On Fri, Mar 15, 2013 at 05:22:52PM +0400, Andrey Korolyov wrote:
> I had run recently into strange issue - when I set controller to the
> live one(running floodlight, for example), fake bridges stop pushing
> vlan tags and only when controller is deleted or set to 'blackhole'
> address:port value on which nobody is listening, tags working again.
This is a FAQ.
Q: My OpenFlow controller doesn't see the VLANs that I expect.
A: The configuration for VLANs in the Open vSwitch database (e.g. via
ovs-vsctl) only affects traffic that goes through Open vSwitch's
implementation of the OpenFlow "normal switching" action. By
default, when Open vSwitch isn't connected to a controller and
nothing has been manually configured in the flow table, all traffic
goes through the "normal switching" action. But, if you set up
OpenFlow flows on your own, through a controller or using ovs-ofctl
or through other means, then you have to implement VLAN handling
yourself.
You can use "normal switching" as a component of your OpenFlow
actions, e.g. by putting "normal" into the lists of actions on
ovs-ofctl or by outputting to OFPP_NORMAL from an OpenFlow
controller. In situations where this is not suitable, you can
implement VLAN handling yourself, e.g.:
- If a packet comes in on an access port, and the flow table
needs to send it out on a trunk port, then the flow can add
the appropriate VLAN tag with the "mod_vlan_vid" action.
- If a packet comes in on a trunk port, and the flow table
needs to send it out on an access port, then the flow can
strip the VLAN tag with the "strip_vlan" action.
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