upgrade to new signature of update_flags

[sliver-openvswitch.git] / FAQ

diff --git a/FAQ b/FAQ
index a8e3772..1f0f841 100644 (file)
--- a/FAQ
+++ b/FAQ
@@ -126,7 +126,7 @@ A: All official releases have been through a comprehensive testing
    LTS release, we will provide an updated release that includes the
    fix.  Releases that are not LTS may not be fixed and may just be
    supplanted by the next major release.  The current LTS release is
-   1.4.x.
+   1.9.x.
 
 Q: What Linux kernel versions does each Open vSwitch release work with?
 
@@ -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)
 -------------------------------------------