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+===================
+OVN-SFC POC Details
+===================
+
+Purpose
+=======
+The purpose of this Proof-of-concept is to showcase Service Function
+Chaining with OVN.
+
+Scope
+=====
+
+The Scope of this document is to describe SFC using OVN and discuss
+installation and configuration of OVN to instantiate a forwarding path.
+
+Steps
+=====
+1. Install CentOS7 minimal install:
+-----------------------------------
+- Make sure to enable network interface.
+- Just create a root password. Don't create any users
+
+2. Create user:
+---------------
+Below are the instructions to create user - stack, for use with Devstack.
+
+- $ sudo useradd -s /bin/bash -d /opt/stack -m stack
+- $ echo 'stack ALL=(ALL) NOPASSWD: ALL' | sudo tee /etc/sudoers.d/stack
+- $ sudo su - stack
+
+3. Install git
+--------------
+- $ sudo yum install git -y
+
+4. clone Devstack and Networking-ovn
+------------------------------------
+- $ git clone http://git.openstack.org/openstack-dev/devstack.git
+- $ git clone http://git.openstack.org/openstack/networking-ovn.git
+- $ cd devstack
+- $ cp ../networking-ovn/devstack/local.conf.sample local.conf
+
+5. Edit the local.conf file:
+----------------------------
+- Add (uncomment and edited)
+
+ - OVN_REPO=https://github.com/doonhammer/ovs
+ - OVN_BRANCH=sfc.v30
+- Uncomment the below line
+
+ - OVN_BUILD_MODULES=False
+
+We use forked/modifed OVS for SFC usecase from John McDowall.
+
+6. Devstack Preliminaries:
+--------------------------
+- $ ./stack.sh
+- $ . ~/devstack/openrc admin
+- $ openstack keypair create demo > ~/id_rsa_demo
+- $ chmod 600 ~/id_rsa_demo
+- $ for group in $(openstack security group list -f value -c ID);
+ do openstack security group rule create --ingress --ethertype IPv4 --dst-port 22 --protocol tcp $group;
+ openstack security group rule create --ingress --ethertype IPv4 -- protocol ICMP $group;
+ done
+- $ IMAGE_ID=$(openstack image list -f value -c ID)
+
+10. Create Neutron network and subnet
+--------------------------------------
+- $ openstack network create --project admin --provider-network-type geneve n1
+- $ openstack subnet create --subnet-range 10.1.1.0/24 --network n1 n1subnet
+
+
+10. Spawn VMs
+-------------
+- Create 5 VMs, 3 VMs to act as communication end-points (a,b, and c) and two
+ VMs to act as VNFs (vnf1 & vnf2).
+- The 2 VNF VMs are created with two NICs to act as ingress and egress ports
+ (Optional)
+- Created two SFCs:
+ - SFC1: any traffic from VM a to VM b will go through vnf1
+ - SFC1: any traffic from VM a to VM c will go through vnf2 then vnf1
+
+
+A. SFC with OVN - Scenario 1:
+-----------------------------
+
+***********************
+1. create VMs and VNFs:
+***********************
+- $ openstack server create --nic net-id=n1,v4-fixed-ip=10.1.1.5 --flavor m1.nano --image $IMAGE_ID --key-name demo a
+- $ openstack server create --nic net-id=n1,v4-fixed-ip=10.1.1.6 --flavor m1.nano --image $IMAGE_ID --key-name demo b
+- $ openstack server create --nic net-id=n1,v4-fixed-ip=10.1.1.10 --nic net-id=n1,v4-fixed-ip=10.1.1.11 --flavor m1.nano --image $IMAGE_ID --key-name demo vnf1
+- $ openstack port set --name ap $(openstack port list --server a -f value -c ID)
+- $ openstack port set --name bp $(openstack port list --server b -f value -c ID)
+- $ AP_MAC=$(openstack port show -f value -c mac_address ap)
+- $ BP_MAC=$(openstack port show -f value -c mac_address bp)
+- $ openstack port set --name vnf1-pin $(openstack port list --server vnf1 --mac-address fa:16:3e:a0:e9:70 -f value -c ID)
+- $ openstack port set --name vnf1-pout $(openstack port list --server vnf1 --mac-address fa:16:3e:ae:0c:36 -f value -c ID)
+- $ f1_pin_MAC=$(openstack port show -f value -c mac_address vnf1-pin)
+- $ f1_pout_MAC=$(openstack port show -f value -c mac_address vnf1-pout)
+
+***************************************
+2. Create port-pairs, groups and chains
+***************************************
+The switch and ports UUIDs below will different in each environment.
+
+- n1 = f1de57df-04e3-456b-85c0-64fd869507ad
+- vnf1-pin = 6ec5aa3d-8440-44c9-acf3-a18914ca9b0d
+- vnf1-pout = 3f558a9d-295e-4417-9646-d46b59be97d8
+- ap = 0438495b-7de4-4bbb-b787-dff82615b541
+- bp = 1f004846-3f38-450d-8f4a-e5ed0f7228e6
+- cp = 9a72cc76-4d8d-494c-a959-8d672149c0ea
+- vnf2-pin = 6a32edc7-23d4-42ed-9cf8-c6e0009da01d
+- vnf2-pout = 8553b6d2-1433-4ab4-ab69-704d318b09af
+
+**1. Configure the port pair vnf1-PP1**
+
+- $ ovn-nbctl lsp-pair-add n1 vnf1-pin vnf1-pout vnf1-PP1 (didn't work with names)
+- $ ovn-nbctl lsp-pair-add f1de57df-04e3-456b-85c0-64fd869507ad 6ec5aa3d-8440-44c9-acf3-a18914ca9b0d 3f558a9d-295e-4417-9646-d46b59be97d8 vnf1-PP1
+
+**2. Configure the port chain PC1**
+
+- $ ovn-nbctl lsp-chain-add n1 PC1
+- $ ovn-nbctl lsp-chain-add f1de57df-04e3-456b-85c0-64fd869507ad PC1
+
+**3. Configure the port pair group PG1 and add to port chain**
+
+- $ ovn-nbctl lsp-pair-group-add PC1 PG1
+
+**4. Add port pair to port chain**
+
+- $ ovn-nbctl lsp-pair-group-add-port-pair PG1 vnf1-PP1
+
+**5. Add port chain to port classifier PCC1**
+
+- $ lsp-chain-classifier-add SWITCH CHAIN PORT DIRECTION PATH [NAME] [MATCH]
+- $ ovn-nbctl lsp-chain-classifier-add n1 PC1 bp 'entry-lport' 'bi-directional' PCC1 '';
+- $ ovn-nbctl lsp-chain-classifier-add f1de57df-04e3-456b-85c0-64fd869507ad PC1 1f004846-3f38-450d-8f4a-e5ed0f7228e6 'entry-lport' 'bi-directional' PCC1 ''
+
+*****************
+3. Validating SFC
+*****************
+
+- $ ovn-trace n1 'inport == "ap" && eth.src == "$AP_MAC" && eth.dst == "$BP_MAC"'
+
+
+B. SFC with OVN - Scenario 2:
+-----------------------------
+
+*************
+1. Create VMs
+*************
+- $ openstack server create --nic net-id=n1,v4-fixed-ip=10.1.1.7 --flavor m1.nano --image $IMAGE_ID --key-name demo c
+- $ openstack server create --nic net-id=n1,v4-fixed-ip=10.1.1.20 --nic net-id=n1,v4-fixed-ip=10.1.1.21 --flavor m1.nano --image $IMAGE_ID --key-name demo vnf2
+- $ openstack port set --name cp $(openstack port list --server c -f value -c ID)
+- $ CP_MAC=$(openstack port show -f value -c mac_address cp)
+- $ openstack port set --name vnf2-pin $(openstack port list --server vnf2 --mac-address fa:16:3e:ff:e5:76 -f value -c ID)
+- $ openstack port set --name vnf2-pout $(openstack port list --server vnf2 --mac-address fa:16:3e:4c:a3:58 -f value -c ID)
+- $ f2_pin_MAC=$(openstack port show -f value -c mac_address vnf2-pin)
+- $ f2_pout_MAC=$(openstack port show -f value -c mac_address vnf2-pout)
+
+****************
+2. Configure SFC
+****************
+
+**1. Configure the port pair vnf2-PP1**
+
+- $ ovn-nbctl lsp-pair-add n1 vnf2-pin vnf2-pout vnf2-PP1 (Didn't work with names)
+- $ ovn-nbctl lsp-pair-add f1de57df-04e3-456b-85c0-64fd869507ad 6a32edc7-23d4-42ed-9cf8-c6e0009da01d 8553b6d2-1433-4ab4-ab69-704d318b09af vnf2-PP1
+
+**2. Configure the port chain PC2**
+
+- $ ovn-nbctl lsp-chain-add n1 PC2
+- $ ovn-nbctl lsp-chain-add f1de57df-04e3-456b-85c0-64fd869507ad PC2
+
+**3. Configure the port pair group PG2 and add to port chain**
+
+- $ ovn-nbctl lsp-pair-group-add PC2 PG2
+- $ ovn-nbctl lsp-pair-group-add PC2 PG3
+
+**4. Add port pair to port chain**
+
+- $ ovn-nbctl lsp-pair-group-add-port-pair PG2 vnf2-PP1
+- $ ovn-nbctl lsp-pair-group-add-port-pair PG3 vnf1-PP1
+
+**4. Add port chain to port classifier PCC2**
+
+- $ ovn-nbctl lsp-chain-classifier-add n1 PC2 cp "entry-lport" "bi-directional" PCC2 ""
+- $ ovn-nbctl lsp-chain-classifier-add f1de57df-04e3-456b-85c0-64fd869507ad PC2 9a72cc76-4d8d-494c-a959-8d672149c0ea "entry-lport" "bi-directional" PCC2 "";
+
+********************
+3. Validate Scenario
+********************
+
+- $ ovn-trace n1 'inport == "ap" && eth.src == "$AP_MAC" && eth.dst == "$CP_MAC"'
+
+References:
+-----------
+
+1. http://docs.openvswitch.org/en/latest/tutorials/ovn-openstack/
+2. https://gist.github.com/voyageur/a26943eced3324b302f1ffede45252bd
+3. https://github.com/doonhammer/ovs