Open vSwitch (OVS)

Here are the steps to get Open vSwitch loaded up.  There are other directions out there.  This is one of them.

# Add CentOS repo for Open vSwitch and enable it to autostart on reboots
dnf install -y centos-release-nfv-openvswitch
dnf install -y openvswitch3.1
systemctl enable openvswitch

# Enable IPRouting
cat > /etc/sysctl.d/iprouting.conf << "EOF"
net.ipv4.ip_forward=1
net.ipv4.conf.all.rp_filter = 2
EOF

# Reboot server or manually activate routing and start openvswitch
sysctl --system
systemctl start openvswitch

# Check if the database is good to go
ovs-vsctl show

Should look something like this...

Optional:

# Disable IPv6
cat > /etc/sysctl.d/disable-ipv6-all.conf << "EOF"
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
EOF

# Disable IPv6 Bridge
cat > /etc/sysctl.d/disable-ipv6-bridge.conf << "EOF"
net.bridge.bridge-nf-call-ip6tables=0
net.bridge.bridge-nf-call-iptables=0
net.bridge.bridge-nf-call-arptables=0
EOF