[ovs-discuss] why is ovs for forwarding my packet?

[Flavio Leitner]

On Sat, Sep 13, 2014 at 11:40:21PM +0200, Ronald van der Pol wrote:
> On Fri, Sep 12, 2014 at 21:10:27 +0200, Ronald van der Pol wrote:
> 
> > This is my setup (part of OpenStack compute node):
> > 
> >    eth1    +---------+  phy-br-p2p2
> > A  --------+ br-p2p2 +---------------  B
> >            +---------+
> > 
> > The problem is this. B sends an ARP request to A, A answers with
> > an ARP reply. I see this reply packet on eth1, but not on phy-br-p2p2.
> > It is using VLAN 3810.
> 
> When I add eth1.3810 to br-p2p2 instead of eth1 and I set up a
> flow entry with action "mod_vlan_vid:3810,normal", it works.
> Don't quite understand yet what is different from forwarding
> tagged frames using eth1.

It sounds like the ARP reply is coming out of the VLAN 3810, so
the switch is just dropping it.

When you use mod_vlan_vid, you are working around the issue by
putting the reply into vlan 3810.

fbl