Prepare for post-1.11.0 (1.11.90).

[sliver-openvswitch.git] / FAQ

diff --git a/FAQ b/FAQ
index a8e3772..6d260aa 100644 (file)
--- a/FAQ
+++ b/FAQ
@@ -816,6 +816,21 @@ A: It is to be expected that the VMs can't access each other.  VLANs
    the machines you are trying to access are not on VLAN 9 (or 10) and
    that the Internet is not available on VLAN 9 (or 10).
 
+Q: I added a pair of VMs on the same VLAN, like this:
+
+       ovs-vsctl add-br br0
+       ovs-vsctl add-port br0 eth0
+       ovs-vsctl add-port br0 tap0 tag=9
+       ovs-vsctl add-port br0 tap1 tag=9
+
+    The VMs can access each other, but not the external network or the
+    Internet.
+
+A: It seems likely that the machines you are trying to access in the
+   external network are not on VLAN 9 and that the Internet is not
+   available on VLAN 9.  Also, ensure VLAN 9 is set up as an allowed
+   trunk VLAN on the upstream switch port to which eth0 is connected.
+
 Q: Can I configure an IP address on a VLAN?
 
 A: Yes.  Use an "internal port" configured as an access port.  For
@@ -875,6 +890,41 @@ A: Do you have a controller configured on br0 (as the commands above
    can refer to the answer there for more information.
 
 
+VXLANs
+-----
+
+Q: What's a VXLAN?
+
+A: VXLAN stands for Virtual eXtensible Local Area Network, and is a means
+   to solve the scaling challenges of VLAN networks in a multi-tenant
+   environment. VXLAN is an overlay network which transports an L2 network
+   over an existing L3 network. For more information on VXLAN, please see
+   the IETF draft available here:
+
+   http://tools.ietf.org/html/draft-mahalingam-dutt-dcops-vxlan-03
+
+Q: How much of the VXLAN protocol does Open vSwitch currently support?
+
+A: Open vSwitch currently supports the framing format for packets on the
+   wire. There is currently no support for the multicast aspects of VXLAN.
+   To get around the lack of multicast support, it is possible to
+   pre-provision MAC to IP address mappings either manually or from a
+   controller.
+
+Q: What destination UDP port does the VXLAN implementation in Open vSwitch
+   use?
+
+A: By default, Open vSwitch will use the assigned IANA port for VXLAN, which
+   is 4789. However, it is possible to configure the destination UDP port
+   manually on a per-VXLAN tunnel basis. An example of this configuration is
+   provided below.
+
+   ovs-vsctl add-br br0
+   ovs-vsctl add-port br0 vxlan1 -- set interface vxlan1
+       type=vxlan options:remote_ip=192.168.1.2 options:key=flow
+       options:dst_port=8472
+
+
 Using OpenFlow (Manually or Via Controller)
 -------------------------------------------