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===== Set up an IPv6 vRouter on a Service VM in OpenStack + ML2 OVS Environment =====

Here you will find the steps involved in creating a ServiceVM that acts as an IPv6 vRouter.\\
In this example, we will be using a CentOS7 image as vRouter (we should be able to use other OS as well) and devstack for OpenStack installation.
 
Enable port_security extension as the extension_drivers in ml2 configuration file.\\ 
Following is a sample configuration of devstack local.conf file.

    [[local|localrc]]
    DATA_DIR=$DEST/data
    SCREEN_LOGDIR=$DATA_DIR/logs
    LOGFILE=$SCREEN_LOGDIR/stack.sh.log
    ADMIN_PASSWORD=password
    MYSQL_PASSWORD=password
    RABBIT_PASSWORD=password
    SERVICE_PASSWORD=password
    SERVICE_TOKEN=token
    disable_service n-net tempest h-eng h-api h-api-cfn h-api-cw
    enable_service q-svc q-dhcp q-meta q-agt q-l3 n-novnc
    [[post-config|/$Q_PLUGIN_CONF_FILE]]
    [ml2]
    extension_drivers=port_security

After successful installation of OpenStack with the above configuration, we shall create the necessary neutron networks/subnets/ports etc.\\
    cd devstack
    ./stack.sh

Source the tenant credentials.
    source openrc admin demo

    # Create a Neutron router which provides external connectivity.
    neutron router-create router1
    # Create an external network using the appropriate values based on the data-center physical network setup.
    neutron net-create --provider:network_type <flat/vlan> --provider:physical_network <physical-network> --provider:segmentation_id <segmentation-id-if-vlan> --router:external ext-net
    # Configure ipv6_gateway=<LLA-of-upstream-router> in the Neutron L3 agent configuration file.
    # Associate the ext-net to the neutron router.
    neutron router-gateway-set router1 ext-net
    # Create an IPv6 internal network.
    neutron net-create ipv6-internal-network
    # Create an IPv6 subnet in the internal network.
    neutron subnet-create --name ipv6-int-subnet --ip-version 6 --ipv6-ra-mode slaac --ipv6-address-mode slaac ipv6-internal-network 2001:db8:0:1::/64
    # Associate the internal subnet to a neutron router. 
    neutron router-interface-add router1 ipv6-int-subnet
     

Now we shall create an isolated network which is the internal network of vRouter.\\ 

    # Create an isolated router for the tenant internal network.
    neutron router-create router2
    # Create a Neutron Internal Network.
    neutron net-create tenant-internal-network 
    # Create an IPv4 subnet in the internal network.
    neutron subnet-create --name ipv4-int-subnet tenant-internal-network 10.0.0.1/24
    # Associate the router2 to IPv4 subnet created above.
    neutron router-interface-add <router2-id> <ipv4-int-subnet-id>

Mapping this configuration to [[ipv6_opnfv_project:poc_design|POC-1]].
    ipv6-internal-network and ext-net is the Red colored network.
    tenant-internal-network is the Green colored network.

Lets create two neutron ports one from ext-net and the other from tenant-internal-network for the vRouter VM
    neutron port-create ipv6-internal-network --port-security-enabled=False --name enp0s3-port
    neutron port-create tenant-internal-network --port-security-enabled=False --name enp0s8-port

Download the Centos7 image which is used as vRouter.
    glance image-create --name 'Centos7' --disk-format qcow2 --container-format bare --is-public true --copy-from http://cloud.centos.org/centos/7/images/CentOS-7-x86_64-GenericCloud.qcow2
    
Create a keypair. 
    nova keypair-add vRouterKey > ~/vRouterKey

Spawn the Centos7 image with two nics (i.e., enp0s3-port and enp0s8-port)
    nova boot --image <Centos7-image-id> –flavor m1.small --nic port-id=$(neutron port-show -f value -F id enp0s3-port) –nic --nic port-id=$(neutron port-show -f value -F id enp0s8-port) --key-name vRouterKey CentOSvRouter
    
Verify that CentOSvRouter boots up successfully and keypair is injected. 
    nova list
    nova console-log CentOSvRouter

After the image boots up successfully, from the router1 namespace, ssh to vRouter using the keypair.
    sudo ip netns
    sudo ip netns exec <router1-namespace> bash
    ssh -i ~/vRouterKey centos@<ip-address-of-the-image>
    
As a one time job, before we can create the snapshot, execute the steps (i.e., SLAAC setup) mentioned at the following link.
    https://wiki.opnfv.org/ipv6_opnfv_project/vm_as_router

In order to verify that the setup is working, lets create some cirros VMs on the "tenant-internal-network" (i.e., vRouter internal network).
    nova boot --image <Cirros-image-id> --flavor m1.tiny --nic net-id=<tenant-internal-network-id> VM1
    nova boot --image <Cirros-image-id> --flavor m1.tiny --nic net-id=<tenant-internal-network-id> VM2

Confirm that both the VMs have successfully booted up. 
    nova list
    nova console-log VM1
    nova console-log VM2

Add the necessary security group ingress rules.
    source openrc demo demo
    # SSH access to the VMs
    neutron security-group-rule-create --direction ingress --protocol tcp --port-range-min 22 --port-range-max 22 --remote-ip-prefix 10.0.0.0/24 default
    # Permit IPv6 Router Advts from the vRouter internal interface to the VMs.
    neutron security-group-rule-create --direction ingress --ethertype IPv6 --protocol icmpv6 --port-range-min 134 --remote-ip-prefix fe80::/64 default
    
SSH to the cirros VMs to check the IPv6 forwarding use-case.
    sudo ip netns
    sudo ip netns exec <router2-namespace> bash
    ssh cirros@<ip-address-of-the-image>
    Note: default password of cirros image would be "cubswin:)"
    
Verify that Cirros image has an IPv6 address assigned via SLAAC with a prefix of "2001:db8:0:2::/64"
    ip address 
    # verify that default route points to the LLA of enp0s8 interface of vRouter.
    ip -6 route 

Try pinging to the internal router interface of router1 (i.e., 2001:db8:0:1::1/64)
    ping6 2001:db8:0:1::1/64

If all goes well, ping6 should succeed which shows that vRouter is forwarding the IPv6 traffic of instances on the tenant-internal-network.

At this state, we can create a snapshot of the CentOSvRouter and use it in any other similar OpenStack setup.
    nova image-create <CentOSvRouter-id> <Snapshot-name>
    nova image-list #You will find the snapshot you just created above.
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