[ovs-dev] [PATCH] Add a tutorial for advanced Open vSwitch features.

[Ben Pfaff]

On Thu, Apr 18, 2013 at 02:42:10PM -0300, Luiz Ozaki wrote:
> On 4/17/13 8:03 PM, Ben Pfaff wrote:
> >+ovs-ofctl add-flows br0 - <<'EOF'
> >+    table=4 reg0=0 priority=99 dl_vlan=20 actions=1,strip_vlan,2
> >+    table=4 reg0=0 priority=99 dl_vlan=30 actions=1,strip_vlan,3,4
> >+    table=4 reg0=0 priority=50            actions=1
> >+EOF
> 
> Wouldn't the last flow (table=4 reg0=0 priority=50 actions=1) cause
> the flooeded packet that came from the trunk to be flooded back to
> the trunk ?

Keep reading, please:

    >>> Our rules rely on the standard OpenFlow behavior that an output
        action will not forward a packet back out the port it came in on.
        That is, if a packet comes in on p1, and we've learned that the
        packet's destination MAC is also on p1, so that we end up with
        "actions=1" as our actions, the switch will not forward the packet
        back out its input port.  The multicast/broadcast/unknown
        destination cases above also rely on this behavior.

> It would be nice to have a link to this on the OVS page ;)

Sure, after it gets reviewed and committed, I'll add a link.