[ovs-dev] [ovs-discuss] [PATCH v2] [PATCH] QinQ: support more vlan headers.

[Ben Pfaff]

On Mon, Sep 10, 2018 at 03:15:21PM -0400, Eric Garver wrote:
> On Mon, Sep 10, 2018 at 03:03:19AM +0000, Lilijun (Jerry, Cloud Networking) wrote:
> > Hi Eric,
> > 
> > Yes, I agree with that effect. 
> > But how about this issue of QinQ that we can only support at most 2 VLANs ?  Do you have any ideas?
> 
> I was not NACKing the idea. Just wanted everyone to understand the
> implications of increasing the VLAN field size.
> 
> I tried playing with the fields, but didn't come with a reasonable way
> to rearrange them to make room for the extra VLANs.
> 
> I'm curious what you're use case is for triple VLAN. I wonder if VXLAN
> or PBB (802.1ah) is a better solution.

I'd also like to know what datapath we're talking about.  The Linux
kernel datapath only supports 2 VLANs in any case.