Multiple OVS switches within single host - OverFlowJAMK/General GitHub Wiki

First create virtual ethernet interfaces (veth)

# sudo ip link add veth0 type veth peer name veth1 <- Here we create 2 interfaces and link them together with endpoint names veth0 and veth1

For the next step you'll probably want to bring them up:
# sudo ifconfig veth0 up && sudo ifconfig veth1 up <- nothing to explain here, but remember to do this anyway

Second you'll need to create a new bridge (to connect to)

# sudo ovs-vsctl add-br br1 <- here you create a new bridge named "br1"

Third you connect our newly created veth-interfaces to new(br1) and old(br0) bridges

# sudo ovs-vsctl add-port br0 veth0 && sudo ovs-vsctl add-port br1 veth1

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optional: Move physical interface from old bridge to a new one

# sudo ovs-vsctl del-port br0 eth1 <- in our example the old interface is eth1
# sudo ovs-vsctl add-port br1 eth1 <- add the old interface to a new bridge

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Add controller to a new bridge

# sudo ovs-vsctl set-controller br1 tcp:10.0.0.1:6633 <- this may vary based on your network settings

You can also create a bash script

# sudo vim scriptname.sh <- you can also use nano or other text editors of your choice

#Basically you add all the needed lines in the file

sudo ip link add veth0 type veth peer name veth1
sudo ifconfig veth0 up && sudo ifconfig veth1 up
sudo ovs-vsctl add-br br1
sudo ovs-vsctl add-port br0 veth0 && sudo ovs-vsctl add-port br1 veth1
#sudo ovs-vsctl del-port br0 eth1 #optional
#sudo ovs-vsctl add-port br1 eth1 #optional
sudo ovs-vsctl set-controller br1 tcp:10.0.0.1:6633