Linux release or using the kernel module paired with the userspace
distribution.
+Q: Why do tunnels not work when using a kernel module other than the
+ one packaged with Open vSwitch?
+
+A: Support for tunnels was added to the upstream Linux kernel module
+ after the rest of Open vSwitch. As a result, some kernels may contain
+ support for Open vSwitch but not tunnels. The minimum kernel version
+ that supports each tunnel protocol is:
+
+ Protocol Linux Kernel
+ -------- ------------
+ GRE 3.11
+ VXLAN 3.12
+ LISP <not upstream>
+
+ If you are using a version of the kernel that is older than the one
+ listed above, it is still possible to use that tunnel protocol. However,
+ you must compile and install the kernel module included with the Open
+ vSwitch distribution rather than the one on your machine. If problems
+ persist after doing this, check to make sure that the module that is
+ loaded is the one you expect.
+
Q: What features are not available when using the userspace datapath?
A: Tunnel virtual ports are not supported, as described in the
dumps datapath flows for only the specified bridge, regardless
of the type.
+Q: How does multicast snooping works with VLANs?
+
+A: Open vSwitch maintains snooping tables for each VLAN.
+
Performance
-----------
OpenFlow controller doesn't see the VLANs that I expect," and you
can refer to the answer there for more information.
+Q: How MAC learning works with VLANs?
+
+A: Open vSwitch implements Independent VLAN Learning (IVL) for
+ OFPP_NORMAL action. I.e. it logically has separate learning tables
+ for each VLANs.
+
VXLANs
-----
A: The following table lists the versions of OpenFlow supported by
each version of Open vSwitch:
- Open vSwitch OF1.0 OF1.1 OF1.2 OF1.3 OF1.4
- =============== ===== ===== ===== ===== =====
- 1.9 and earlier yes --- --- --- ---
- 1.10 yes --- [*] [*] ---
- 1.11 yes --- [*] [*] ---
- 2.0 yes [*] [*] [*] ---
- 2.1 yes [*] [*] [*] ---
- 2.2 yes [*] [*] [*] [%]
- 2.3 yes yes yes yes [%]
+ Open vSwitch OF1.0 OF1.1 OF1.2 OF1.3 OF1.4 OF1.5
+ =============== ===== ===== ===== ===== ===== =====
+ 1.9 and earlier yes --- --- --- --- ---
+ 1.10 yes --- [*] [*] --- ---
+ 1.11 yes --- [*] [*] --- ---
+ 2.0 yes [*] [*] [*] --- ---
+ 2.1 yes [*] [*] [*] --- ---
+ 2.2 yes [*] [*] [*] [%] [*]
+ 2.3 yes yes yes yes [*] [*]
[*] Supported, with one or more missing features.
- [%] Support is unsafe: ovs-vswitchd will abort when certain
- unimplemented features are tested.
+ [%] Experimental, unsafe implementation.
Open vSwitch 2.3 enables OpenFlow 1.0, 1.1, 1.2, and 1.3 by default
in ovs-vswitchd. In Open vSwitch 1.10 through 2.2, OpenFlow 1.1,
- 1.2, and 1.3 must be enabled manually in ovs-vswitchd. Either way,
+ 1.2, and 1.3 must be enabled manually in ovs-vswitchd. OpenFlow
+ 1.4 and 1.5 are also supported, with missing features, in Open
+ vSwitch 2.3 and later, but not enabled by default. In any case,
the user may override the default:
- To enable OpenFlow 1.0, 1.1, 1.2, and 1.3 on bridge br0:
ovs-vsctl set bridge br0 protocols=OpenFlow10,OpenFlow11,OpenFlow12,OpenFlow13
+ - To enable OpenFlow 1.0, 1.1, 1.2, 1.3, 1.4, and 1.5 on bridge br0:
+
+ ovs-vsctl set bridge br0 protocols=OpenFlow10,OpenFlow11,OpenFlow12,OpenFlow13,OpenFlow14,OpenFlow15
+
- To enable only OpenFlow 1.0 on bridge br0:
ovs-vsctl set bridge br0 protocols=OpenFlow10
ovs-ofctl -O OpenFlow13 dump-flows br0
- OpenFlow 1.4 is a special case, because it is not implemented
- safely: ovs-vswitchd will abort when certain unimplemented features
- are tested. Thus, for now it is suitable only for experimental
- use. ovs-vswitchd will only allow OpenFlow 1.4 to be enabled
- (which must be done in the same way described above) when it is
- invoked with a special --enable-of14 command line option.
+ (Open vSwitch 2.2 had an experimental implementation of OpenFlow
+ 1.4 that could cause crashes. We don't recommend enabling it.)
OPENFLOW-1.1+ in the Open vSwitch source tree tracks support for
- OpenFlow 1.1 and later features. When support for OpenFlow 1.4 is
- solidly implemented, Open vSwitch will enable that version by
- default.
+ OpenFlow 1.1 and later features. When support for OpenFlow 1.4 and
+ 1.5 is solidly implemented, Open vSwitch will enable those version
+ by default. Also, the OpenFlow 1.5 specification is still under
+ development and thus subject to change.
Q: Does Open vSwitch support MPLS?
priority=5,in_port=1,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00,actions=2
priority=5,in_port=2,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00,actions=1
+Q: My bridge disconnects from my controller on add-port/del-port.
+
+A: Reconfiguring your bridge can change your bridge's datapath-id because
+ Open vSwitch generates datapath-id from the MAC address of one of its ports.
+ In that case, Open vSwitch disconnects from controllers because there's
+ no graceful way to notify controllers about the change of datapath-id.
+
+ To avoid the behaviour, you can configure datapath-id manually.
+
+ ovs-vsctl set bridge br0 other-config:datapath-id=0123456789abcdef
+
Development
-----------
projects / cascardo / ovs.git / blobdiff