Ben,

I thought the action=output:2 will forward this to port 2 on my br-tunnel 
bridge (with a modified VLAN tag). Am I incorrect?

Also, yes there are 2 ovs bridges. This flow is on the second bridge that is 
connected to the physical nic. The first ovs-bridge has the gre tunnel 
encapsulation.

Thanks,
Kevan.

-----Original Message-----
From: Ben Pfaff [mailto:[email protected]]
Sent: 01 October 2013 16:06
To: Kevan McColgan
Cc: [email protected]
Subject: Re: [ovs-discuss] Adding VLAN tag to GRE Tunnel Header

On Tue, Oct 01, 2013 at 02:18:33PM +0000, Kevan McColgan wrote:
> We have a GRE tunnel between 2 ovs instances. We are trying to add a
> vlan tag to the GRE tunnel header.
>
> We are using this opeflow definition:
> ovs-ofctl add-flow br-tunnel in_port=1,actions=output:2,mod_vlan_id:15

That command doesn't make any sense.  It does header modifications but never 
subsequently sends the packet anywhere, so of course the header modifications 
don't take effect.

> However, the vlan tag of 15 is not being added to the GRE header. Can
> anyone shed some light on if we are missing some config?

You'll have to do this after the tunnel encapsulates the packet.  If the 
tunnel's output is routed through a second OVS bridge, then you could do it 
there; otherwise, iptables might be able to do this (I don't know).

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