Alan,
Can you please explain what is the problem with linux working in trunk mode?
What security problem are you talking about?

Thanks
Offer Baruch
On Apr 22, 2016 8:00 AM, "Alan Altmark" <alan_altm...@us.ibm.com> wrote:

> On Friday, 04/22/2016 at 02:41 GMT, Grzegorz Powiedziuk
> <gpowiedz...@gmail.com> wrote:
> >
> > 3. Less common, useful in some cases - OSA is plugged into "trunk" port
> on
> > real switch and in general same as (2). But, when you do grant, you can
> say
> > that this specific grant should act as "porttype trunk" (and you specify
> > which vlans are trunked)  so VSWITCH instead of removing the vlan tag,
> > forwards the whole thing to linux guest. So linux guest should be
> > configured to receive and send tagged frames.  As Mark mentioned, during
> > install process it might be troublesome.
>
> Please don't do this.  Instead, use a PORTBASED VSWITCH so that you can
> two vNICs, each assigned to a different VLAN on the same VSWITCH.
>
> Except for a VSWITCH sniffer, there's no longer any need for Linux to be
> VLAN-aware when running as a guest.
>
> Alan Altmark
>
> Senior Managing z/VM and Linux Consultant
> Lab Services System z Delivery Practice
> IBM Systems & Technology Group
> ibm.com/systems/services/labservices
> office: 607.429.3323
> mobile; 607.321.7556
> alan_altm...@us.ibm.com
> IBM Endicott
>
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