README-native-tunneling.md

   1 Native Tunneling in Open vSwitch userspace
   2 ------------------------------------------
   3
   4 Open vSwitch supports tunneling in userspace. Tunneling is implemented in
   5 platform independent way.
   6
   7 Setup:
   8 ======
   9 Setup physical bridges for all physical interfaces. Create integration bridge.
  10 Add VXLAN port to int-bridge. Assign IP address to physical bridge where
  11 VXLAN traffic is expected.
  12
  13 Example:
  14 ========
  15 Connect to VXLAN tunnel endpoint logical ip: 192.168.1.2 and 192.168.1.1.
  16
  17 Configure OVS bridges as follows.
  18
  19 1. Lets assume 172.168.1.2/24 network is reachable via eth1 create physical bridge br-eth1
  20    assign ip address (172.168.1.1/24) to br-eth1, Add eth1 to br-eth1
  21 2. Check ovs cached routes using appctl command
  22    ovs-appctl ovs/route/show
  23    Add tunnel route if not present in OVS route table.
  24    ovs-appctl ovs/route/add 172.168.1.1/24 br-eth1
  25 3. Add integration brdge int-br and add tunnel port using standard syntax.
  26    ovs-vsctl add-port int-br vxlan0 -- set interface vxlan0 type=vxlan  options:remote_ip=172.168.1.2
  27 4. Assign IP address to int-br, So final topology looks like:
  28
  29
  30        192.168.1.1/24
  31        +--------------+
  32        |    int-br    |                                   192.168.1.2/24
  33        +--------------+                                  +--------------+
  34        |    vxlan0    |                                  |    vxlan0    |
  35        +--------------+                                  +--------------+
  36              |                                                 |
  37              |                                                 |
  38              |                                                 |
  39         172.168.1.1/24                                         |
  40        +--------------+                                        |
  41        |    br-eth1   |                                  172.168.1.2/24
  42        +--------------+                                  +---------------+
  43        |    eth1      |----------------------------------|    eth1       |
  44        +--------------+                                  +----------------
  45
  46        Host A with OVS.                                      Remote host.
  47
  48 With this setup, ping to VXLAN target device (192.168.1.2) should work
  49 There are following commands that shows internal tables:
  50
  51 Tunneling related commands:
  52 ===========================
  53 Tunnel routing table:
  54     To Add route:
  55        ovs-appctl ovs/route/add <IP address>/<prefix length> <output-bridge-name> <gw>
  56     To see all routes configured:
  57        ovs-appctl ovs/route/show
  58     To del route:
  59        ovs-appctl ovs/route/del <IP address>/<prefix length>
  60
  61 ARP:
  62     To see arp cache content:
  63        ovs-appctl tnl/arp/show
  64     To flush arp cache:
  65        ovs-appctl tnl/arp/flush
  66
  67 To check tunnel ports listening in vswitchd:
  68      ovs-appctl tnl/ports/show
  69
  70 To set range for VxLan udp source port:
  71      To set:
  72          ovs-appctl tnl/egress_port_range <num1> <num2>
  73      Shows Current range:
  74          ovs-appctl tnl/egress_port_range
  75
  76 To check datapath ports:
  77      ovs-appctl dpif/show
  78
  79 To check datapath flows:
  80      ovs-appctl dpif/dump-flows
  81
  82 Contact
  83 =======
  84 bugs@openvswitch.org