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+Openvswitch Native tunneling configuration guide
+=======================================================
+
+This guide is for configuring userspace tunneling in Open-vSwitch. The
+traditional OVS with kernel datapath uses kernel module to perform the tunneling
+however this setup performs all the tunneling operations purely in the
+userspace. This way userspace-tunnelling is platform independent.
+
+This setup needs an additional bridge called “br-phy1” when compared to the
+kernel based OVS. The purpose of this bridge is to make available the kernel
+network stack for routing and arp resolution. The data path needs to look-up
+the routing table and arp table to prepare the tunnel header and xmit data to
+the output port.
+
+The tunneling setup is found as below:
+
+    +--------------+
+    |     VM-0     | 192.168.1.1/24
+    +--------------+
+       (vm_port0)
+           |
+           |
+           |
+           |
+           |
+    +--------------+
+    |   br-int     |                           192.168.1.2/24
+    +--------------+                          +--------------+
+    |   vxlan0     |                          |    vxlan0    |
+    +--------------+                          +--------------+
+           |                                          |
+           |                                          |
+           |                                          |
+           |                                          |
+           |                                          |
+           |                                          |
+     172.168.1.1/24                                   |
+    +--------------+                                  |
+    |   br-phy1    |                            172.168.1.2/24
+    +--------------+                          +---------------+
+    | dpdk0/eth1   |==========================|      eth1     |
+    +--------------+                          +---------------+
+     Host A with OVS.                            Remote host.
+
+#### Prerequisites
+The host must be pre-installed with OVS-DPDK, QEMU and virtual machine images.
+Please refer the installation guide of relevant modules for these instructions.
+ovs-vswitchd and OVSDB server must be up and running before proceeding to any
+of the configuration steps.
+
+This setup guide covers only the required steps for setting up VxLAN userspace
+tunneling. The same approach can be used for any other tunneling protocols, by
+specifying the appropriate tunneling protocol type.
+
+Note:- This configuration guide is for setting up the VxLAN tunneling on one
+host(local host). The same steps have to perform on the remote host as well for
+setting up a VM<->VM VxLAN tunnel setup. The only difference for setting up the
+userspace-tunneling in remote node is , VM and VxLAN tunnel ip addresses are
+different.
+
+#### Configuration steps
+1.	Create the “br-int” bridge as below,
+
+  ***HOST-A$ sudo ovs-vsctl --may-exist add-br br-int -- set Bridge br-int datapath_type=netdev --  br-set-external-id br-int bridge-id br-int -- set bridge br-int fail-mode=standalone***
+
+2.	Add the VM interface to the “br-int”.
+
+  ***HOST-A$ sudo ovs-vsctl add-port br-int vm_port0 -- set Interface vm_port0 type=dpdkvhostuser***
+
+  `[“vm_port0” is the vhost-user interface name for the VM0. This interface name
+must be used while qemu starting the virtual machine.]`
+
+3.	Start the VM(VM-0) using vhost-user network backend. The vhost-user
+interface name is "vm_port0".
+
+4.	Set the Ip address 192.168.1.1 to the VM interface. Run the following
+command inside the VM to set the Ip address.
+
+  ***VM-0$ sudo ip addr add 192.168.1.1/24 dev eth0***
+
+  `[“eth0” is the interface inside VM. its possible to set the ip address using
+"ifconfig" command as "sudo ifconfig eth0 192.168.1.1/24". Please use either
+one command to set the ip address.]`
+
+5.	Attach the VxLAN tunnel interface to the “br-int“ bridge.
+
+  ***HOST-A$ sudo ovs-vsctl add-port br-int vxlan0 -- set interface vxlan0 type=vxlan options:remote_ip=172.168.1.2***
+
+  `[“172.168.1.2” is the remote tunnel end point address, On remote host this
+will be 172.168.1.1.]`
+
+6.	Create the “br-phy1” bridge for attaching the physical interface.
+
+  ***HOST-A$ sudo ovs-vsctl --may-exist add-br br-phy1 -- set Bridge br-phy1 datapath_type=netdev -- br-set-external-id br-phy1 bridge-id br-phy1 -- set bridge br-phy1 fail-mode=standalone other_config:hwaddr="&lt;mac address of eth1 interface&gt;"***
+
+  `[“eth1” is the physical interface on the host, Assign mac address of “eth1”
+to the “br-phy1”.]`
+
+7.	The physical port "eth1" can operate either as a KNI(kernel network
+interface) or a DPDK interface. Depending on the operating mode, attach "eth1"
+to the "br-phy1" bridge as follows.
+
+  Use step-7 if "eth1" is KNI. Please follow Step :8 rather than this step in
+case "eth1" is a DPDK Interface.This step will cause to loose the connectivity
+through “eth1” (refer configuration problems in  https://github.com/openvswitch/ovs/blob/master/FAQ.md for more details) for a
+while. The connectivity can be restored by moving the IP address to the
+“br-phy1” internal interface. The following command-set will do that,
+
+  ***HOST-A$ sudo ovs-vsctl --timeout 10 add-port br-phy1 eth1***
+
+  ***HOST-A$ sudo ip addr add 172.168.1.1/24 dev br-phy1***
+
+  ***HOST-A$ sudo ip link set br-phy1 up***
+
+  ***HOST-A$ sudo ip addr flush dev eth1 2>/dev/null***
+
+  ***HOST-A$ sudo ip link set eth1 up***
+
+  ***HOST-A$ sudo iptables –F***
+
+8.	Steps for attaching “eth1” to “br-phy1” is slightly different in case
+“eth1” is a DPDK interface. DPDK interfaces are not managed by the kernel, so
+the port details are not visible on any “ip” commands.
+
+  ***HOST-A$ sudo ./tools/dpdk_nic_bind.py --bind=igb_uio eth1***
+
+  `["dpdk_nic_bind.py" is a utility script to bind/unbind interfaces to DPDK/Linux
+kernel.More details on bind/unbind can be found at http://dpdk.org/doc/guides/linux_gsg/build_dpdk.html#binding-and-unbinding-network-ports-to-from-the-kernel-modules]`
+
+  ***HOST-A$ sudo ovs-vsctl --timeout 10 add-port br-phy1 dpdk0 -- set Interface dpdk0 type=dpdk***
+
+  ***HOST-A$ sudo ip addr add 172.168.1.1/24 dev br-phy1***
+
+  ***HOST-A$ sudo ip link set br-phy1 up***
+
+  ***HOST-A$ sudo iptables –F***
+
+  `[“eth1” is mapped to DPDK port “dpdk0”. DPDK driver assign port names that
+starts with “dpdk”]`
+
+Now the traffic from “VM0” will be VxLAN encapsulated and send out over eth1/dpdk0
+interface.
+
+TCPDUMP doesnt work on DPDK interfaces(eth0) as its no longer managed by the kernel.
+
+#### Debugging
+
+*	Verify the created tunnel port details.
+
+  ***HOST-A$ sudo ovs-appctl tnl/ports/show***
+
+*	As mentioned before, its necessary that the vswitch should have the arp-table
+entries to do tunnelling at userspace. The learned arp entries in the vswitch
+can be verified by,
+
+  ***HOST-A$ sudo ovs-appctl tnl/arp/show***
+
+  the arp entries can be flushed using,
+
+  ***HOST-A$ sudo ovs-appctl tnl/arp/flush***
+
+  To set a specific arp entry,
+
+  ***HOST-A$ sudo ovs-appctl tnl/arp/set &lt;bridge&gt; &lt;ip addr&gt; &lt;mac addr&gt;***
+
+ In the above test setup, the following arp entries has to set in case they are
+ not present.
+
+  ***HOST-A$ sudo ovs-appctl tnl/arp/set br-int 172.168.1.1 &lt;mac addr of br-phy1&gt;***
+
+  ***HOST-A$ sudo ovs-appctl tnl/arp/set br-phy1 172.168.1.2 &lt;mac addr of remote TEP&gt;***
+
+*	Similarly OVS uses routing table entries to xmit the tunnel packets. The
+vswitch routing entries can be verified by,
+
+  ***HOST-A$ sudo ovs-appctl ovs/route/show***
+
+  To delete the route entries.
+
+  ***HOST-A$ sudo ovs-appctl ovs/route/del***
+
+*	To lookup a route entry for a destination please use,
+
+  ***HOST-A$ ovs-appctl ovs/route/lookup***
+
+* In case the route entries are missing for tunnel packet forwarding, it can be
+added using the following command,
+
+  ***HOST-A$ sudo ovs-appctl ovs/route/add 172.168.1.1/24 br-phy1***
+
+   This command instructs OVS to route all traffic destined for “172.168.1.2” to
+ bridge “br-phy1”
+
+* To verify the range of tunneling source ports,
+
+  ***HOST-A$ sudo ovs-appctl tnl/egress_port_range***
+
+* To see the configured datapath ports,
+
+  ***HOST-A$ sudo ovs-appctl dpif/show***
+
+* To verify the flows programmed on the OVS datapath,
+
+  ***HOST-A$ sudo ovs-appctl dpctl/dump-flows***
+
+    [This command shows how OVS forwards the packets in datapath.]
