead of being setup by NFVbench, the complete environment (VNFs and networks) must be setup prior to running NFVbench.
+
+Each external chain is made of 1 or more VNFs and has exactly 2 edge network interfaces (left and right network interfaces)
+that are connected to 2 edge networks (left and right networks).
+The 2 edge networks for each chain can either be shared across all chains or can be independent.
+
+The internal composition of a multi-VNF service chain can be arbitrary (usually linear) as far as NFVbench is concerned,
+the only requirement is that the service chain can route L3 packets properly between the left and right networks.
+
+The network topology of the service chains is defined by the "service_chain_shared_net" option in the
+NFVbench configuration file.
+
+
+Shared Edge Networks
+--------------------
+
+This option is defined when "service_chain_shared_net" is set to true.
+All chains must share the same 2 edge networks and the VNF gateway IP addresses on each edge
+must all belong to the same subnet.
+
+.. image:: images/nfvbench-ext-shared.png
+
+The main advantage of this mode is that only 2 network segments are needed to support an arbitrary number of chains.
+
+
+Multi-VLAN Edge Networks
+------------------------
+
+This option is defined when "service_chain_shared_net" is set to false (default).
+Each chain has its own dedicated left and right network and there is no inter-chain constraint
+on the VNF IP addresses since they all belong to different network segments.
+
+.. image:: images/nfvbench-ext-multi-vlans.png
+
+The advantage of this mode is that the configuration of the VNFs can be made identical (same
+gateway IP addresses, same static routes).
+However this mode requires 2 network segments per chain.
+
+
+Detailed Example
+----------------
+To run NFVbench on an external service chains using shared edge networks:
+
+- tell NFVbench to use external service chain by adding "-sc EXT" or "--service-chain EXT" to NFVbench CLI options
+- specify the number of external chains using the "-scc" option (defaults to 1 chain)
+- if OpenStack is used:
+    - specify the name of the 2 edge networks in "external_networks" in the NFVbench configuration file
+    - The two networks specified have to exist in Neutron ('napa' and 'marin' in the diagram below)
+- if OpenStack is not used:
+    - specify the VLAN id to use for the 2 edge networks in "vlans" in the NFVbench configuration file
+- specify the VNF gateway IPs for the external service chains (1.1.0.2 and 2.2.0.2)
+- specify the traffic generator gateway IPs for the external service chains (1.1.0.102 and 2.2.0.102 in diagram below)
+- specify the packet source and destination IPs for the virtual devices that are simulated (10.0.0.0/8 and 20.0.0.0/8)
+
+.. image:: images/extchain-config.png
+
+L3 routing must be enabled in the VNF and configured to:
+
+- reply to ARP requests to its public IP addresses on both left and right networks
+- route packets from each set of remote devices toward the appropriate dest gateway IP in the traffic generator using 2 static routes (as illustrated in the diagram)
+
+Upon start, NFVbench will:
+- first retrieve the properties of the left and right networks using Neutron APIs,
+- extract the underlying network ID (typically VLAN segmentation ID),
+- generate packets with the proper VLAN ID and measure traffic.
+
+Note that in the case of multiple chains, all chains end interfaces must be connected to the same two left and right networks.
+The traffic will be load balanced across the corresponding gateway IP of these external service chains.
diff --git a/docs/testing/user/userguide/images/nfvbench-ext-multi-vlans.png b/docs/testing/user/userguide/images/nfvbench-ext-multi-vlans.png
new file mode 100644
index 0000000..2ef2300
--- /dev/null
+++ b/docs/testing/user/userguide/images/nfvbench-ext-multi-vlans.png
diff --git a/docs/testing/user/userguide/images/nfvbench-ext-shared.png b/docs/testing/user/userguide/images/nfvbench-ext-shared.png
new file mode 100644
index 0000000..efe1c71
--- /dev/null
+++ b/docs/testing/user/userguide/images/nfvbench-ext-shared.png
diff --git a/docs/testing/user/userguide/index.rst b/docs/testing/user/userguide/index.rst
index c7c57c8..e83912f 100644
--- a/docs/testing/user/userguide/index.rst
+++ b/docs/testing/user/userguide/index.rst
@@ -24,10 +24,8 @@ Table of Content
    installation
    examples
    advanced
+   extchains
    fluentd
    sriov
    server
    faq
-
-
-
diff --git a/docs/testing/user/userguide/readme.rst b/docs/testing/user/userguide/readme.rst
index b437ff9..9915653 100644
--- a/docs/testing/user/userguide/readme.rst
+++ b/docs/testing/user/userguide/readme.rst
@@ -113,14 +113,10 @@ PVVP Packet Path
 ^^^^^^^^^^^^^^^^
 
 This packet path represents a single service chain with 2 loopback VNFs in sequence and 3 Neutron networks.
-The 2 VNFs can run on the same compute node (PVVP intra-node):
+The 2 VNFs will only run on the same compute node (PVVP intra-node):
 
 .. image:: images/nfvbench-pvvp.png
 
-or on different compute nodes (PVVP inter-node) based on a configuration option:
-
-.. image:: images/nfvbench-pvvp2.png
-
 
 Multi-Chaining (N*PVP or N*PVVP)
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -135,8 +131,9 @@ Example of multi-chaining with 2 concurrent PVP service chains:
 
 This innovative feature will allow to measure easily the performance of a fully loaded compute node running multiple service chains.
 
-Multi-chaining is currently limited to 1 compute node (PVP or PVVP intra-node) or 2 compute nodes (for PVVP inter-node).
-The 2 edge interfaces for all service chains will share the same 2 networks.
+Multi-chaining is currently limited to 1 compute node (VMs run on the same compute node).
+The 2 edge interfaces for all service chains can either share the same 2 networks or can use
+dedicated networks (based on a configuration option).
 The total traffic will be split equally across all chains.
 
 
@@ -195,4 +192,4 @@ NFVbench is agnostic of the virtual switch implementation and has been tested wi
 Limitations
 ***********
 NFVbench only supports VLAN with OpenStack.
-NFVbench does not support VxLAN overlays.
+VxLAN overlays is planned for a coming release.